1: RE: Jeff Korneff Amplifier - Idea First Appeared There......... (9.47)
Posted by Oldbean2 on 2022-10-05, 14:57:32 (50.237.249.54)
it's on the diyaudio site, in the below thread there are a lot of nice sounding 45 amp schematics out there. I think I built a version of the 'Bugle' from Sound Practices back in the day (it's in the .......

2: Hmmmm (9.47)
Posted by Soundmind on 2005-08-26, 20:55:07 (24.149.197.165)
Of course all that would (or at least should) happen is that the circuit breaker would trip. I see the problem. I'll have to consult with some contractor and code official friends to get their take on .......

3: Re: Just purchased a Variac. Did I get the right one? (8.19)
Posted by Kevin Hayes on 2001-01-14, 08:22:58 (209.214.160.184)
Every VAC Renaissance 30/30 manufactured since the spring of 1995 contains a circuit called the 300B Sentry. One of the functions of this circuit is to delay the application of high voltage for 45 sec .......

4: RE: progress in thinking.... (7.44)
Posted by Matts_ on 2011-07-03, 09:19:35 (66.32.201.202)
how do you know the SET had a lot of distortion? Most do, but only when they're driven beyond a certain point. How do you know it was past that point? Also, the tubes commonly used in SET, 45,2A3, a .......

5: RE: Don't those amps get pretty hot with so little vertical space? nt (7.20)
Posted by kitch29 on 2016-01-30, 14:42:36 (97.82.220.193)
Not at all. The maple surface above the Simple SE (black case) just gets warm and of course the 45 tubes give off very little heat. Both are mostly just parked there though, even the 45 which was my r .......

6: Do you really think a 3 tube preamplifier for $10,000 constitutes "higher value?" (7.13)
Posted by Soundmind on 2006-02-18, 10:08:41 (24.149.197.165)
Especially when a 10 year old electronics hobbyist could have built the same audio circuit out of a tube manual for well under $100 45 years ago? Of course there is the fancy case it comes in...but al .......

7: Re: batterty power supply and tubes (7.10)
Posted by SPARKS 1st on 2005-02-04, 01:48:08 (70.23.207.206)
I remember seeing a low voltage battery operated 12ax7 circuit and I think the plate voltage was 45 volts. I wish I could tell you more about it. As for the heaters, you could just use the 12 volts ri .......

8: THAT'S IT!!!! (6.95)
Posted by jazztrumpet on 2002-07-24, 09:54:54 (65.65.98.191)
You rock man. For real. So I started unplugging on at a time. My X-PSU runs both the X-LP and X-10D - when I took it out, nothing happened. Hum stayed the same. When I turned the power amp off (plugg .......

9: Re: According to USA Today, 29% of 45-65 age group has hearing problem (6.74)
Posted by Hunt on 2000-06-07, 05:46:26 (131.158.23.146)
Most of the hearing problems referred to were probably simply loss of sensitivity in the highest frequencies. If that were all there were to good audio (extension of the frequency range to 20k), we'd .......

10: Re: it's funny.... (6.62)
Posted by BS64 on 2002-09-19, 09:10:56 (207.239.149.68)
the most menacing presence in my den/listening room are the Aerial Model 8's at 45" tall and 20" deep. They are what catches everyone's eye when they enter the room. The first question is usually "wha .......

11: RE: Yep. Although my mains get into the 40's by themselves... (6.56)
Posted by Dman on 2011-12-23, 14:38:46 (173.238.99.252)
Totally understandable! My mains can get into the mid 50s. Their acoustic roll off (or short circuit, as they are dipoles), combined with a first order 45hz HP, and they get out of the way pretty fast .......

12: Philips DVD 624 (6.52)
Posted by psgary on 2004-03-01, 19:20:45 (4.60.26.63)
Haven't heard the Toshiba, but this Philips was only $45 at Circuit City on a closeout. It sounds better than a Mitsubishi I had for a few days and compare favorably with my Rotel RCD-855. Someone at .......

13: RE: Voltage readings to overheating transistor socket (6.51)
Posted by JURB on 2018-09-30, 22:16:16 (76.241.133.183)
Often the transistor that gets hot is not the root cause of the problem. Your readings seem within reason. The 45 from C - E is because it is an open circuit. From B - E the voltage is due to conduct .......

14: RE: Anybody shut off all low level equipment regularly? (6.46)
Posted by 4season on 2010-11-09, 20:58:20 (184.96.61.78)
If I'm not going to be listening for more than a couple of hours, I'll usually power everything down. When I have a new component, I may experiment with leaving it on for a number of days so I hear ho .......

15: RE: Can I use a Kill-A-Watt or multimeter? (6.09)
Posted by jea48 on 2011-11-22, 19:59:54 (173.27.178.148)
In Reply to: Testing ground posted by ggking7 on November 22, 2011 at 08:45:13: Actually Alpha Al's test would be a real world test. A digital meter set on continuity may say the ground continuity c .......

16: Re: ? for the C-J guru's (6.04)
Posted by Mick Wolfe on 1999-04-24, 07:31:23 (152.163.207.186)
I owned an MV 50 for about 4 yrs. It had one of the sweetest midranges I've ever heard ( in my system ) It was also surprising strong for a 45 watter. I remember comparing it to a Cary SLA 70B Sig. No .......

17: RE: What was the "high-end" in 1983? (5.99)
Posted by amioutaline? on 2013-09-26, 16:07:12 (96.37.28.107)
I chose 1983 because it was just before TAS and Stereophile began to reach a wider audience. There was Mark Levinson, Counterpoint and CAT; Cotter, Lynn and Sumiko; Infinity, Acoustat, and B&W; Straig .......

18: Re: Comments on the Pinnacle Baby Boomer Subwoofer please? (5.81)
Posted by phenderson on 2000-12-31, 14:15:57 (12.5.51.245)
on general principle: if it's ported it sucks if it's vented it sucks if it has a passive radiator it sucks if it lacks a low-level input it sucks suggest sunfire junior at 895 for some real no nonsen .......

19: Re: Anyone familiar with Bedini or Counterpoint amps ? (5.75)
Posted by Steve on 1999-03-11, 04:48:06 (209.51.206.55)
I used to own a Bedini 100/00 Diode Emitter amp. I am not familiar with the 250, but have seen several used at Stereo Exchange's web site. I believe that all Bedinis were based on the same general cir .......

20: When AC demagnetizers first appeared (5.62)
Posted by unclestu52 on 2006-03-06, 17:11:31 (63.16.22.161)
5 or six years ago, things like the Gryphon Exorcist, and such, they claimed to demagnetize the circuit. The Exorcist just emitted a 1kHZ toneburst with a 30 to 45 second decay. and they claimed this .......

21: Re: First... (5.58)
Posted by Mr. Walker on 1999-12-29, 18:20:05 (63.10.73.34)
At last, someone who’s actually heard all these amps. I’m interested because I’ve got a pair of Avantgarde Duos due to arrive in London on January 5th, and most of these amps are on my shortlist. (Odd .......

22: Re: To put together a SET amp! (5.48)
Posted by SETdude on 2002-12-31, 14:40:04 (63.184.192.75)
Mike, I would take a good look at the new offerings from Ron Welborne. I have the 'discontinued' Laurels and they are excellent. One of my Laurels is off to Ron for a repair, my fault. My sister heard .......

23: Re: You think?! (5.27)
Posted by Ed Sawyer on 2002-12-04, 13:03:54 (24.62.249.250)
>>Knew that :-) Figured as much... ;-> Yes, the description is pretty much on the money. 816's could sub for the 866's (original plan was to have interchangable cap leads but didnt'work out that way) .......

24: I did, but in an unorthodox way...... (5.22)
Posted by Chris Garrett on 2001-04-05, 15:52:10 (205.188.208.198)
I actually purchased my system without listening to any of the pieces first and only saw pictures from the various websites. This being said, I got my speakers, preamp, amps, DAC, line conditioner and .......

25: Re: Help out a newbie with some sound advice. (4.88)
Posted by bondmanp on 2003-03-17, 09:08:16 (12.33.123.19)
The good news is that the Vandy's don't need a lot of wattage in an average sized room, so you can look at modestly priced integrated amps and still get plenty of dynamic impact from your speakers. Ch .......

26: Re: Tubes (4.83)
Posted by steven oda on 2002-08-04, 15:45:13 (24.205.20.241)
Met, So this boy is an amp, as well as a reverb tank and tremolo? Or what are the Mullard EL84 power tubes being used for? Does it use a Accutronics spring tank? Sounds like a 30 watt head unit. With .......

27: Re: How not to run a HiFi store...(long story) (4.68)
Posted by Dave Duvall on 2002-02-18, 17:02:57 (216.228.4.130)
posted by Joe M.: >>This is justified by our need to make a commision.The name of the game is move the customer along (an actual paying person) no time to engage in non productive communications to wh .......

28: Re: How were the two "top" cables selected? (4.50)
Posted by Jon Risch on 1999-04-20, 19:06:21 (207.3.84.47)
I also tend to disagree with the author of the original article (Mr. Hayward), for many reasons, not the least of which are that he latches onto one single measurement factor as the ultimate metric, r .......

29: here's one: odd ordered harmonic distortion (4.23)
Posted by Ralph on 2014-07-29, 09:23:06 (64.122.72.31)
The human ear/brain system is very sensitive to higher ordered harmonics (5th and above), particularly the odd orders. If these harmonics appear as the result of distortion of the signal, the result t .......

30: Re: What % of the MSRP goes to Advertising / Marketing ? (4.08)
Posted by All_Mod_Cons on 2001-05-09, 18:36:26 (131.107.3.74)
it depends on the product and the brand power of the company and their products. e.g., is the product new and unknown ? is the company new ? do they have distribution ? and if you are talking hardware .......

31: Hey, I've got an idea... (4.02)
Posted by nickwh on 2003-12-06, 09:47:57 (68.193.144.77)
Stop treating younger people like sh*t. Generally, my experience in retail hi-end stores has been "what are you doing here?" I'm 26 years old and I make a decent living for my age. However, my money i .......

32: Great review...I own them as well....my experiences are similar. (3.93)
Posted by DN on 2002-04-07, 13:05:41 (208.59.181.67)
Great review and quite consistent with my experience, although I am not as far along as you. I bought mine last year, also at a similar price -- so good I could not turn it down -- but mine are in bla .......

33: What I've learned in audio after the last $100,000 down the sink hole. (3.83)
Posted by pctower on 2002-05-11, 16:04:44 (64.105.65.251)
Vinyl vs. digital; Julian Hirsch vs. Harry Pearson; redbook vs. SACD vs. DVD-A; monitors vs. full-range; magazine reviews vs forum reviews; MC vs MM; shielded vs. unshielded; linear vs. tangent; stock .......

34: Re: Best Home Theater speaker system... for UNDER $600 (3.58)
Posted by ScottFW on 2000-09-28, 21:11:41 (128.249.124.73)
I have heard the Energy Take 5 as well as the Infinity HTS-20 and one JBL setup (don't remember which) and the Energy's clearly were the better system, especially for music. As somebody else pointed o .......

35: Re: How do you "explain" your audio insanity to visitors or don't you even try? (3.54)
Posted by Jon T on 2001-11-09, 16:53:42 (128.32.131.44)
John, I'm a committed audio nut, but when I first saw the photo of your system I thought you were off your rocker, too... ;) Anyway, usually I just explain that it's an expensive hobby that brings me .......

36: Can't help you chief.... (3.37)
Posted by Sean on 2002-12-28, 16:58:20 (12.247.129.90)
All i can say is that you've got pretty solid gear and should be able to hear differences amongst cables. If you can't hear the differences amongst cables, "something" is not right. On one occasion w .......

37: REVIEW: Tube Audio Lab WE91 300B Monoblocks Amplifier (Tube) (3.25)
Posted by Paul Folbrecht on 2009-02-12, 09:55:28 (12.168.47.9)
Model: WE91 300B Monoblocks Category: Amplifier (Tube) Suggested Retail Price: $2500 Description: Custom-made WE91 monos, 6C6 driver, Manufacturer URL: Tube Audio Lab Model Picture: View .......

38: Poor connections create diode-like effects... (3.24)
Posted by Sean on 2005-07-05, 15:50:38 (24.14.157.234)
which can also act as both an antenna and audio rectification circuit. This is why i stressed CLEAN connections that are properly maintained. Other than that, what you're are describing is a high VSW .......

39: Re: I doubt very much... (3.12)
Posted by Jon T on 2001-02-16, 18:17:35 (63.193.119.143)
I think that this is a bit of an exaggeration. There is a lot of marketing BS surrounding class A, but I wouldn't call it lying. The important thing to remember is that there is not much difference be .......

40: Re: What I've learned in audio after the last $100,000 down the sink hole. (3.06)
Posted by gonefishin on 2002-05-11, 16:38:37 (12.251.50.145)
Vinyl vs. digital; both Julian Hirsch vs. Harry Pearson; both redbook vs. SACD vs. DVD-A; waiting to see monitors vs. full-range; depends on application...but full range if you can do it well magazin .......

41: John Curl: with respect, but you pissed this musician off (long) (2.90)
Posted by Rick W on 2002-07-30, 12:22:59 (66.108.29.166)
Your reply to my post on the "improve your cd's for pennies" thread below is unfortunately typical of the thinking of many in the hi-end community regarding musicians' crappy sound systems. Its true t .......

42: Re: Vacuum Tube Logic - VTL TT-25 Amplifier (Tube) (2.87)
Posted by Keith on 2000-03-29, 09:16:10 (128.59.117.197)
Hi Vinylly, Great review. I have a few questions for you though: 1) When did you get these? You do know that there were quite a lot of changes from the former Tiny Triodes (made in 92?) to the newer L .......

43: When does a better mouse trap turn distasteful carboncopy cloning? (2.73)
Posted by Srajan Ebaen (R) on 2003-07-08, 08:59:14 (65.121.117.135)
Just a day ago, we published a review of the Audio Zone AMP-1 on 6moons. I knew going in that the design was closely based on the 47Lab GainCard which has inspired a small underground GainClone cultur .......

44: Re: Tubes or Solid State? (2.68)
Posted by Bruce from DC on 1999-10-29, 06:56:21 (207.91.86.2)
My very first stereo (in 1969) was a tube rig. Dyna PAS-3 preamp and Stereo 70 power amp. The latter has become a cult item and now sells for more than it did new. I now have a Krell KAV-300i integrat .......

45: REVIEW: PrimaLuna ProLogue Seven Amplifier (Tube) (2.47)
Posted by charlie@cunninghamparris.com on 2008-03-03, 15:17:38 (206.72.80.59)
Model: ProLogue Seven Category: Amplifier (Tube) Suggested Retail Price: $3,149 Description: Monobloc PAIR of power amps equipped with Adaptive AutoBias™ exclusive to PrimaLuna, means no use .......

46: This story is so common its scary. Read my story within (even more unbelievable). (2.42)
Posted by Hashim on 2000-07-20, 07:03:54 (206.142.54.55)
I recently have been looking to purchase new speakers. I am a third year law student who is working in New York City this summer, so I thought this would be a great opportunity to listen to a wide arr .......

47: Re: How do you measure connoiseurship? (2.41)
Posted by e-stat on 2001-02-22, 19:48:21 (24.31.114.24)
One point I was trying to make is that many coveted "reference" recordings are not very good, and in order to serve the subjective, sentimental expectations of an enthusiast using such recordings, it .......

48: RE: This sure ain't your dad's old console! (2.41)
Posted by JURB on 2018-08-25, 13:21:11 (76.241.138.18)
Since people are bringing up other consoles I guess I'll have to put my 2 cents in. Not in order. A Penncrest, OTL solid state, maybe 12 WPC. Ripped out the loudness comp and modified the bass control .......

49: REVIEW: Pioneer SX-780 Receiver (2.39)
Posted by FRG7SWL on 2004-07-25, 16:08:22 (152.163.253.34)
Model: SX-780 Category: Receiver Suggested Retail Price: $unknown Description: Classy, analog 70's receiver with great sound and good reserves Manufacturer URL: Pioneer Manufacturer UR .......

50: RE: The "Mod" industry. (2.30)
Posted by thetubeguy1954 on 2008-11-05, 12:46:58 (68.18.33.250)
Hello Merle! BEFORE asking why people mod their equipment one has to answer the question of whether or not they believe the quality of the caps, inductors, resistors have an audible affect on the so .......

51: Why not, eh? (2.15)
Posted by Timbo in Oz on 2008-10-28, 21:02:57 (203.129.60.96)
because you could if you wished dig deeper by searching here under my sign-off, let's try to keep this brief. Questions: 1. Describe your personal history with respect to audio equipment. - discovered .......

52: REVIEW: Glass-Ware Aikido Line Stage Kit Preamplifier (Tube) (2.11)
Posted by amioutaline? on 2009-01-23, 19:07:50 (96.36.86.246)
Model: Aikido Line Stage Kit Category: Preamplifier (Tube) Suggested Retail Price: $149.00 Description: Aikido Dual Mono Octal PCBs Manufacturer URL: Glass-Ware Model Picture: View Rev .......

53: REVIEW: Karan Acoustics KI 180 Integrated Amplifier (SS) (2.07)
Posted by jdwaudio on 2002-03-11, 14:45:14 (129.42.208.145)
Model: KI 180 Category: Integrated Amplifier (SS) Suggested Retail Price: $6000 Description: SS Integrated Amplifier - 180 wats per channel Manufacturer URL: Karan Acoustics Model Pic .......

54: REVIEW: NAD S170 Preamplifier (HT) (1.99)
Posted by joeb on 2002-02-28, 15:10:33 (199.89.64.45)
Model: S170 Category: Preamplifier (HT) Suggested Retail Price: $3750 Description: 7.1 a/v processor preamp Manufacturer URL: NAD Model Picture: View Review by joeb ( A ) on Fe .......

55: REVIEW: Escalante Design Juniper Speakers (1.95)
Posted by jonbee on 2012-09-30, 19:19:04 (98.225.22.34)
Model: Juniper Category: Speakers Suggested Retail Price: $7000 Description: 2+ way standmount Manufacturer URL: Escalante Design Model Picture: View Review by jonbee on September 30 .......

56: RE: Moderator/Buddy Circle Censorship?? (1.95)
Posted by The Bored on 2010-03-05, 17:55:51 (71.94.221.238)
>> I speak from my own experience, where all my posts have been removed. Bull. A quick search shows many posts from you: Found 12 records in General Asylum. 1: RE: Moderator/Buddy Circle Censorship?? .......

57: REVIEW: JWN Amplifiers Push-Pull 6AQ5 Amplifier (Tube) (1.91)
Posted by vman71 on 2009-11-24, 04:20:26 (65.222.202.204)
Model: Push-Pull 6AQ5 Category: Amplifier (Tube) Suggested Retail Price: $800 Description: Custom 2ch PP tube & headphone amp Manufacturer URL: JWN Amplifiers Review by vman71 on Novem .......

58: Audio Store Wish List (long) (1.88)
Posted by Jon T on 2001-08-01, 20:42:01 (133.11.65.213)
I think the key thing is to carry gear that you've heard and you like, and then stick with it long haul. There is nothing more annoying than buying a product you enjoy, then going back in a year or tw .......

59: Re: John Dunlavy on speaker wire (1.84)
Posted by Jon Risch on 1999-06-08, 18:55:23 (209.215.72.239)
For Mr. Dunlavy to make such statements, and turn around and take your money for his own special cables, ones that claim to {all quotes from Dunlavy web site are in brackets}: [ It is a cable with a d .......

60: Audio Timeline -- Enjoy! (1.64)
Posted by Mike Bates on 2001-10-16, 22:31:48 (205.158.182.148)
I found this at the AES Historical society website. Neat site! Check it out at ----- http://recordist.com/aeshc/ AN AUDIO TIMELINE V--1999-10-17 A selection of significant events, inventions, products .......

61: 500 watt BICYCLE "steet party" trailer system with a JBL 15" sub (1.53)
Posted by thump on 2016-11-05, 01:17:01 (68.227.253.158)
i am in the process of building a bicycle trailer street party system to combat the lousy gangsta rap/banda only scene here playing funkier and more upbeat funk, old school (REAL as in positive) hi .......

62: REVIEW: nOhr Le Amp Amplifier (SS) (1.44)
Posted by dljacob@uswest.net on 2001-11-21, 23:50:23 (216.160.128.227)
Model: Le Amp Category: Amplifier (SS) Suggested Retail Price: $500pr Description: 100W/ch monoblocks Manufacturer URL: Not Available Manufacturer URL: Not Available Review by d .......

63: Re: Yikes, and I thought I had A.D.D. ;-) (1.27)
Posted by Joe Rosen on 2001-06-08, 15:22:58 (64.12.105.31)
Aurelio: When I said the technology "died" in 1991/2 I meant in CD players, not garbage toys made with the usual crummy Philips parts (Rotel, NAD, maybe even Arcam). And therefore I meant the "best" C .......

64: REVIEW: TDS - True Dimensional Sound Passive Audiophile Other Review by Steve at Audio Asylum (1.23)
Posted by Steve on 1999-10-08, 14:36:16 (207.222.4.223)
I recently purchased a TDS unit. I auditioned the unit at Custom Audio Creations in Mobile, Al. It was the unit with the switch and was installed between a Marantz CD player with adjustable output and .......

65: REVIEW: Spectron Musician II Amplifier (SS) (1.13)
Posted by robert_krist@yahoo.com on 2002-06-27, 09:52:51 (68.11.68.68)
Model: Musician II Category: Amplifier (SS) Suggested Retail Price: $3,495 Description: Class D digital amp 500Wpc Manufacturer URL: Spectron Model Picture: View Review by rober .......

66: REVIEW: McCormack MAP-1 Preamplifier (SS) (0.89)
Posted by author@escapeclause.net on 2008-05-21, 10:04:36 (68.214.97.45)
Model: MAP-1 Category: Preamplifier (SS) Suggested Retail Price: $2995 Description: six-channel analogue preamp Manufacturer URL: McCormack Review by author@escapeclause.net on May 21, .......

Found 71 records in Amp/Preamp Asylum.

1: Re: I'm looking at a 4a now. (7.82)
Posted by Attilia Wolf at Juno on 2003-07-06, 09:28:31 (67.30.38.209)
I have two Forte model 4 and the preamplifier model 45, same as the 44 without remote. The one I purchased with the 45 might be called a 4a, I never really looked, but it is the newer of the two. Anyw .......

2: Preamps (7.82)
Posted by Frihed89 on 2018-04-05, 09:58:32 (2.108.1.16)
I have been using a deHavilland UV3 for years with my Fi 2A3 monos. I actually use it as a 45 amp more than a 2A3 amp. I have tried numerous rectifiers with the 45, and the Bendix 6106 is the nicest s .......

3: Question ............. (7.79)
Posted by Cut-Throat on 2023-01-29, 12:22:56 (69.80.12.217)
I like yourself, hate hum, hiss any background noise at all. Can you hear noise (hiss, hum) at your listening position? -- Maybe 10-12 feet away? The reason I ask, is that I have 115db Oris Horns with .......

4: Re: Any listening comparisons between the XR50 ? (7.66)
Posted by Wayne1 on 2004-12-09, 10:04:44 (67.165.221.85)
I do not have any other Panasonic receivers on hand, at this point. I should be getting an XR-50 and a XR-45 in for mods in a week or so. If I have the time, I will try to compare. The XR-70 uses the .......

5: RE: TS KT-150 (7.20)
Posted by FSonicSmith on 2017-11-30, 18:11:56 (99.34.125.203)
Mike Sanders has recommended 45, that's only 5ma more than what I ran with the kt88s. It appears that we once again need to establish that in a bias circuit, lowering the bias will red-plate the tube .......

6: Re: ICEpower500ASP Current Specifications (7.17)
Posted by DevillEars on 2007-04-29, 07:22:21 (196.25.255.195)
Hi Beppe, The source of the specifications was B&O's ICEpower website and a downloaded product datasheet for this module. I mistakenly added the word "continuous" - this is incorrect usage, as the 35 .......

7: RE: Breaking my rule of not commenting on gear I've never heard (6.92)
Posted by B. Scarpia on 2021-02-05, 12:31:31 (97.82.221.142)
I have heard, lived with, the first Yamamoto to hit these shores, the 45 stereo amp. It was a revelation after years of listening to all sorts of single-ended amps, 45, 300b, 2A3, and more. There was .......

8: RE: Thoughs on Shiny Eyes or other DHT pre's? (6.82)
Posted by airtime on 2020-03-27, 07:35:37 (24.251.225.215)
Korneff 45, I always wanted to hear one of those! They're like a cult. Anyway, I also looked at the Shinny eye's. That is one overly complex preamp. This is coming from tube amp experience, but when y .......

9: RE: Tube Pre + SS Amp Without Standby Users: Keep amp and source on 24/7? (6.67)
Posted by neolith on 2012-11-04, 15:09:54 (24.125.205.20)
I leave my amps on all the time and usually (but not always) turn off the tubed pre. The preamp has a mute circuit that activates before turn off and there is a delay of about 45 seconds with turn on .......

10: RE: Audio Research D-76 - advice on biasing (6.61)
Posted by Dman on 2010-01-25, 14:44:00 (24.226.122.227)
As an owner/refurbisher of an ARC D-76a, they are a slightly similar in procedure to the older D-76. Do you have a D-76 or D-76a? Just checking! In either case, the biasing is relatively simple- the 1 .......

11: Audio Research SP-10 sudden mute ?? (6.50)
Posted by Ross on 2016-12-19, 13:56:11 (172.9.116.164)
I have an ARC SP-10 that seems to have a problem. After about 45-50min of playing, the signal suddenly cuts off. All sources. I am left with a faint hum, that disappears when I flip the mute/operate .......

12: Re: HELP!!! What is wrong? (6.45)
Posted by Bold Eagle on 2005-01-25, 13:28:35 (69.40.219.56)
Dan, I just got around to checking my Adcom GTP-350 tuner preamp. Sure enough, the right channel was about 1.5 dB stronger than the left. The balance pot shaft had fine splines, so I pulled it off, se .......

13: Re: You are getting rid of electrical fields! (5.93)
Posted by Vinylrube-esque on 2004-01-26, 19:30:23 (68.90.72.243)
My HDTV had a waxy sheen to the picture until one day I unplugged it from the cheap Rat Shack surge protector and went straight into the wall. Cleared up immensely. I built a little DIY powerbox that .......

14: so it seems (5.88)
Posted by 2chJunkie on 2011-07-01, 18:00:40 (209.103.248.32)
Thanks man. I hope I made a good decision. Seems so thus far. This pot is great. BTW thats some great work you did on the 45 amp! Breathtaking. I wish I had your confidence to go DIY already. Im sure .......

15: Driving 801's w/o Woofer Zobel 3.4 ohms, No Problem (5.78)
Posted by ka7niq on 2004-01-03, 05:54:34 (4.3.101.193)
I havent yet turned the fan on, except when I accidentally switched to surround w/o surround speakers connected. The little Panny turned on its fan to protect itself. You need to get you one of these .......

16: Re: Panasonic SAXR25/45 - my last words on the subject... (5.64)
Posted by jb0194 on 2004-01-06, 08:35:34 (67.161.208.200)
Always glad to read posts from someone who is really impressed with a piece of gear (SHILLS notwithstanding!). While the panny is not my cup of tea, you may be right in contending that it heralds anot .......

17: Re: Spectron Digital in (5.63)
Posted by ka7niq on 2004-04-05, 07:24:54 (4.41.4.107)
Oh, thats right, and you would lose ED's Jitter circuit. I just love my Museatex DAC, but since I am currenty playing with the Panasonic SA XR 45, I dont use it. I am digital all the way. I just neede .......

18: RE: 300b tube preamps? (5.63)
Posted by coolhand on 2010-11-17, 17:44:29 (136.186.35.102)
I think that you may be inclined to enquire about DHT tubes in regards to their apparent effect on sound stage presence or moreso the general 'gestalt' such tubes seem to manifest when employed etc... .......

19: "The only way to know for sure is to take the caps out and test them" (5.35)
Posted by 1973shovel on 2018-10-06, 06:40:24 (96.37.198.203)
Actually, capacitors can be tested for ESR (link below) in-circuit, using an ESR meter. I agree that old electrolytic caps should be replaced, but I do have a Marantz tuner with 45 year old electroly .......

20: RE: "While not perfect, it is still better then anything else available" seems you forgot to add IMHO...nt (5.21)
Posted by hahax@verizon.net on 2015-09-19, 12:15:35 (96.234.41.97)
You are correct about the tube but not the circuit. And some triodes are more linear than others. The fabled 300B is just very good. The 2A3 is more linear and I'm told the 45 more linear yet. The pro .......

21: thanks Glen - here's where i'm at. (5.13)
Posted by centaurus3200 on 2011-03-10, 11:24:07 (70.143.2.130)
thanks glen, how do you adjust the gain with the MC phono stage? i don't think adding capacitors in the receptacles does much with MC. adding resistors won't affect the hum. what did you get from the .......

22: Re: Question for Hybrid Amp Owners (5.02)
Posted by JuicyMusic on 2007-02-22, 09:35:14 (70.101.210.27)
I've taken many temperature measurements on preamps and amplifiers (tubed). In general, a completely stable operating temperature of all components is reached at about 45 minutes - give or take. This .......

23: RE: Thanks for all the thoughtful replies (5.00)
Posted by kh6idf on 2019-11-12, 16:59:14 (73.55.242.205)
I recapped my Linn LK280 earlier this year. It has two large filter caps per channel and I think 6 smaller electrolytics per channel. Cost of parts was around $45. I used the same brand as original (U .......

24: Many people have more than one 15 amp circuit in thier place of residence!!!! (4.96)
Posted by Elizabeth on 2011-06-22, 20:26:21 (65.28.186.225)
Anyone in a place bigger than an efficiency one room apt has more than one breaker circuit ALREADY in thier place of residence. I live in an average one bedroom apt and have TEN breakers total in my a .......

25: Re: I owned a Shinsheng/Pacific Valve KT88 (4.83)
Posted by seasterl on 2006-09-25, 15:01:18 (70.121.129.72)
I wonder why no one has heard of Pacific Creek SE300i 300B-based SET integrated amp. It seems to have stellar specs (on paper) with what appears to be good built quality, and at a price that invites a .......

26: RE: that's correct -- it's the "SE" not the "T"... (4.73)
Posted by mgbpuff on 2025-05-17, 09:05:46 (47.39.157.48)
Congrats on a nice Nelson Pass build of a solid-state SE amp. I have an original First Watt F1 amp signed by Nelson himself. Solid state devices are not as linear as tubes in general, so a feedback ci .......

27: Re: I just bought a Panasonic XR-45 for a hundred bucks. (4.64)
Posted by pmburnett on 2004-07-18, 19:44:54 (12.223.40.86)
Glad to hear it! I just purchased an XR-50 and my jaw dropped when I hooked it up. This convinced me to take a little trip down to Circuit City where they happened to have a Harman Kardon DPR1001 on c .......

28: RE: 4 ohm 2A3 SET, any good suggestion? (4.32)
Posted by Rick58 on 2010-07-20, 16:57:53 (99.38.183.25)
Bottlehead Paramount 2A3 should work great. http://www.bottlehead.com/store.php?crn=44&rn=434&action=show_detail I use these in 300B configuration (~8W) driving 90dB Triangle Titus monitors. If there' .......

29: Ground loop/power conditioner question (4.30)
Posted by 70chevelle on 2008-03-28, 06:19:07 (65.116.16.162)
Ok, I'm coming to the end (or just beginning?) of my audio obsession. I've progressed over the past year from building a home theater with existing components to new components and speakers, to a smal .......

30: How hot is hot? (4.20)
Posted by mlsstl on 2023-07-10, 06:19:59 (70.135.149.73)
Lots of electronics run "hot" and last ages. For example, computer CPUs run 45 to 50 degrees C (113 to 122 F) at idle, and run up to 80 C (176 F) under heavy load. Those temps are hot to burning to th .......

31: RE: Why Choose Solid State? (4.17)
Posted by 4season on 2013-11-07, 11:58:25 (204.131.179.187)
I used to think tubes had a certain essential magic that helped me to connect with my music better. But it turned out I really just needed better speakers ;-) Solid state (including printed circuit bo .......

32: Re: Careful, do yourself a favor (4.15)
Posted by Russ57 on 2003-03-12, 06:04:16 (209.42.40.139)
If you have had to settle for those types of solid state products, which I assume has something to do with money, then buy vintage for a tube amp. Unless you get into a pretty costly amp newer tube am .......

33: Re: Question for Hybrid Amp Owners (4.11)
Posted by Bruce from DC on 2007-02-22, 10:35:45 (207.91.86.2)
Can't speak to those products. However, my experience with both an all solid-state integrated amp (Krell KAV-300i) and an all-tube (11 of 'em!) phono stage (BAT VK-P5)is that both required about 15 mi .......

34: :-) (4.10)
Posted by bare on 2017-05-09, 14:41:09 (50.92.36.159)
Yes it replaced a Pre amp a George Wright triode affair that I've owned and loved since mid 90s. It wouldn't work (sounded Bloody Awfull tbh) with my New Firstwatt amp Not that it wasn't good.. it si .......

35: Re: Tell me more about this Panasonic, please.... (3.99)
Posted by ka7niq on 2004-01-03, 06:08:30 (4.3.101.193)
The Panasonoic we are talking about is the Sa xr 45, availiable at JandR music world for 299 dollars. From one ham to another, just buy it Om, or go get the Sa XR 25 from Circuit City, and you get a 3 .......

36: RE: Those are nice ! ....................As are those! (3.97)
Posted by B. Scarpia on 2020-01-17, 10:15:55 (97.82.221.142)
The EF-86 input tube is a large determinant of the sound, as well as gain. We decided to lower the gain, especially as we went without NFB, by wiring the EF-86 in Triode. We also went from 6DJ8 in the .......

37: Must also consider (low) impedances and (severe) phase angle (3.89)
Posted by Brian H P on 2020-10-07, 12:45:01 (63.155.29.170)
Particularly in the bass. Highly sensitive speakers can still require LOTS of current from the amp, even if they don't need much voltage to put out high SPLs. First-order crossovers, with the minimum .......

38: itching for something better than my B&K MC-101? (3.70)
Posted by centaurus3200 on 2011-03-09, 22:30:52 (69.228.91.96)
hi all, it's been quite a while since i've posted here. i've largely been very happy with my system (see my profile for current rig). so much so that i haven't tweaked it for a while. i still LOVE the .......

39: 'Designer Amps: Don Garber, Sam Kim and Don Allen (3.56)
Posted by amarok on 2007-06-27, 02:13:55 (71.226.119.96)
I own a Sam Kim reworked EL84 based Heathkit 151 integrated amplifier. It is wired in triode mode, and apparently the circuit has been completely re-done. It sounds fabulous. I alternate playing it wi .......

40: Tubes dont show their ass in audio like... (3.44)
Posted by ka7niq on 2004-01-02, 19:05:45 (4.3.101.193)
they do in ham radio. As the frequency is increased, circuit design becomes more and more critical. Audio Frequencies are way below RF frequencies, and so tubes can be very good indeed. Several of my .......

41: REVIEW: H2 Generator by Nelson Pass (3.37)
Posted by amandarae on 2022-03-21, 13:26:47 (104.172.37.145)
From my observations, there are many Solid State amps that excels on both life-like, detailed, tube-like sound output. Measuring such amps with a soundcard and REW (Room Equalization Wizard) to projec .......

42: Sadly, there is really no definitive answer to your question. (3.34)
Posted by jsm on 2007-07-27, 11:18:56 (128.114.22.181)
The fundamental reason is simple. Which tubes sound best can depend a lot on the specific circuit involved. The second reason is also important. Different tubes will sound different, but it can be a m .......

43: The tubes will have the same life hours- but compressed into substantially less months! (3.32)
Posted by Bambi B on 2010-03-12, 07:29:50 (24.24.190.30)
magicsam, In my view, running tube gear all the time creates a sense of the meter running all the time. Tubes have a finite life- often far more than their rating, but nonetheless, 24 hours a day is, .......

44: Halo JC-1 part 2 (3.25)
Posted by audioengr on 2003-05-26, 12:24:05 (206.163.168.13)
The monoblocks are full broken-in now and I am in my new location, with a much larger room to audition them. I installed a single dedicated 20-amp circuit for all of the grounded equipment using 10-ga .......

45: Re: Anybody thermal their Sonic Impact T-Amp yet? (pic) (3.23)
Posted by BFitz on 2005-06-19, 09:25:12 (24.194.6.158)
See the TA2024 data sheet, relevent part from page 9 below. It appears that if your problem was overcurrent, cycling power would bring it back immediately. Likely it is overtemperature, as you say it .......

46: Adcom GTP-450, Part 1 (2.79)
Posted by Luminator on 2023-02-16, 18:21:37 (162.205.183.92)
"I hate you, Lummy," writes an audiophile now living in Henderson, NV. "You never invite us [audiophiles] over. Your friends not only got to play with all your stereo gear, they just seem for decades .......

47: Re: Questions and points to consider... (2.77)
Posted by J North on 2004-01-04, 10:04:06 (209.121.200.65)
Yes, my "conclusions" apply only to the XR45 I had. It gave similar results in two different systems so the results apply to only these two particular systems & setups. Speakers were not moved between .......

48: REVIEW: Tube Audio Design TAD 1000 Amplifier (Tube) (2.65)
Posted by raindances on 2009-12-26, 06:45:14 (65.13.157.204)
Model: TAD 1000 Category: Amplifier (Tube) Suggested Retail Price: $2600. pr. Description: 100 watt per channel all tube mono block amplifiers Manufacturer URL: Tube Audio Design Review .......

49: RE: Modulus 3/3A Question (2.56)
Posted by Tantalus on 2009-10-13, 23:17:44 (71.212.238.181)
I've had an AI Mod. 3 for three years. I can't speak to the differences with the Mod. 3A, since I've never owned one, but my understanding is that there is a lot that has been changed, and that the ba .......

50: RE: KRELL VANGAURD COMING!! (2.50)
Posted by thebordas on 2014-07-12, 09:05:47 (71.185.77.163)
Full Class A output with new iBias, illusion preamp design and made in USA! The website will be updated soon. I've owned stuff from every series of Krell since the mid 90's and nothing is more revolut .......

51: Solid state amps are supposed to be constant voltage devices (2.43)
Posted by Russ57 on 2007-07-22, 13:42:31 (209.214.21.85)
Here is a cut & paste that describes things....easier than me typing....and I'll include another link below. "Being Load Impervious is not exactly what it sounds like! It is called load impervious as .......

52: RE: Welcome to snob audio! Sorry, your, sniff sniff, Rotel, is just not "High End"... (2.32)
Posted by A.Wayne on 2015-02-09, 17:15:06 (98.64.128.94)
Cab , Wait , let me see if i can follow you , are you saying this "For basic specs, the VA350i offers four inputs; one rec out; remote source, volume and stand-by switching; and, at 3% THD, 30 watts i .......

53: Added Info for XR25\45 buyers! (2.30)
Posted by NEAR SOTA on 2003-11-06, 03:29:12 (172.133.148.182)
For those doing a search on the XR25\45 I shall keep adding here incase people do a search for this unit! The Following was taken from the following thread!I wish he would have tried switching out PC' .......

54: Re: Impressions of New AVA - 'R' upgrades to Amp, Preamp and DAC..... (2.24)
Posted by Cut-Throat on 2003-11-29, 13:38:28 (205.188.208.9)
I recently had my three AVA components upgraded to the newest AVA circuits. That is my Transcendence Seven ECR Pre-amp, Fet-Valve 550 EXR amplifier as well as my Transcendence DAC. I won’t get into t .......

55: ARC LS- 3 : Relentlessly Revealing (2.10)
Posted by Bambi B on 2011-01-16, 06:24:26 (98.148.220.162)
gripweed44, I don't have experience with the Bryston amplifier, but I have had three Audio Research Preamps over 26 years: tubed SP8, SP10, and used the solid state one- an LS3 (1996), with a solid st .......

56: REVIEW: PrimaLuna ProLogue Seven Amplifier (Tube) (2.10)
Posted by charlie@cunninghamparris.com on 2008-03-03, 15:17:38 (206.72.80.59)
Model: ProLogue Seven Category: Amplifier (Tube) Suggested Retail Price: $3,149 Description: Monobloc PAIR of power amps equipped with Adaptive AutoBias™ exclusive to PrimaLuna, means no use .......

57: Re: Mcintosh C2200 / Impressions? / Criticisms? -- Long (2.08)
Posted by goldenthal on 2003-06-21, 10:31:57 (64.230.79.8)
See Sam Tellig's by-line in (gasp) Stereophile some months ago. As I recall, he was smitten by the pre-amp except for the phono stage. He seemed to suggest (I think) that he loved it so much that he'd .......

58: REVIEW: Glass-Ware Aikido Line Stage Kit Preamplifier (Tube) (1.91)
Posted by amioutaline? on 2009-01-23, 19:07:50 (96.36.86.246)
Model: Aikido Line Stage Kit Category: Preamplifier (Tube) Suggested Retail Price: $149.00 Description: Aikido Dual Mono Octal PCBs Manufacturer URL: Glass-Ware Model Picture: View Rev .......

59: REVIEW: Goldmund Goldmund Mimesis 29M-Millennium Edition Power Amplifier Amplifier (SS) (1.80)
Posted by calloway on 2003-05-18, 14:49:28 (208.30.87.58)
Model: Goldmund Mimesis 29M-Millennium Edition Power Amplifier Category: Amplifier (SS) Suggested Retail Price: $18,500 Description: Goldmund Ultimate Line Stereo Power Amplifier Manufac .......

60: Pictures and Review of the Hagerman Clarinet Line Stage (1.70)
Posted by tubesforever on 2008-04-13, 01:02:04 (24.182.50.127)
This review is long and for good reason. I apologize about the length but if you want to know more about how and what goes into a DIY project then this will be worth the time and effort. I decided t .......

61: REVIEW: JWN Amplifiers Push-Pull 6AQ5 Amplifier (Tube) (1.62)
Posted by vman71 on 2009-11-24, 04:20:26 (65.222.202.204)
Model: Push-Pull 6AQ5 Category: Amplifier (Tube) Suggested Retail Price: $800 Description: Custom 2ch PP tube & headphone amp Manufacturer URL: JWN Amplifiers Review by vman71 on Novem .......

62: REVIEW: MAPLE AUDIO OCTAL 6A TRIPLEX (1.61)
Posted by arevz on 2003-07-12, 11:27:19 (198.81.26.9)
Love You MADdly A Review Of The Maple Audio Design (MAD) Octal 6A Triplex Preamp By Abe R. Revilla An audio enthusiast surfing the net with money to spare is dangerous! Stumbling to a web site that o .......

63: REVIEW: Great Northern Sound ARC SP14 Reference Plus Preamplifier (Tube) (1.59)
Posted by the analog kid on 2006-09-06, 17:20:45 (71.206.105.208)
Model: ARC SP14 Reference Plus Category: Preamplifier (Tube) Suggested Retail Price: $2,000 Description: Modified ARC SP14 Tubed Preamplifier with Phono Manufacturer URL: Great Northern .......

64: REVIEW: Hagerman Clarinet Preamplifier (Tube) (1.53)
Posted by tubesforever on 2008-04-13, 01:19:19 (24.182.50.127)
Model: Clarinet Category: Preamplifier (Tube) Suggested Retail Price: $500 stock $1000 as reviewed Description: Clarinet SRPP Line Stage Manufacturer URL: Hagerman Model Picture: View .......

65: REVIEW: Transistor Research Labs ST-225 Amplifier (SS) (1.53)
Posted by Jack Seaton on 2005-08-06, 06:32:16 (4.178.0.9)
Model: ST-225 Category: Amplifier (SS) Suggested Retail Price: $5500 Description: 225 watt/channel integrated Manufacturer URL: Transistor Research Labs Manufacturer URL: Transistor R .......

66: REVIEW: Dodd Audio Reference Grade Preamp Preamplifier (Tube) (1.47)
Posted by ddemeterio5 on 2004-11-29, 01:46:10 (64.136.164.36)
Model: Reference Grade Preamp Category: Preamplifier (Tube) Suggested Retail Price: $2600 Description: Dodd Audio top of the line preamp Manufacturer URL: Dodd Audio Model Picture: Vi .......

67: Review: Audible Illusions M3a Preamplifier (long) (1.28)
Posted by Auditious1 on 2002-09-26, 10:56:17 (198.81.21.172)
I go back almost 20 years with Audible Illusions products, starting with an original Modulus preamp. Now, I suppose, it would be called a Model 1. It assumed duty in my system, sometimes as a dedicate .......

68: REVIEW: Atma-Sphere MP-3 line stage Preamplifier (Tube) (0.85)
Posted by JackWilliams@webtv.net on 2006-09-17, 14:45:44 (71.159.216.10)
Model: MP-3 line stage Category: Preamplifier (Tube) Suggested Retail Price: 3650.00 Description: Fully balanced, single chassis all tube preamp Manufacturer URL: Atma-Sphere Model Pic .......

69: REVIEW: McCormack MAP-1 Preamplifier (SS) (0.75)
Posted by author@escapeclause.net on 2008-05-21, 10:04:36 (68.214.97.45)
Model: MAP-1 Category: Preamplifier (SS) Suggested Retail Price: $2995 Description: six-channel analogue preamp Manufacturer URL: McCormack Review by author@escapeclause.net on May 21, .......

70: REVIEW: HOLFI Power 150 [Denmark] (0.65)
Posted by Tone! on 2008-08-21, 20:53:12 (222.154.226.18)
HOLFI Power 150 Stereo Power Amp August 2008 Previous Conditioning Over the last eleven years, flirtations with new amplifiers both tubed and solid state have always lead me back to my 1997 CARY CAD3 .......

71: REVIEW: Holfi HOLFI Power 150 Amplifier (SS) (0.57)
Posted by Tone! on 2008-08-24, 21:01:27 (222.154.226.18)
Model: HOLFI Power 150 Category: Amplifier (SS) Suggested Retail Price: $3,500 Description: Stereo 150w, Zero Feedback, Class AB Manufacturer URL: Holfi Review by Tone! on August 24, 2 .......

Found 13 records in Cable Asylum.

1: Mains wiring: anything better than Romex, any reason to try? (6.89)
Posted by G-Man on 2001-04-10, 12:17:31 (132.233.247.7)
My current Hi-Fi AC circuit is shared by my TV and other household outlets. I’m considering wiring a dedicated 20A circuit (or circuits?) from the main service. The (possible) problem is that the dedi .......

2: RE: Question - 45 foot analog or digital cable run? (6.89)
Posted by Duster on 2013-08-19, 13:20:22 (76.104.217.128)
While this type of situation does not allow an ideal audiophile solution (as I prefer shorter length digital coaxial cables when allowable), Toslink for computer audio applications changed my mind abo .......

3: Risch twisted IC info (long) (5.22)
Posted by Big Mo on 2000-06-29, 11:00:52 (146.225.125.23)
I made a set of 89259/82248 IC using the Sean purchase. I started out using 45" cores which resulted in 42" twisted pairs, which comes to 3.5 feet or 1.0668 meters. I have a measurement lab and was a .......

4: Do a "Double Blind" listening test with a few people (5.18)
Posted by DunninLosAngeles on 2002-01-30, 11:08:51 (65.192.12.167)
and record your results. You not that you are trying to prove "that there is a difference". By this I assume you mean that people listening to different cables hear different sounds from each. Seems l .......

5: Is it possible it was the power cord all along ? Audioquest NRG-2 with Cambridge Audio 640C (4.33)
Posted by Bambi B on 2007-06-06, 10:57:58 (71.137.234.144)
Mates, I've had a Cambridge Audio 640C v2 CD player in my office system for about a year and a half, my first semi-serious CD player: Cambridge Audio 640C / McIntosh MR67 > Audio Research LS3 > ARC D1 .......

6: further temporal questions... (4.04)
Posted by Mart on 1999-07-22, 00:23:23 (155.218.171.242)
1) If signal velocities (or group velocities which is a query all by itself... #4) of the signal is frequency dependent, then wavelength is no longer inversely rated to frequency. At least, the direct .......

7: Additional Information (3.45)
Posted by Artar1 on 2005-06-04, 13:52:03 (69.225.237.88)
Tommytube, Let me provide additional background information to support my enthusiastic recommendation of Element Cables. My current system includes the Proceed AMP5 ($5,000), Klyne System 7 line stage .......

8: REVIEW: H-Cat DIY 139L choke filter Power Conditioner/Surge Protector (2.76)
Posted by The Killer Piglet on 2006-05-15, 16:35:14 (65.6.174.198)
Model: DIY 139L choke filter Category: Power Conditioner/Surge Protector Suggested Retail Price: $40 Description: DC choke filter, plugged into AC circuit with gear. Manufacturer URL: N .......

9: REVIEW: Hammond 139L Filter Choke Power Conditioner/Surge Protector (2.31)
Posted by The Killer Piglet on 2006-05-15, 19:15:31 (65.6.174.198)
Model: 139L Filter Choke Category: Power Conditioner/Surge Protector Suggested Retail Price: 36 Description: DC choke filter, plugged into AC circuit with gear. Manufacturer URL: Not Av .......

10: REVIEW: Running Springs Audio Haley Power Conditioner/Surge Protector (2.27)
Posted by jaybar on 2006-10-23, 17:49:32 (207.38.181.45)
Model: Haley Category: Power Conditioner/Surge Protector Suggested Retail Price: $1695 Description: 6 Outlet 15 Amp Power Conditioner. Includes Mongoose Power Cord. Manufacturer URL: No .......

11: REVIEW: DIY by Jon Risch CC89259 Cable (2.08)
Posted by Ulas on 2004-11-20, 11:55:51 (65.19.43.192)
Model: CC89259 Category: Cable Suggested Retail Price: $ ridiculously low compared to mf'g Description: Unbelievable speaker cable for DIY'ers Manufacturer URL: DIY by Jon Risch Manufa .......

12: DIY fine silver interconnect review. (1.93)
Posted by chopper87@aol.com on 2004-10-14, 15:20:00 (205.188.116.9)
My system consists of, Wavelength Gemini's/TJ Mesh Plate 45's, Recent Bent Audio NOH transformer based passive preamp, Sony XA777ES SACD/CD player, Mana 4 tier amp stand and single sound base, Audienc .......

13: REVIEW: Dodd Audio Reference Grade Preamp Preamplifier (Tube) (1.90)
Posted by ddemeterio5 on 2004-11-29, 01:46:10 (64.136.164.36)
Model: Reference Grade Preamp Category: Preamplifier (Tube) Suggested Retail Price: $2600 Description: Dodd Audio top of the line preamp Manufacturer URL: Dodd Audio Model Picture: Vi .......

Found 8 records in Computer Audio Asylum.

1: Why the 71A (5.90)
Posted by Gordon Rankin on 2010-05-24, 07:41:49 (216.196.208.234)
Gang, As many of you know I have been making tube amps and preamps since 1981. My first SET amp was the Sole 845 as I did not think anyone would pay for an 8W 300B amplifier. But then Mike Marx (SND T .......

2: Re: I don't think any USB audio devices have a master clock (5.90)
Posted by BFitz on 2005-09-07, 22:17:30 (72.224.84.53)
OK, read the D/A diaries link. The USB in isochronous mode, on the transmit side essentially stuffs the correct number of samples into 1ms packets, and this is the embedded clock. I guess the crystal .......

3: A truly exceptional dac-the H-cat dac (4.26)
Posted by Norm on 2010-06-09, 08:34:45 (74.192.12.55)
For the last several weeks I have been listening to a prototype of a new H-Cat dac. I had an h-Cat dealer friend rave about this dac, so I was very interested in what it would do in my system and welc .......

4: How to Power the Memory - Part 2.2 : Three Terminal Linear Regulator (3.73)
Posted by jackwong96 on 2011-11-26, 10:32:30 (183.179.35.189)
In Part 2.1, I built a regulator board attached to H55M-UD2H to power the memory, but I never listened to it singing because I used batteries. In this Part, an external regulator board is built for ge .......

5: Re: I don't think any USB audio devices have a master clock (3.60)
Posted by BFitz on 2005-09-08, 09:10:31 (72.224.84.53)
Hi John; Thanks for the explanation. My understanding of syncronous mode problem as described by the BB designer is this - the USB receiver is phase locked directly to the USB data, with a very short .......

6: Moving my music library to a larger drive - a mini drama (3.24)
Posted by Chris from Lafayette on 2018-11-01, 00:13:32 (77.111.246.28)
My previous hard drive was a 4TB RAID1. It got to be about 75% full, so I thought I'd avoid future problems with running out of space by going to a 6TB RAID drive, and moving my music files to the new .......

7: A more serious answer... (2.46)
Posted by Presto on 2008-03-20, 22:42:23 (68.151.33.164)
>>>Locating the PC in the listening room. Mine is. Oversized p/s fan, oversized CPU cooler with speed control, no case fans. No page file to minimize disk drive access. Can hear drive access (barely) .......

8: what advice would you give Fidelity Castro? (besides buying that info) (2.46)
Posted by hfavandepas on 2010-05-06, 05:46:44 (85.147.82.48)
Hi Reylands, Don’t let Fidelity Castro buy that information. Advice him what to do. Advice him what’s possible within a reasonable balance of: time, materials, attention, money ect, versus results / e .......

Found 5 records in Critic's Corner.

1: RE: My money is on you Mark...- (6.31)
Posted by mark.korda@myfairpoint.net on 2021-07-22, 18:40:52 (72.224.232.198)
Hi Viridian,I still can't find a shot of the Bellari's PA 555's insides. The knob and jacks look as cheap as can be. It might of been E-stat or you or someone else who showed the inside of another Bel .......

2: RE: I can agree with you there (6.31)
Posted by rick_m on 2012-09-05, 08:38:53 (96.25.74.167)
"one can put together a VERY, VERY good system with all single-ended circuits. But if that same circuit was built with the same care in balanced configuration, it would sound better balanced." And I c .......

3: Re: Think about effective tip mass of MC vs MM (4.68)
Posted by KlausR. on 2006-07-08, 02:03:36 (83.84.176.185)
"Well, tip masses resonate with the vinyl in the record. The lower the effective tip mass, the higher the resonant frequency." Well spotted, but that's snow from yesterday. And apparently not many car .......

4: Re: May you be very happy thinking that stuff is SOTA (4.67)
Posted by Soundmind on 2006-04-28, 10:29:13 (24.149.197.165)
"I left a Citation 11 like yours behind thirty years ago." Set for unity gain and with all filters out and the equalizer in bypass, I couldn't hear any difference when the signal went through the prea .......

5: Here are the estimated costs involved. Parts did vary over time as it was improved (4.21)
Posted by kurt s on 2011-09-24, 02:30:53 (223.206.13.60)
1) Custom ordered 6 mil and 14 mil SuperPerm 80 nickel lams for the SUT's $3000 minimum order. But I'll amortize that down to $300 just for the lams.....$300. 2) Custom ordered 32 AWG Cardas magnet wi .......

Found 21 records in Digital Drive.

1: Here you go.... (9.13)
Posted by John Elison on 2010-02-12, 12:55:25 (74.131.106.247)
This one has a 45-sec buffer for anti-skip mode and special bass boost circuit. It's not too expensive, either. Best regards, John Elison .......

2: Rega Planet circuit diagram / schematics here (9.13)
Posted by Werner on 2003-07-03, 23:50:35 (195.207.78.49)
schematic diagram as reverse-engineered by a French modder. Possibly incomplete or not entirely correct. .......

3: Not true with the latest CDM 12 (7.78)
Posted by unclestu52 on 2009-06-15, 01:24:11 (63.16.62.172)
Philips transports. You can buy them complete for $45 and they are simple drop in replacements as the alignment circuit is contained within the transport mechanism and already factory aligned. Some So .......

4: RE: Bags of 807's by the pound everywhere.... (7.38)
Posted by Cleantimestream on 2024-02-16, 12:35:44 (166.216.159.201)
Some said the 807 was the tube that won the War. Triode wired at 400 volts yielding 12 watts. Stripped down Williamson circuit. High primary impedance of 12K, only my push/pull 45 sounds better. We ar .......

5: RE: Marantz CC-45 (6.94)
Posted by Todd Krieger on 2015-07-14, 16:24:49 (24.255.45.192)
"Todd, I believe you have mentioned that Don Allen has retired? Did he pass along his procedures to anyone else for the Philips and Marantz changers?" I don't think I'll get any info on the tube upgra .......

6: RE: Sonic boom when turning off Benchmark DAC (6.67)
Posted by thisisjay on 2010-01-16, 15:46:34 (71.117.254.27)
I've been power the amp off and letting it cool for about 45 seconds so that it can't "feel" the Benchmark being turned off. It's silly that you would leave a $1300 piece of equipment that stays warm .......

7: RE: Best audiophile digital crossover (6.03)
Posted by KanedaK on 2020-02-09, 23:43:03 (94.111.40.237)
Are you absolutely sure that you need the delay? I didn't want a digital crossover, so after trying different models (lowish budget) I went for the K231 from Sublime Acoustic. It offers two way or thr .......

8: Re: advise about changing the clock of Sony DVD 9000 (5.79)
Posted by Elso Kwak on 2003-01-11, 01:21:48 (195.85.166.187)
Hi wlee, I can help you much better if you have a schematic or servicemanual. You can build the KWAK-CLOCK with a 45.1584 MHz fundamental mode crystal. The 48 MHz crystal you mentioned in a earlier po .......

9: Re: Ack DAC & Bent Audio NOH Preamplifier? (5.43)
Posted by Kuei Yang Wang on 2003-11-13, 09:54:21 (62.6.139.12)
Konnichiwa, I'm using a MF Audio prototype passive preamp with the Ack!dAck. This has a customised version of the S&B TX-102 fitted and is mostly similar to the unit Bent uses (close enough electrical .......

10: Re: Asynchronous Reclocking in the DAC, Clarification (5.21)
Posted by Elso Kwak on 2002-01-14, 12:42:25 (195.85.130.112)
Hi All, I am sorry this is a little confusing as the schematic on the DIYAudioforum is using the clock from the CDP transported by a separate cable to the DAC and it uses the Japanese IC's. I referred .......

11: Honestly Ned...... (5.16)
Posted by Alex Peychev on 2004-02-02, 23:07:44 (63.203.69.169)
...I will tell you despite the fact that I will be again accused in "self promotion"...:-) From what I have seen so far, Pioneer DV-563A-s has THE SAME transport as found in DV-45, DV-47A, DV-47Ai, Ma .......

12: Re: upsampling vs. 0Xoversampling, filterless (4.55)
Posted by chiggy on 2003-04-05, 19:39:55 (12.248.5.223)
hi T, whatter ya doing with 10 627's? from studying the kusunoki circuits and the discussions from the gainclone forum, a bud and i have built a CS8414->TDA1545ATN2-> biased AD8610's non OS dac. three .......

13: Re: Does anybody know what the deal is with the upgraded Heart 6000? (4.50)
Posted by Grid-leak on 2002-02-15, 23:50:05 (62.64.222.225)
Previously posted by Grid-leak on February 03, 2002 at 15:04:46 In Reply to: Heart Tube Rolling posted by garrett on January 31, 2002 at 09:45:18: I have just fitted a pair of NOS Mullard E188CC gold .......

14: RE: output stage: differential vs transformer (4.24)
Posted by Thorsten on 2010-09-29, 08:51:27 (109.169.26.3)
Hi, Transformers correctly implemented for SPDIF outputs have no drawbacks and offer full isolation of the source from the DAC. This helps a lot if the source is also connected to an AV system or is a .......

15: Power supply for Perpetual P-1A (4.17)
Posted by JimF on 2002-12-16, 08:02:26 (157.150.194.10)
I just won an Audiogon auction for a Perpetual P-1A digital processor, **without** power supply (the owner had sold the Monolithic P3 he had been using, and had lost the factory-supplied "wall wart"). .......

16: Bromo is right (3.85)
Posted by Charles Hansen on 2009-07-11, 11:48:50 (209.97.232.111)
He was (implicitly) comparing the reduced ringing and high-frequency rolloff (small, but audible) against a standard *oversampling* filter, not a "non-oversampling" filter-less design. I have often wo .......

17: Re: not so skeptical anymore? (cd player tweaks-damping)-long (3.17)
Posted by John Swenson on 2005-04-15, 21:51:17 (24.6.199.104)
Hello Wolf, this is a complex subject but I'll try and give a (hopefully) brief summation of it. It turns out that many CD tweaks have to do with what is called jitter. Jitter is the variation in the .......

18: RE: We'll be making one soon (2.77)
Posted by Charles Hansen on 2008-11-02, 20:08:44 (209.97.232.197)
>> What is going to be retail price for the new dac? Not really sure. The original plan was to make a super-simple, inexpensive box for around $1,000. But then "featuritis" has been creeping in. Not .......

19: REVIEW: AH! Njoe Tjoeb 4000 CD Player/Recorder (2.73)
Posted by shermanr@prw.net on 2008-11-18, 16:36:45 (201.147.116.66)
Model: Njoe Tjoeb 4000 Category: CD Player/Recorder Suggested Retail Price: $579 Description: Marantz CD4000 based, modified in Holland. Tube output stage using premium Wima/Vishay component .......

20: NAD M55 Universal Disc Player -- First Impressions (1.37)
Posted by 213Cobra on 2006-05-13, 14:59:03 (69.232.39.67)
NAD M55 Master Series Universal Disc Player System used with it: Pioneer 1120HD Plasma Zu Definition loudspeakers Klimo Merlino tube preamp Audion Black Shadow 845 monoblock amps Audiopax 88 monoblock .......

21: REVIEW: Audio Note DAC 3.1 Balanced DAC Processors (1.12)
Posted by KevinF on 2002-08-19, 22:40:03 (213.122.45.113)
Model: DAC 3.1 Balanced Category: DAC Processors Suggested Retail Price: $5950 Description: Transformer coupled balanced DAC Manufacturer URL: Audio Note Manufacturer URL: Audio Note .......

Found 2 records in DVD-Audiobahn.

1: Re: Circuit City SUCKS!! (6.01)
Posted by dizzy_leggs on 2003-09-12, 16:58:32 (67.121.190.41)
OK, So I spent almost 7,000 dollars on a DLP project TV, a Polk home theatre surround sound system, sub woffer, speaker stands, monster cables, extended warranties on everything and an installation pa .......

2: Re: agreed, but.... (6.01)
Posted by John Kotches on 2005-07-02, 07:33:12 (69.213.228.94)
No, I don't actually. Newly recorded material can better show what DVD-Audio and SA-CD are capable of. Recordings made 45-50 years ago have master tapes that have lost high frequency information, hav .......

Found 16 records in Hi-Rez Highway.

1: FYI: Sony could quit producing SACD's entirely and it wouldn't hurt the format at all as there are (8.40)
Posted by Teresa on 2001-12-08, 23:54:33 (198.81.16.189)
now over 45 labels producing SACDs. And Universal music sells about 50% of the music sold in the world. And they plan SACDs to be the FORMAT of choice (ie: over CD or DVD-Audio). I personally feel th .......

2: I turn it off and here's why. (8.40)
Posted by Dr. Audio on 2001-07-23, 14:33:09 (207.18.199.198)
1. I have a tubed preamp (with limited-availability NOS tubes), which takes at least 45 minutes to sound its best, so my SCD-1 might as well warm up at the same time. 2. I've never seen any definitive .......

3: Re: Where is the Tower in Dallas (5.96)
Posted by oscar on 2001-12-05, 05:46:01 (216.228.130.128)
It's on Lemmon av just NW of Turtle Creek. They carry Sony's ($20.99), Telarc, AQ, I think DMP. However, the last couple of times I've been there, I have not noticed any additions to a seemingly dwind .......

4: Re: Question for Hi-rez Folks (5.15)
Posted by Magnetar on 2001-09-21, 16:21:59 (205.188.201.206)
Hello, I hear the Jensen transformers sound good. I just bought a used Audio Research PH-2 that will more than likely replace my Audible Illusions with the Ortofon transformer. I won't be needing the .......

5: RE: You've misread. (4.92)
Posted by Jim F. on 2009-01-13, 13:59:16 (157.150.192.237)
> But a format has never existed, doesn't exist and > will probably not exist any time soon as a niche > format to begin with. It has to be widely established > first. Well, that's a bit of an oxymoro .......

6: A comment on the ICs and the player. (4.59)
Posted by jsm on 2008-01-03, 14:28:49 (128.114.134.151)
First the ICs. I've been at this audio fanaticism for more than 45 years and have tried literally hundreds of cables of different makes and costs, from drugstore ICs that cost less than $3 to ICs that .......

7: So you haven't modded you SCD-1 yet Rich? (4.27)
Posted by Ozzie on 2008-04-09, 16:18:34 (198.24.6.134)
Since you have had your player in the shop twice, I trust you respect it enough that you didn't send it to the Sony Center. As an AAer you'd know the competency available there for your warranty or ha .......

8: Re: You hit the nail on the head, DUI. (4.20)
Posted by shandor on 2002-09-10, 19:56:57 (12.90.167.251)
I have similar feelings. When I was younger, I had some of their tunes in my band's playlist. Funny thing though, I have never owned an RS album, CD or even a 45! Never wanted to! I recently added an .......

9: Re: FORGET THE MUSIC what are the ABSOLUTE BEST audiophile disks (4.17)
Posted by Awe-d-o-file on 2004-09-24, 20:29:19 (170.215.144.182)
Some of my favorites are: Cal Tjader and Charlie Byrds Crystal Clear Recordings- Originally 45 RPM Direct to Disc recordings the CD's were made from the master laquer- no noise floor and very sharp. R .......

10: Ozz, you're not new here ... (4.01)
Posted by TBone on 2012-02-07, 11:38:07 (174.137.241.221)
because finding these remarks were simple. >>No one here ever said that a stock early Sony was close to the best vinyl. No one. Some quotes from "no ones" ... (Hell, I didn't even bother looking up Te .......

11: A counter challange Re: A candid exchange with John Atkinson: (3.09)
Posted by Norman Tracy on 2004-03-08, 22:16:46 (216.226.6.206)
Dear Mr. McConnell, Wow, your post and the resulting flame skirmish really took me back. Ah, the glory days on the Usenet when we discovered our fellows on the rec.audio* news groups and how quickly s .......

12: Review: Prt. II SONY XA5400es A/HDMI v. XA9000ES i.LINK/A (2.55)
Posted by JohnDoe1 on 2011-04-18, 14:39:21 (71.41.38.234)
Dear readers, part II: Well after a short fight with Sony over what has to be the most expensive 1.5 meter cable in the world - $45 and on backorder; i.LINK IEEE - I went with a different approach - B .......

13: Just take a browse at these constructive posts . . . (2.11)
Posted by Martin says on 2002-11-20, 05:19:28 (62.173.114.126)
1: It doesn't play DVD-A... (0.00) Posted by Rich on 2002-11-19, 17:08:41 (67.86.129.237) but that's a good thing. :) ....... 2: Re: Another thing . . . (0.00) Posted by Rich on 2002-11-19, 17:04:37 ( .......

14: SCD-1/777ES Alternative Clock Mod (1.97)
Posted by jhietbrink on 2003-05-12, 18:53:50 (12.247.43.125)
O.K. – so your first question is “Why?” There are a number of add-in clock upgrades available including the Audiocom Superclock II, LC Audio LClock XO2, Tent Engineering XO2 and – if you want to buil .......

15: More SCD-1/777ES Power Supply Mods (1.59)
Posted by jhietbrink on 2003-10-26, 17:58:32 (12.209.231.80)
"I just want to say one word to you -- just one word -- ceramics." (A slight recasting of advice from a businessman in “The Graduate”). In the end, the most significant cap change I made in the Audio .......

16: Hey paulcordingley... (1.38)
Posted by Rich on 2001-12-29, 16:09:56 (24.45.36.221)
How is it that you're responding to Christine Tham's 12/29 post (today) less than 2 hours later from the same IP address? Also what is your connection to Trevor Wilson, Zakalwe, Arctophile, HiFryer, e .......

Found 1 records in Headphone Heights.

1: RE: 45 SET Headphone amp? (7.93)
Posted by Bill Way on 2022-01-08, 07:51:39 (216.131.83.4)
Not a 45, but a single-ended triode, output transformer-less headphone amp for high-impedance cans, built around the 8080/5998/421A dual triode. It's heaven on my Senn 800's. Bonus: there's plenty .......

Found 10 records in Inmate Central.

1: Troubleshooting (9.42)
Posted by Inmate51 on 2023-01-10, 20:40:29 (47.188.188.128)
"The usual go-to is the GFI breaker in my bathroom. It would NOT RESET." "If all the wires are secure, My FIRST INSTINCT is to swap to a new GFI." You may very well be right. But... You've repaired th .......

2: I've said it before... (9.42)
Posted by Muzikmike on 2005-09-21, 16:29:41 (4.23.226.223)
I think Lloyd could make a circuit that uses light bulbs...AND make it sound good! I am constantly surprised by the motor control...the ONLY electronics I'll ever be able to afford from chez Walker... .......

3: DVD player (8.43)
Posted by psgary on 2004-02-28, 19:25:34 (4.60.26.63)
Yo, Todd, the player is a Philips DVD 624. Some guys at Digital are raving about the Philips 727 and others the Toshiba 3950, each of which can be had for about $70. The 624 was $45, but it was a clea .......

4: Court Throws Out Berkeley, California's Ban on Natural Gas (7.18)
Posted by Rod M on 2023-07-05, 09:15:43 (204.94.81.82)
I was surprised that the 9th circuit would rule to overturn the ordinance and am happy that they got it right. ;) In San Diego County, several cities have gas bans in the works. In fact, the San Diego .......

5: Dang! Did it again. (5.79)
Posted by psgary on 2004-02-25, 22:05:42 (4.60.26.63)
I buy a dvd player on Sunday and spend a few days away from the 'puter to test out the video portion and now I've got to take a week's worth of sick days just to catch up at Central. Those dvd's might .......

6: My Power Queen is here. She's a beauty.... (5.60)
Posted by AbeCollins on 2023-06-22, 11:16:24 (73.229.163.4)
About 45-Lbs lighter than an equivalent capacity lead-acid battery and about 4-Lbs to 5-Lbs lighter than other equivalent capacity LiFePO4 batteries. Icom IC-746 Pro + 12v 100-Ah liFePO4 battery ~ 20 .......

7: RE: Does the internet ever just become the boring time waster it really is? For you? (5.34)
Posted by Inmate51 on 2014-11-20, 07:32:23 (173.57.125.26)
No. I spend a lot of time on the Internet while I'm doing other things. For example, I'm typically here on the AA in the morning while I watch the stock market on another computer, practice on my hor .......

8: Local newsrag has some intriguing non-news... (5.17)
Posted by DevillEars on 2006-06-28, 13:26:16 (196.25.255.195)
The truth is out there ... somewhere South Africa's Unidentified Flying Objects Resource (Saufor) will host its second annual Unbind Your Mind UFO conference in celebration of World UFO Day on July 1 .......

9: As opposed to... (4.36)
Posted by mkuller on 2017-11-16, 10:33:29 (107.205.10.55)
Amplifier: Venerable Mullard 5-20 circuit mono blocks updated to 4-60 (SS rectified, 60 Watts, 0 NFB) with Gold Lion KT-88s Dual mono, direct-coupled, parafeed UX-45 stereo amp P-to-P wired Tubelab Si .......

10: Wanna get pissed-off? Sorry if this is old news, but I just heard about this... (4.27)
Posted by subcoolman on 2006-04-10, 14:21:23 (66.179.201.209)
A copy/paste from the Associated Press: Lawsuit Filed in Detroit 911 Call Response By SARAH KARUSH, Associated Press Writer 47 minutes ago SOUTHFIELD, Mich. - A lawsuit was filed Monday by the family .......

Found 13 records in Inmate Systems.

1: smollett - Bedroom 4 (3.18)
Posted by smollett on 2004-08-03, 20:00:52 (67.81.172.212)
Moniker: smollett System Name: Bedroom 4 Amp: Fisher 400 Receiver, all original Fisher signal and driver tubes, two NOS RCA 7868s and two original Fisher-branded 7868s (dated 1965) Kenwood KR-720 Rece .......

2: tlea - constantly in flux (3.18)
Posted by tlea on 2004-07-12, 20:02:47 (72.204.156.58)
Moniker: tlea System Name: constantly in flux Amp: Ayon Spirit III v4 tube integrated (first tube amp after 45+ yrs w/solid state separates) Preamp: none (integrated) Speakers: Silverline Sonata II (e .......

3: AZ_Gary - Two Channel - Main (2.50)
Posted by AZ_Gary on 2005-08-03, 16:20:53 (68.231.56.210)
Moniker: AZ_Gary System Name: Two Channel - Main Amp: Bottlehead Paramour II with Iron and Cap Upgrade, 45 Shunt Regulated mod, Obbligato parafeed caps and Soviet teflon coupling caps. Using Sophia 45 .......

4: Charles Houston - Home Theater #1 (2.29)
Posted by Charles Houston on 2000-10-31, 17:10:00 (216.192.101.44)
Moniker: Charles Houston System Name: Home Theater #1 System Rev Date: 2000/10/31/17:10 System Rev IP: 216.192.101.44 Amp: Pathos Twin Towers integrated for front L+R. Krell KAV500/5 for center, sides .......

5: woober goober - Tubey Groover (1.86)
Posted by woober goober on 2012-08-22, 08:05:54 (71.56.75.240)
Moniker: woober goober System Name: Tubey Groover Amp: Audio Mirror 45 Watt SET monoblocks (parallel 6C33C power tubes; hexfred upgrade; Sylvania JAN-CHS 6SL7GT/VT-229, early 1950s; Sylvania 6SN7GT, 2 .......

6: je2a3 - JE Labs 2 Channel Hifi (1.74)
Posted by je2a3 on 2003-07-18, 12:44:29 (108.2.164.203)
Moniker: je2a3 System Name: JE Labs 2 Channel Hifi Amp: DIY SETs (8wpc > 750 milliwatts per channel): 300B, 2A3, 45, 46 and 71A using Tango, Tamura and Noguchi OPTs (more info - see link below) Pre .......

7: George Hoenninger - 2 Channel Music (1.72)
Posted by George Hoenninger on 2002-12-21, 18:18:19 (216.45.152.94)
Moniker: George Hoenninger System Name: 2 Channel Music System Rev Date: 2005/07/01/16:48 System Rev IP: 216.45.152.94 Amp: McCormack DNA-500 Preamp: TacT RCS 2.2x with upgraded power supply from Aber .......

8: no xo's Main 2 Channel Music System (1.67)
Posted by no xo on 2006-03-09, 12:45:58 (68.77.208.5)
To add your system, you must register ."> Audio Asylum Inmate no xo's Main 2 Channel Music System System Home / FAQ / News Classifieds .......

9: Delrenton - Main system (1.63)
Posted by Delrenton on 2002-08-28, 09:44:19 (64.122.99.93)
Moniker: Delrenton System Name: Main system System Rev Date: 2003/03/14/12:43 System Rev IP: 64.122.99.93 Amp: Berning ZH270 with NOS cryo'd tubes Preamp: Bent Audio Passive Transformer Volume Control .......

10: escape2cfc - Chuck's System (1.57)
Posted by escape2cfc on 2009-03-03, 09:32:14 (107.139.205.44)
Moniker: escape2cfc System Name: Chuck's System Amp: VTV MCINTOSH MC-30's Korneff 45 Bob Latino Dynaco ST-70 Quicksilver Horn Monos Quicksilver Mid Mono Bob Latino Dynaco ST-70 Bottlehead Paramounts W .......

11: hatfield - Main (1.45)
Posted by hatfield on 2003-11-12, 14:54:23 (67.89.8.62)
Moniker: hatfield System Name: Main System Rev Date: 2006/07/06/07:25 System Rev IP: 67.89.8.62 Amp: Jeff Korneff 45SE (Horns) - tube rectified, 45/6SN7 based single-ended triode amp using 0.22uF TFTF .......

12: Paul Butterfield - High Zoot, Quite Mad Systems [QMS] (1.44)
Posted by Paul Butterfield on 2001-10-24, 15:59:34 (67.76.221.228)
Moniker: Paul Butterfield System Name: High Zoot, Quite Mad Systems [QMS] Amp: ALL BELOW UNDER REVISION! OUTDATED! Switched between a Pass Aleph 30, a Mac 240, and a Dada Darling [Under Construction]. .......

13: Robert C. Schult - RSAD Music Room... (1.28)
Posted by Robert C. Schult on 2002-08-11, 00:38:33 (24.12.92.25)
Moniker: Robert C. Schult System Name: RSAD Music Room... Amp: 1 pair of Pass Labs Aleph 3 amps modified and used in a vertical bi-amp arrangement. 1 pair of GTA SE40 amps refitted with retempered RCA .......

Found 2 records in Isolation Ward.

1: I would submit (3.79)
Posted by unclestu on 2011-05-18, 12:47:00 (72.253.179.5)
that it is you who has blocked out further investigation, claiming that all you know and have submitted to has already been discovered by none other than yourself and Peter. Details of music may well .......

2: An ordinary man has no means of deliverance (3.79)
Posted by geoffkait on 2011-05-22, 07:38:13 (72.66.39.40)
"I submit that it is you who has blocked out further investigation, claiming that all you know and have submitted to has already been discovered by none other than yourself and Peter." That's really f .......

Found 2 records in Music Lane.

1: My 'Club Saving' is about $6.45 / disc (7.85)
Posted by Chuck on 1999-05-12, 06:58:33 (198.133.22.68)
I recently joined Columbia House and this is how it breaks down for me: 12 Free plus buy one at $6.98 get one free (pay about $2.81 / disc S&H) 14 discs / $46.32 => $3.31 / disc Buy 6 at Club Prices ( .......

2: RE: I also think the Cain's are Gorgeous (7.85)
Posted by kitch29 on 2017-03-08, 11:44:43 (96.37.31.28)
Unfortunately, the one time I heard them long ago at the Mid-West Audio Fest, I didn't like their sound at all. Back then I had built a Foreplay and 2A3 Paramours but went in the opposite direction dr .......

Found 1 records in Rocky Road.

1: newsflash: iggy popped! (4.29)
Posted by gopher on 2001-06-29, 06:38:32 (38.30.183.102)
Pig stays out of pokey ‘Iggy' allowed to stay at home during appeal Evadna Bartlett Daily Mail Putnam reporter Thursday June 28, 2001; 10:45 AM WINFIELD, WV -- Iggy the Piggy will get her day in cour .......

Found 11 records in OTL Asylum.

1: RE: Circlotron with MOSFET output (5.58)
Posted by Keith Lee on 2011-12-10, 03:37:27 (61.18.170.165)
You wrote: "Mr Paul Hynes SS Fet Circlotron circuit is basically correct , but need bias circuit for output Fets which is not present on schematic from your link ! , it could be driven with small SET .......

2: RE: Circlotron with MOSFET output (5.58)
Posted by Keith Lee on 2011-12-09, 17:19:40 (61.18.170.216)
My friend is working on same type of amplifier and he just sent me a link of the circuit from Paul Hynes, what do you think? Obviously, I can have tube as driver stage via 1:1+1 interstage transformer .......

3: RE: Circlotron with MOSFET output (5.07)
Posted by Banat on 2011-12-10, 00:58:19 (178.222.31.52)
Mr Paul Hynes SS Fet Circlotron circuit is basically correct , but need bias circuit for output Fets which is not present on schematic from your link ! , it could be driven with small SET for sure , b .......

4: Re: Another recent exchange between David and Ralph... (4.87)
Posted by twl on 2004-10-21, 06:11:47 (67.213.17.251)
Hi. I heard my name mentioned, and decided to come in for a chat. I own a custom ZOTL that Dave made for me last year. It is a SET-ZOTL which uses Type 45 output tubes driven by 6SN7 tubes, choke load .......

5: Re: SLCF (4.53)
Posted by Dan on 2000-03-11, 07:53:42 (0)
> Dan, you have an open 6SN7 location. Do you want to give it a try? Are you kidding? Paul, you say jump and I ask for directions to the golden gate bridge!! But I have little worry about having the .......

6: Re: "The TUBE Sound?" (4.07)
Posted by Lew on 2001-02-27, 07:00:32 (0)
Dan: Can it be true? Have you really changed over to low power amps plus horns? Seriously, I make it a point NOT to be dogmatic about this stuff. Like my favorite philosopher, Frank Sinatra, said, it' .......

7: Re: Schematics (3.34)
Posted by Al Sekela on 2002-08-19, 09:27:59 (0)
Greg, Welcome to the world of high-end audio. I believe Atma-Sphere amplifiers are the best in conveying the details in sound recordings, and have derived great satisfaction from making my own equipme .......

8: Re: Question for Mark Gilmore(6SL7 or 12SSL7) (2.98)
Posted by Al Sekela on 2002-05-13, 19:54:53 (0)
Andy, Let me field this one for Mark, as I've been one of the instigators of the *SL7-in-the-current-source tweak. The original current source used 2 Zeners and one triode in a 12AT7. Ralph Karsten's .......

9: Re: What is wrong with Futterman? (2.35)
Posted by Mr. Moscode on 2005-07-29, 10:27:20 (24.218.229.177)
I was chief engineer for New York Audio Labs during OTL production years and I have been upgrading and redesigning Futterman OTL's for 23 years. Go to http://moscode.home.att.net/ for my website and b .......

10: from George Kaye post.. (2.15)
Posted by rhinohifi714 on 2012-12-01, 18:01:47 (184.63.29.179)
Re: What is wrong with Futterman? Posted by Mr. Moscode (P) on July 29, 2005 at 10:27:20 In Reply to: Re: What is wrong with Futterman? posted by Ralph on July 27, 2005 at 10:59:50: I was chief engine .......

11: ESLs and OTLs (2.11)
Posted by Ralph on 2014-01-30, 12:27:38 (64.122.72.31)
I don't doubt the truth of what you say,... Posted by Lew (A) on January 30, 2014 at 06:55:45 In Reply to: RE: I'm thinking that this amp was not class A or anywhere near. posted by morricab on .......

Found 4 records in Pro Audio Asylum.

1: Passive Crossover Question (5.79)
Posted by kwatson on 2005-09-05, 06:15:44 (151.197.35.149)
I am building some PA speakers for vocal monitoring in a rehearsal studio. I obtained the plans for these from the B&C Speakers web site. They show a schematic for the passive crossover between the 12 .......

2: Re: Siemens/Telefunken V272 (5.79)
Posted by AlexK. on 2003-02-24, 15:43:13 (217.226.212.159)
Hello Bambi B , all the V 72/74/76 and so on have their own built-in 220 Volt AC power supply . The amps from the 272/274/275 line are all for a common 24 Volt DC from a separate power supply , they a .......

3: Re: ANYONE HEARD OF PULSAR LABS/PMI??? (5.09)
Posted by stowbari1@yahoo.com on 2004-03-01, 20:26:09 (24.223.167.90)
It's good to find at least one person who's heard of Pulsar Labs. My father was part of the company from the beginning right up to the end. We have a model A-2500 amplifier and a RTA-150 spectrum anal .......

4: Simple 48 V phantom solution for DIY's (4.53)
Posted by over-reactor on 2002-02-24, 18:46:14 (64.12.105.171)
I am just finishing my first production run of a 48 Volt phantom power supply module. I originally planned to just make a few for my own personal use. But I figured that other hobbyists (or small audi .......

Found 16 records in Propeller Head Plaza.

1: Read the rest of the paragraph. (7.21)
Posted by Leisure7 on 2003-03-28, 09:38:57 (64.171.5.177)
Any voltmeter connected to an isothermal circuit containing dissimilar metal junctions sees the same metal in both leads. If not in the external leads, then somewhere inside, the same metal will be us .......

2: Re: Cap loaded (7.21)
Posted by mfc on 2003-07-25, 17:20:42 (67.75.231.96)
Hi, With a .2uF || 10 ohm load the frequency response is down .022dB at 20Khz. The .25dB point is at 45.4Khz. It rolls off pretty gracefully from there. The -3dB point (relative to 1Khz) is 112.14Khz. .......

3: Re: Unfortunate (5.66)
Posted by jneutron on 2003-10-16, 16:23:05 (24.190.116.168)
JC: ""So what, IF you CANCEL the di/dt component at the output?"" From Hawksford's own words...he cancelled only the external component of inductance...not the internal.. So, he didn't null out the in .......

4: Re: Dissimilar metals are they really a problem?? (5.00)
Posted by Leisure7 on 2003-03-27, 10:59:38 (64.171.4.108)
One way to approach a question like this is to ask how bad it could get. The reality is likely to be somewhere between no effect at all and the worst possible effect predicted by simple-minded theory. .......

5: transient test - Part II (4.76)
Posted by mfc on 2003-07-30, 21:52:14 (67.75.231.51)
Hi, Been looking at differences between a simple cathode follower and a skiklai follower, trying to understand them. Input uses bandlimited (27th harmonic) square wave of 1050Hz at 7V peak combined wi .......

6: RE: OK, let's try a different angle. It's an AC circuit, right?. (4.67)
Posted by tomservo on 2025-05-29, 05:20:03 (174.131.166.128)
I think your missing a key part of this. A microphone detects the sound, it proportionally turns the pressure into a Voltage which is the then the converted audio signal. Microphones all have a "sensi .......

7: Bypass the cathode resistor (or not) (4.31)
Posted by mfc on 2003-05-10, 21:31:03 (67.75.230.129)
Hi, This was part of a subthread down below discussing whether or not to bypass a cathode resistor because it changes the harmonics. It was an interesting question posed by John Curl ( I always read h .......

8: "But as you may have guessed, many audiophile vendors leave their spec's up to the users' imagination. " (4.00)
Posted by Analog Scott on 2008-05-11, 09:35:13 (64.12.116.141)
Power Plant Premier How to Buy Purchase Online B-Stock Items Find A Dealer Product Details More Info Related Articles Power Conditioners Reviews Positive Feedback Awards Need Help? Wa .......

9: Relative; to what? (3.83)
Posted by tomservo on 2006-09-07, 20:16:12 (204.87.188.80)
Hi First, a few bits of reality from marketing. Normally if one has Teflon insulation, one also has silver plated wire. The reason is the high temperature needed to extrude the TFE would oxidize the r .......

10: Sure...my RMX 1450 is 45 pounds in it's case.. (3.37)
Posted by jneutron on 2003-08-22, 10:21:06 (130.199.3.22)
In trying to find out what John is doing, I was brushed off.. There is some equip here I could glom, but don't know if it's any better or worse than what JC has. No info has been forthcoming from JC t .......

11: Long-term DBT example (3.30)
Posted by andy_c on 2008-04-25, 17:52:32 (67.164.165.165)
kerr> At the risk of "blindsiding" myself, how would someone set up a long term DBT? hobby> will a short sbt be inferior to a short sighted test? kerr> Hard to rank them. Short tests are worthless. .......

12: Cheever's Thesis Half Right (3.15)
Posted by Scott Frankland on 2003-05-16, 15:30:09 (63.206.94.64)
Before I explain why I think Cheever is only half right, I would like to apologize to him for my derogation in a previous post. My comment about his equation being "sloppy" was not meant to impugn its .......

13: I See Civillity Is Wasted With You (3.10)
Posted by thetubeguy1954 on 2007-04-11, 10:35:24 (70.46.7.90)
Clifff, So much for expecting civility from you, oh well. You have this obsession with being sarcastic with those who don't agree with you 100% so I'll just state the facts and stop trying to be civil .......

14: Re: I fixed a bias problem in my Mosfet follower (experiment #1 continued) (2.48)
Posted by mfc on 2003-06-30, 20:02:34 (67.75.230.229)
Hi, I thought I'd put these results up here since the other thread below was starting to get branch rot. The Cathode follower simulation was similiar to the Common cathode simulation done earlier. A 6 .......

15: As I said below, I'm reading the thesis again. (2.15)
Posted by Soundmind on 2006-06-14, 20:51:29 (24.149.197.165)
The thesis focuses on a single idea, that there it is possible to create a measurable figure of merit the author calls a Total Aural Disconosnance (T.A.D.) which relates the "like-ability" of the soun .......

16: Same problem all along (2.11)
Posted by Jon Risch on 2007-01-07, 19:16:40 (65.12.40.158)
David Hafler tried to prove his DH-200 power amp was "perfect", by showing it could achieve a -60 dB "null" in the midband using a similar kind of technique, but unfortunately for him, no one else wou .......

Found 2 records in Radio Road.

1: The tuner? depends if there are stations worth it, butttttt (1.68)
Posted by Timbo in Oz on 2008-08-17, 19:10:11 (203.129.46.168)
Why NEW? valve tuners rebuilt OR classic analogue SS OR do UP the Yamaha! here's TIC on the 1020 "Yamaha T-1020 (1986, $359, photo, closeup) search eBay The T-1020 is a black digital tuner that was se .......

2: RE: FM tuner recommendations (1.68)
Posted by Brian Levy on 2014-02-28, 08:07:17 (75.119.233.83)
Criteria seems to be: 1) budget of around $200 - does this include tuner or tuner and antenna system? 2) sensitivity may not be a priority as you state you have decent signals for stations you listen .......

Found 37 records in Speaker Asylum.

1: RE: Shouting (7.94)
Posted by KanedaK on 2020-02-01, 01:46:28 (94.111.40.237)
I have a new active crossover, the K231 from sublime acoustics; it has a continuously variable BSC (baffle step compensation) circuit with selectable range; in fact a shelving filter. It isn't probabl .......

2: Re: Thanks, my cj is the CAV50. Will this work? (7.94)
Posted by Phil Sieg on 1999-07-27, 09:13:59 (198.144.162.46)
No, the integrated won't do the trick. Yes, the 45 is a lower power tube (1.6W), but many prefer it to the more lush and romantic 2A3 or 300B. Doc has a parafeed 45 design that was in the late '97 or .......

3: Re: Selecting an outdoor speaker (7.26)
Posted by alon5rev3 on 2004-09-11, 09:17:18 (68.120.18.231)
I just installed 2 pair of Polk Atrium 45 last week and am very impressed with the sound quality and even the bass. They replaced some Boston Voyagers which were also very good and were out in the wea .......

4: Re: The most important question may be... (6.97)
Posted by mauimusicman on 2007-02-25, 02:05:45 (70.95.153.236)
"Thanks Jim. I should started by saying "there is a constant phase difference between the two drivers, which means there is no relative phase shift between the two drivers at all frequencies. Thus, th .......

5: Re: Early B&W Speakers - Need your Help. (6.40)
Posted by Scott G. on 2001-06-02, 20:12:19 (216.209.137.15)
Thanks for the info !! I think you're right about the age. They sure have that bextrene look to them. Would these be the early incarnation of the "805"s ?? They seem to play well, but as usual for a p .......

6: RE: Clarifications on Time Coherence (6.20)
Posted by RoyJ on 2012-03-15, 10:01:05 (75.71.174.79)
Hi Villa, Thanks again for your comments. I did not advance both vectors. I began with one at +45 degrees and the other at -45 degrees (or 315 degrees). Then I added 180 degrees to that first vector, .......

7: Re: Given Best Buy's Track Record... (5.84)
Posted by JasonRF on 2003-02-04, 07:02:45 (129.55.200.20)
You said it: "At least they have a good return policy so you can in-home demo." It's sad to say that Best Buy and Circuit City and Cambridge Soundworks have MUCH better return policies than many of th .......

8: RE: PA speakers: Warning (5.61)
Posted by BigguyinATL on 2011-07-15, 13:01:19 (65.218.140.58)
40 Watts will not allow very good sound live unless come kind of signal compression is done... The amps will clip before it sounds loud... In an attempt to avoid this go with a high sensitivity loudsp .......

9: Just bought an old AudioPro, sounds good. (5.56)
Posted by glennw on 2003-11-08, 20:12:08 (67.4.67.117)
These are not exactly common in the US (Swedish company I believe) but they have their fans online, including here. I just yesterday picked up a B1-45 sub (15 years old!) for $175 with a few dings and .......

10: Re: Has to do with UL testing procedures... (5.39)
Posted by williak on 2003-05-28, 14:14:15 (209.142.247.98)
Bruce, I'll try to dig up some more info for you. As to your safety/performance question - the manufacturers desire UL listings for any number of competitive and liability reasons. There are a number .......

11: It came with an active Eq box for tape loop / pre-to-power use? (5.27)
Posted by Timbo in Oz on 2005-03-02, 15:53:25 (203.24.160.120)
this can get you down to near 30 hz, from 40 Hz - whic is its in-room roll-off, with room gain. But I doubt the 805 Matrix would play VERY loud down there. The black-box is called the '800 Series Vari .......

12: Re: Budget Speakers for old Sansui receivers (4.86)
Posted by JasonRF on 2003-04-07, 13:50:33 (129.55.200.20)
Maybe Cambridge Soundworks Model Sixes would fit the bill. They are often on sale for something like $150/pr. I have listened to them in the store and think that they are a very good value. However, I .......

13: My experience (4.77)
Posted by Bill Way on 2017-04-14, 08:19:34 (173.70.56.6)
I've done a couple sub setups. Both used a VTL Deluxe preamp that has two sets of independent outputs (cathode follower to the mains, and 12AU7 buffered to the sub) and an old ACI Titan II LE powered .......

14: The speaker event I would like to attend (4.46)
Posted by DavidLD on 2006-06-12, 07:51:27 (64.12.116.131)
A collection of all these under $50 a pair current commercial speakers, the Best Buy $45 the pair Insignias, The Pioneers that often go for $28.98 the pair at Circuit City, Radio Shack's $40 the pair .......

15: I think what our friend was getting at... (4.37)
Posted by Presto on 2010-02-18, 15:35:33 (207.216.246.51)
...was that caps have non-ideal behaviour including ESR and ESL. This means that as Xc decreases with frequency the near-constant ESR will become an increasing factor in the capacitors "phase angle er .......

16: Here's what Pass writes of the X100. (4.35)
Posted by jeffreybehr on 2011-09-07, 17:01:42 (68.231.22.52)
"The XA100 is optimized for 8-ohm speaker loads. Having said that; we are not aware of any speaker on the market that presents an unusual or difficult load for these amplifiers. The XA amplifiers do n .......

17: DC bias'd electrolytics in crossover (4.35)
Posted by Lew on 2011-08-25, 22:13:19 (74.96.73.210)
Has anyone else tried this? I posted questions a few months ago. There was not much enthusiasm. As some know, it is not a new idea to apply a DC bias to electrolytic caps used in a crossover. I implem .......

18: Re: Have you ever measured your room? (4.12)
Posted by Gmood1 on 2005-12-24, 14:10:07 (64.136.49.225)
Hi Gerry my room isn't overly large but it is well damped by furnishing etc. I had some 4 or 5 db peaks around 48,47,46,45 Hz. The 1 dB variance was the average I was given with a digital SPL meter.Th .......

19: RE: Because your question doesn't compute (4.04)
Posted by Drew Eckhardt on 2010-09-06, 11:31:08 (99.173.30.62)
keithd writes: >Some dynamic driver dipole speakers can achieve a cardiod pattern to some extent, as can some panel speakers, but it's too difficult with either driver type to use drivers big enough i .......

20: Re: Any speaker kits that sound good at low volume? (3.96)
Posted by phenderson on 2000-10-27, 16:54:21 (12.5.51.222)
The conventional wisdom is that ported designs sound better at low volume levels, while sealed box designs need to be cranked a bit before the sound jells. Horns and electrostatics are considered the .......

21: Re: Tannoy System 1200 (3.90)
Posted by vintage64 on 2005-07-02, 09:06:43 (84.141.179.44)
Well, I tried the Vincent SV226 hybrid amp with 2 x 100 w at 8 ohm... in comparison it sounds awfull, kind of drained of energy, sorry to say this. Good bass response, but not musical at all. For a fe .......

22: Re: Okay, Okay. (3.60)
Posted by FredT on 2006-06-12, 13:16:39 (68.201.203.238)
Can't wait to hear what you find. I expected the glossy front panel to be thin decorative plastic, but surprisingly it's solid mdf, so you actually have a 1" total thickness baffle. It's held in place .......

23: I re-read the instructions here... they're not correct. (3.59)
Posted by Presto on 2019-12-27, 15:40:56 (198.53.157.193)
'To order parts: you will need the entire value of the Lpad, eg 8 ohms. And the value of the resistance you measured between terminals one and two. A Lpad is a voltage divider, like a volume pot. You .......

24: DIY Servo Subwoofer (3.57)
Posted by mr.bear on 2003-07-20, 12:41:13 (67.168.54.93)
Has anybody had any experience with a DIY servo sub from a small manufacturer named Rythmik Audio in Orange County (CA)? Their website is clear and comprehensive and makes sense to me at my level of u .......

25: Cannot say for sure (3.36)
Posted by Panelhead on 2009-10-14, 18:03:48 (98.196.133.233)
I only have the actives, both 11L and 12L. they go low for the respective size of the cabinets and low end drivers. Neither is for rock and rollers. Never heard any of these passive, either L or L2. .......

26: -just a strange attack (3.19)
Posted by RoyJ on 2003-07-26, 15:55:57 (208.205.225.86)
Hi David- It's not about "my way or the highway". Campy made explicit charges that everything I had said about loudspeaker design was ficticious- that "only he knew the truth..." (I asked him to techn .......

27: RE: Friendly advice: Buy a kit (nt) (2.76)
Posted by thump on 2016-11-04, 01:20:31 (68.227.253.158)
i already have my amp. it's a Planet Audio BB1200.4. before i decided on that, i was planning on using sure modules, but that caused issues. class D amps like higher voltages. if i used sure module .......

28: Time and Phase of multiple driver loudspeakers (2.67)
Posted by audiographic on 2003-08-05, 10:36:55 (68.86.99.240)
I see much stuff about phase and time with confusion. If there are two drivers mounted on a baffle, say a midrange and a tweeter, then it would be nice if the acoustic radiation from the two drivers w .......

29: REVIEW: Merlin Music Inc. VSM-MX Speakers (2.59)
Posted by DBerry on 2005-07-28, 08:06:16 (209.162.225.226)
Model: VSM-MX Category: Speakers Suggested Retail Price: $9995 +/- various BAMs Description: Newest of the VSM loudspeaker Manufacturer URL: Merlin Music Inc. Manufacturer URL: Merlin .......

30: Re: Proper methodology and source music for setting up speakers? (2.50)
Posted by Bruce from DC on 2001-06-21, 16:29:42 (207.91.86.5)
Here's how I've done it, using a Radio Shack SPL meter and a test CD originally put out by Stereo Review and Chesky records that has equal level l.f. test tones from 300 Hz to 20 Hz. mount the SPL met .......

31: Concise, but not quite correct. (2.24)
Posted by RoyJ on 2003-08-07, 04:19:02 (216.229.35.254)
Audiographic's (Russ's) assertions about what constitutes a time-coherent design are concise, but some are too general, or he is a bit wrong in his interpretation of the math. Although my time is limi .......

32: RE: Clarifications on Time Coherence (2.23)
Posted by villastrangiato on 2012-03-14, 05:49:17 (76.24.163.170)
Roy Johnson said " I failed to communicate properly" No Roy, you communicated very well - citing an outdated AES paper from 1975 and clearly stating: "The nice aspect about using a first-order crossov .......

33: REVIEW: Escalante Design Juniper Speakers (2.15)
Posted by jonbee on 2012-09-30, 19:19:04 (98.225.22.34)
Model: Juniper Category: Speakers Suggested Retail Price: $7000 Description: 2+ way standmount Manufacturer URL: Escalante Design Model Picture: View Review by jonbee on September 30 .......

34: REVIEW: VonSchweikert Audio VR-1 Speakers (1.92)
Posted by FishMatisse214@aol.com on 2003-02-08, 07:45:53 (152.163.206.188)
Model: VR-1 Category: Speakers Suggested Retail Price: $995 Description: Reference Mini-Monitor Manufacturer URL: VonSchweikert Audio Model Picture: View Review by FishMatisse214@a .......

35: REVIEW: Green Mountain Audio Europa Speakers (1.37)
Posted by Dennisj on 2003-09-07, 08:52:58 (65.222.34.110)
Model: Europa Category: Speakers Suggested Retail Price: $880.00 Description: 2 way, stand mount Manufacturer URL: Green Mountain Audio Manufacturer URL: Green Mountain Audio Revie .......

36: REVIEW: Custom Designed Scan-Speak Monitors Scan-Speak Monitors Speakers (1.19)
Posted by jazzcan on 2006-03-29, 12:25:13 (198.163.45.18)
Model: Scan-Speak Monitors Category: Speakers Suggested Retail Price: $8,000 USD Description: 2-7 inch Revelator mid/woofers, 1inch Revelator tweeter Manufacturer URL: Custom Designed S .......

37: REVIEW: Chapman Audio Systems T-77 Speakers (0.85)
Posted by Doug Schroeder on 2006-05-21, 19:42:45 (72.131.17.99)
Model: T-77 Category: Speakers Suggested Retail Price: $10,000 Description: Floor standing 3 way dual port compression line Manufacturer URL: Not Available Manufacturer URL: Not Avail .......

Found 51 records in High Efficiency Speaker Asylum.

1: Re: POLL: Everyone's favorite speakers for 45 SET (9.11)
Posted by john on 2003-03-21, 12:31:32 (195.92.67.70)
For the last couple of months we have been astonished with a pair of Altec 604 8g's in very large sealed boxes (on long term loan). Amp Gordon's old 6bm8/45 circuit with NU.45's and Partridge TK7423 o .......

2: RE: 45 Amp Coming. Nearfield speakers/drivers Opinions ? (9.11)
Posted by DrD on 2016-04-05, 18:04:24 (69.79.26.112)
Here is a beauty shot of Oliver's Korneff 45 circuit. uses Tamura output and power irons from a Sony reel deck. perfect. .......

3: fusing HE drivers (8.72)
Posted by Dominic on 2003-05-19, 10:06:58 (66.36.143.24)
with the exception of pro drivers generally most High Efficiency have a fairly low power handling rating and if you, like me have more power than the driver is rated at, and it just so happens to be s .......

4: low power SET’s and 604’s (7.73)
Posted by billfort on 2006-05-16, 08:37:47 (204.191.240.150)
I can understand you being very attached to the Yamamoto, it seems a very desirable amp and I would love to hear one some day on an appropriate speaker. The problem is, that may be a real challenge as .......

5: If you think the 45 is great...... (7.60)
Posted by Salectric on 2014-02-03, 13:05:49 (70.91.92.18)
Just wait until you try a 46. The 46 has an output of a little more than 1 watt yet many folks find that not only does it sound better than a 45, it actually sounds more powerful. On my 98db speakers, .......

6: Re: Jensen Field Coil (7.34)
Posted by Steve Schell on 2001-05-09, 03:44:54 (209.179.234.92)
That amp circuit sounds like a recipe for really good sound. My favorite homebrew stereo amp uses a #26 voltage amplifier, transformer coupled to a #45 driver, transformer coupled to a single #45 outp .......

7: Truth is, I prefer a 45 -- as far as it goes... (7.05)
Posted by paul_s on 2003-12-15, 12:07:43 (207.167.100.251)
The 45 is so great for mids, given truly efficient speakers. But I could never get highs, lows, or grunt, even with the A7s. I find modern 2A3s to be the best COMPROMISE. My own 2A3s even run into (sh .......

8: RE: I'm running the KM30 SAG (6.55)
Posted by Paul Folbrecht on 2010-03-23, 08:50:19 (68.79.229.2)
That is good info! My front-runner has been the JE Labs SRPP 45 circuit which I seem to like. I don't relish the idea of using an obscure, NOS-only tube like the 10Y but would consider. I did not know .......

9: JE Labs 10y amps (6.21)
Posted by Jovy on 2010-03-23, 20:12:04 (124.104.151.71)
Hi Paul, His website shows a link, under "Shoptalk", to build the 10y, using the 300B circuit as a basis. VT25/10 tubes are plentiful and cheap on the market, compared with 300B's and 45's. I've had .......

10: Re: Been there- Jericho question (5.71)
Posted by nocturne on 2002-01-21, 20:12:54 (165.234.95.133)
Hi, If you are referring to the correction circuit for the midrange,I haven't tried it. Running the Jerichos with Paraglows, it does not seem at all an issue. I need to measure the response one of the .......

11: Re: best type of amp for complex speaker load? Henry Low SET question (5.67)
Posted by drlowmu on 2006-12-26, 22:00:17 (4.88.166.187)
Fred, If I were to do a amp supply today, it WOULD be about 1.30 to 1.35 times VAC equals VDC, and NOT .9 times VAC = VDC, as with a choke that meets critical inductance at 120 HZ, the classic definit .......

12: Re: Crossing a Lowther over to a sub? (5.54)
Posted by gilmorneau on 2006-12-17, 11:05:59 (207.200.116.133)
FWIW, I'm using a pair of Lowther Acousta's with PM6A's, and augment the bass with a single Klipschorn bass bin with a Stephens 103 LX2 woofer in it. Works great. Crossover/mixer is incorporated into .......

13: Re: Box Dims (5.54)
Posted by Tightwad on 2005-03-04, 12:51:09 (128.97.55.191)
>> Maybe it's time for a crash course in circuitry and just roll up the sleeves. Well, this is a good place to start, because it's an easy circuit and all passive, meaning there is no chance of electr .......

14: RE: Cerwin Vega V 36D In The House (5.49)
Posted by ka7niq on 2017-08-20, 10:44:10 (47.197.98.131)
Thanks Bill! The box is tuned to 45 hz, according to the CV poop sheet I will listen to see if the tweeter is being switched out of circuit with the switch, but they are very noticeably brighter, with .......

15: Re: Good bye Hi Fi - hello music (5.30)
Posted by Brian C on 2001-09-06, 10:51:42 (195.92.67.66)
Congratulations Rolf. You too have discovered that the pursuit of "HiFi" led to the same place where that bird ended up who flew in ever decreasing circles! I play drums and therefore I listen acutely .......

16: RE: Budget speakers for SET??? (5.30)
Posted by Rick R on 2012-05-29, 12:11:17 (108.225.228.199)
I just remembered my experience with buying speakers for a SET amp at a big box store. In this case it was Circuit City, may they rest in piece. They had a 30 day full return policy, so I bought a pai .......

17: RE: "Anyone Hear These?" Every Day Fot 15 Years! (5.16)
Posted by B. Scarpia on 2023-05-10, 14:56:28 (97.82.221.142)
Sensitivity is 97dB. For the first 10 years I used a single-ended, direct coupled, parafeed 45 amp with all the goodies: Magnequest Plate Chokes and OPT's, CCS, and a beautifully simple John Tucker ci .......

18: Re: TAD 2001 / 4001 / 4002 thoughts wanted (5.05)
Posted by Mike Bates on 2000-10-14, 09:32:57 (204.210.193.104)
Hi Bob, I'm using the 4002 without the 1.5 to 2" flange adaptor with a pair of Edgar 550 cycle round tractrix horns. The sound is extremely fast and with very low colorations. I'm driving them with a .......

19: Re: hey jim a! (5.01)
Posted by triodont on 2002-03-19, 08:09:54 (169.3.126.53)
..."I'm basically lazy..." hey jim, now you're speaking my mantra :) that 45 design sounds really interesting, though. i still love my moth but with the 90-92 dB speaks that i'm using i really need at .......

20: RE: edgarhorn titans (4.93)
Posted by Cut-Throat on 2010-04-24, 14:57:30 (75.161.140.162)
Joe, Have you tried a cheater plug on the amp, just to see if is a ground loop? This was my problem as I had a 3 prong plug pre-amp with 3 Prong Plug amps. My final solution was to lift the ground on .......

21: Beauhorn and Visaton Tweeter (4.82)
Posted by GGA on 2006-04-12, 13:44:10 (71.107.221.182)
I have Beauhorn DX4 8ohm 106dB Lowther speakers driven by Wavelength 2.5w 45 8ohm amps. I have added Viston TL16H 8ohm 100dB tweeters. According to Thorsten the Beauhorns are 102dB at 10k so sensitivi .......

22: Re: what is the best enclosure for these speaker drivers. (4.79)
Posted by BFitz on 2000-05-30, 11:55:09 (156.153.255.126)
Yes, Jeff - You got it! I have been studying the Linkwitz site. He has a really thorough explanation of the dipole subs, and a circuit to do the equalization. Nice part is his dipole sub to midrange c .......

23: Re: Thank you Tom, could have not said it better! (4.74)
Posted by Bill Fitzmaurice on 2003-07-29, 06:19:52 (152.163.252.5)
First, if you want good HF from a folded horn you have to use rounded wide radius bends, not 45 degree reflectors. I'm sure that you don't see how 1.6K from a folded horn is possible because you haven .......

24: Re: Hedlund horn amps (4.73)
Posted by Shanko on 2000-07-20, 18:47:40 (203.96.26.225)
To amplify (ahem) my previous comments; I didn't mean to imply that my 2A3 had insufficient power for the Hedlunds, you really do only need half a watt or so, I have had the room shaking and have NEVE .......

25: Re: SoCal Horn Group Mtg (4.67)
Posted by Steve Schell on 2003-10-14, 08:30:51 (209.178.154.22)
Hi Mike, Okay, let's see...front end is currently either a bone stock old AR-XA turntable with an obsolete but killer B&O MM cartridge, or my Phillips DVD/CD player. The AR joined the system recently .......

26: Re: caps-n-coils Suggest this series xover... (4.23)
Posted by Tim Moorman on 2003-10-13, 12:59:59 (64.12.96.9)
keto, Have a try at this circuit: http://www.acoustic-reality.com/ar-sxo2.htm This seems to work very well with less loss of detail than conventional parallel. Once you play with it, you catch on to t .......

27: RE: Speakers for an S.E.X. for a few hundred $ ??? Any chance??? (4.13)
Posted by DrD on 2008-01-20, 07:37:26 (76.88.54.203)
Terry, I likely would agree; those are fascinating alignments, however, this fellow has the SEX amp, and I can say that the SEX amp is a tad underpowered for the FE108 SADLY, because those two would b .......

28: RE: enough power? (4.09)
Posted by drlowmu on 2014-11-16, 10:19:06 (71.0.213.68)
DHT stands for "directly heated triode", an early / simple design where the filament was the tube's cathode. ( These tubes use a 4 PIN tube socket. ) Many consider these earliest of triodes to sound a .......

29: Not mine.. (4.04)
Posted by jpchleapas on 2005-06-26, 21:44:20 (68.162.247.162)
My tad td-4001 drivers are in 31" x 31" jbl 2360a biradial horns. I get no horn shout, and the sound is very smooth to my ears. Perhaps you heard them with ss amps? My 4001'se are the older variety to .......

30: Re: Any White Instruments Room EQ users here? (4.02)
Posted by drlowmu on 2003-12-14, 21:51:35 (216.74.200.204)
Hi Magnetar, I will add my two cents worth. I am an amateur, and not an engineer. ALL ACTIVE EQ's ( 4001, etc.) place the roll off components in the negative feedback loop circuit, and it doesn't matt .......

31: RE: My First High efficiency speakers and tube amps, advices please (3.89)
Posted by Paul Eizik on 2019-08-17, 14:45:21 (67.184.182.189)
About 15 years ago I heard the Fostex FE108Ez driver in the BK10 backloaded horn cabinet along with the T900 tweeter and I was impressed with the sound and value for the money. The BK10 was the smalle .......

32: Electrovoice SP15 in open baffle (3.82)
Posted by stereohifi on 2012-04-26, 06:19:00 (184.161.133.29)
Here is my last DIY project based on a 2 way design with EV SP15 -not the SP15A- and a coaxially mounted LPG neodium aluminium tweeter. I did bypass the ''brillance'' circuit out of the SP15. I use .......

33: Re: D123s in a Karlson? (3.80)
Posted by freddyi on 2006-05-18, 21:00:58 (24.197.68.161)
Qts should be around 0.3 for larger K and could be lower when vas is large. drivers of their day such as 604/EV15TRX are good. Eminence C15CX was good and only thing I could afford vs multiple Duplex. .......

34: RE: Phy Latest Iteration (3.77)
Posted by tubebuilder on 2010-12-18, 07:21:06 (58.106.32.15)
I cant imagine driving mine with a 45 amp and being happy with them. Over the years I have tried many many different amps that I have built. With my 0 feedback se amps they tend to sound lazy.I always .......

35: Re: Alert the Palace guards - Lackys are looking ! (3.61)
Posted by Deckers1 on 2003-03-27, 16:34:12 (63.163.136.154)
You people are pretty good reading to be sure. I haven't been to ALL the bars of course. But the finest system I've ever heard in a nice place was in Ft. Collins Colorado. "Washingtons". Better than .......

36: Specifics Here Now (3.60)
Posted by Weltersys on 2005-06-20, 21:26:33 (172.196.203.27)
Seas P 17 Coax with Vifa bass assist cone crossovers and cabinet tunings: + -----RP1-----C1----------C2----------- + ---------------------------L1---------RP2--- CoaxTweeter - ---------------------- .......

37: Re: TAD TD-4001 Passive Crossover Suggestions Wanted! (3.57)
Posted by Response34 on 2006-01-12, 17:53:30 (205.188.116.7)
Hello Mike, I have a pair of production speakers that run the TAD-4001 driver and horn. The TAD is crossed over at 760Hz where two 15" Usher drivers take over in a total volume of 14 cu. ft. (yes, b .......

38: RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's (3.55)
Posted by Paul Eizik on 2013-10-29, 12:45:29 (64.105.104.192)
Geary The Linkwitz-Riley XO comes from direct radiator land where it's useful to focus the main lobe radiated in a 2 way box speaker. In a rig like the Sentry lV, the mid and tweeter horns will domina .......

39: RE: uh-oh... (3.55)
Posted by Dan_ed on 2007-10-28, 07:30:47 (75.69.186.102)
Thanks for the help and compliment. The xover is indeed a series, first order. The 2441's are reversed polarity so they are connected black (+), red (-). I suppose that means they are actually not re .......

40: Re: Horn stuff and a post back for Tom (3.41)
Posted by Wayne Parham on 2002-07-09, 16:47:53 (63.52.150.43)
Hi Mark! You wrote: >> Upper referrs to the loudspeaker(s) covering the frequency range >> above the lower drivers. This could be the compression driver >> (upper) and midranges(lower), but could just .......

41: OT - DHT love fest (3.40)
Posted by Steve Schell on 2001-05-10, 12:00:53 (209.178.152.38)
Hi Fintail, The 26 tube is my favorite voltage amplifier. It was the voltage amp to permit AC operation of the filament, and was spec'ed briefly in many of the first AC radio sets. The directly heated .......

42: Re: Phase Shift (3.37)
Posted by Wayne Parham on 2001-03-22, 07:22:06 (208.152.96.45)
Hi Art! You wrote: >> There seems to be confusion about the amount of >> phase shift in each order of cross-over. This one's actually pretty simple. Phase shifts in reactive electrical devices. Here's .......

43: Re: More about killer amp. please... (3.26)
Posted by njjohn on 2005-02-13, 20:37:17 (205.188.116.7)
I'm starting to think that some pieces of gear have special qualities and we can hear the potential of something if it has special qualiites. I know someone with a pair of WE speakers and he has learn .......

44: Re: Horn stuff and a post back for Tom (2.93)
Posted by tomservo on 2002-07-09, 13:19:08 (204.87.188.226)
Hi Wayne Sorry for the delay, the holiday is over and there is work to do. I had a chance to take a high res measurement of the cube I had here which I have not scanned into the computer but will. Tha .......

45: Re: Karlson tube not Karlson box (2.85)
Posted by Wayne_Parham on 2001-01-31, 13:23:53 (165.122.133.210)
Hi Eric! You wrote: Hello Wayne >> My sumary is that the theoritical analysis and measurements >> of M. Popper seems to prove that a K. Tube could be compared >> to an exponential horn and provides "e .......

46: JBL 2226J in EV Regency cabinets, and then...? (2.64)
Posted by John Chleapas on 2001-12-18, 12:10:39 (64.0.99.137)
I am buying some vintage EV Regency speakers. How do these speakers sound for me to put in there? From the JBL Tent sale the 4648A-8 15" woofer which is 8 ohms, and 100dB efficient. At $220 something .......

47: Help to choose best bottom part (2.59)
Posted by LeBob on 2005-11-30, 21:48:30 (165.121.238.59)
Hello, I recently had a power surge related fire in my studio/workshop that contained my main listening audio system. I live in a hurricane Katrina recovery area with frequent power spikes and surges. .......

48: Re: Got pictures?? (2.56)
Posted by Tom Dawson on 2003-10-04, 00:49:18 (67.248.80.230)
I could take some shots but I don't currently have a URL to post them to. You ask about how I compensate the 2445J? It's pretty 'weird', actually but seems to work and the xover network has only one e .......

49: Re: Horn stuff and a post back for Tom (2.26)
Posted by Wayne Parham on 2002-07-09, 17:19:42 (63.52.150.43)
Hi Tom! You wrote: >> What your saying is correct then that the speaker, especially a >> point source direct radiator "moves around in time", it in effect >> moves front to back depending on frequency .......

50: Some light reading (2.12)
Posted by hulkss on 2003-04-25, 19:54:00 (65.25.198.210)
Recommended reading from http://www.interdomain.net.au/~bodzio/ [1] L.L. Beranek, ACOUSTICS, McGraw-Hill, New York. [2] P.M. Morse, VIBRATION AND SOUND, McGraw-Hill, New York. [3] E.R. Geddes, AN INTR .......

51: Re: Horn stuff and a post back for Tom (1.97)
Posted by tomservo on 2002-07-09, 19:07:54 (204.87.188.226)
Hi Tom! You wrote: >> What your saying is correct then that the speaker, especially a >> point source direct radiator "moves around in time", it in effect >> moves front to back depending .......

Found 19 records in Planar Speaker Asylum.

1: I popped the cover off to find the bad fuse. Couldn't find a bad fuse (6.06)
Posted by Green Lantern on 2013-07-31, 21:26:16 (72.220.145.238)
or hell even a good fuse for that matter. Here's why: (straight from Krell's operating manual for the KSA 200S): PROTECTION CIRCUITRY There are no fuses in the KSA . The amplifier is protected by a se .......

2: RE: Anyone here get that pair of Maggie 2.5 true ribbons for 600 plus shipping; just curious how they turned out? (6.06)
Posted by RickeyM on 2010-07-07, 08:25:25 (71.166.21.151)
I'm a little confused. You said they sound terrific with the tweeter resistors removed, but you said the tweeters were blown. If you're referring to the resistors in the resistor/cap network. Those ar .......

3: Re: ML owner - here is my amp specs per manufacturer (5.92)
Posted by DTB300 on 2005-02-10, 18:40:04 (64.72.198.129)
The amp I use was built by the designer as he needed something to drive his Apogee Diva's..... Here are specs per the manufacturer... In stereo operation power = 200 w rms / ch. Dynamic power / ch = 3 .......

4: Re: Active Biamp Maggie 2.6R with pro x-overs (5.74)
Posted by neolith on 2006-04-28, 21:36:44 (208.0.115.159)
I have never listened to the 2.6's so I can't say if biamping would be a good idea or not but I'm sure Mart can add his 2 cents. Looking at the schematic for the crossover a fair amount of modificatio .......

5: 1mm penetration is a 1D model (5.64)
Posted by Mart on 2001-10-09, 11:34:36 (198.26.119.84)
which doesn't account for axisymmetry & also doesn't account for material E & M parameters each field of which has independent permitivity & permiability. Although, this does give the engineer a ballp .......

6: Are you familiar with the Audio Circuit? (5.53)
Posted by E-Stat on 2007-01-27, 08:09:21 (206.255.203.68)
There's tons of advice over there about Acoustats. Andy Szabo, an engineeer and former manager of Acoustat has many an article about them. Here is his "C" Modification article. Here he states that thi .......

7: Re: ESL-57 protective circuitry Schematic (5.09)
Posted by drquad@pacbell.net on 2003-10-30, 22:43:55 (67.74.36.233)
Because the 57's rear grill jute backing obscures the area where Quad's protection board is usually attached, I don't know of a reliable way to see if one was installed (unless the jute backing isn't .......

8: Re: line source ribbon (4.80)
Posted by azryan on 2004-06-09, 16:27:37 (64.48.202.56)
All ribbons are 'planar' ribbons. The main diff. in the B-G planar is that it's attached on all sides. The Newform being a 'ribbon' is attached only at the ends and bows out to make the sound and is s .......

9: Re: I own 2 actually (4.80)
Posted by Peter Gunn on 2007-02-20, 07:54:47 (24.115.197.181)
I never owned a dbx unit but heard them once or twice. All I can say is they are not the RG unit, they don't work like the RG, they don't sound like the RG. The RG is "it" and any other brand is a ter .......

10: RE: The short answer is that ... (4.56)
Posted by zebraitis on 2007-07-29, 08:33:52 (209.254.56.131)
Andy, Thanks for the reply. I very much appreciate it. The 805 manual states: "You can connect speakers with an impedance of between 4 and 16 ohms. If the impedance of any of the connected speakers is .......

11: Re: Incidentally, they do NOT need lots of power to work well... (4.44)
Posted by sam9 on 2002-04-07, 16:00:29 (64.1.1.61)
Sounds like clipping. I've heard various advective to describe the sound. This happened when my MMGs were new and I wanted to hear what they would sound like with out a sub. The receiver was a 3 year .......

12: Best treatment? (take two aspirin and call me in the morning.) (4.03)
Posted by saucyworchester on 2007-08-13, 18:56:37 (70.233.136.39)
I have a great music room with one exception. The rear wall is 7 1/2' tall and 24' wide. The ceiling slopes up to 13' tall at 12' from the rear wall and then pops up to 15' and goes on up. The side wa .......

13: truth vs hype (3.90)
Posted by mac�� on 2005-03-31, 22:03:45 (24.16.51.162)
>>The UCD limits current draw to 15 amp. The H2O delivers 45 amp. You have to feed hungry speakers. If you live in the US your circuit breakers limit current draw to 15 amps. To illustrate some of the .......

14: The problem has been solved. (3.87)
Posted by Leisure7 on 2003-10-05, 15:59:10 (66.126.231.44)
The Beveridge Models 2 and 2-SW use built-in, direct-drive amps with 36KD6 output tubes. The tubes are coupled through capacitors to the electrostatic panels, which comprise conductive membranes and s .......

15: Effects of changing bass crossover capacitor type (3.57)
Posted by tom_gootee on 2011-06-12, 22:28:58 (66.87.7.51)
I thought that I should mention that even though changing the MG12/QR's bass crossover circuit's capacitor from a 50 uF electrolytic (with ESR of about 2.3 Ohms @ 120 Hz) to a 50 uF polypropylene (wit .......

16: RE: Triamping your 20.1s? (2.83)
Posted by Satie on 2011-11-23, 21:40:18 (75.179.183.41)
I hope it is that good, but my opinion is based on my listening to the parts, not of someone else's opinion of them. I do think the LM4562 is a great op amp. Many folks swear by it and it is the outpu .......

17: Re: Tact RCS 2.0 arrived...now what? (2.38)
Posted by Ronnhedh on 2004-06-09, 11:38:50 (81.225.115.91)
Actually there was a posting at the TacT audio user group today with similar issues which I answered. I thought it would be useful to copy my posting in this forum also. Since I have been using Magnep .......

18: Re: thanks! (2.21)
Posted by John R. Whittaker on 2000-10-18, 10:53:10 (134.139.221.34)
Arbelos, You've directed your message to "Rodger", so I'm confused as to whether it is a response to my post? I'll assume it is and answer. I'm sad to report that it appears that Rudi Blondia has remo .......

19: Interesting on conductors - and more :-) (2.03)
Posted by Beluga on 2007-11-03, 06:03:31 (80.212.252.213)
IN PURSUIT OF THE PERFECT CONDUCTOR by Dick Olsher (March 2001) Note: The is an abridged and updated version of an article originally published in the January 1996 issue of Fi Magazine. Most of the up .......

Found 1 records in Tech Square.

1: TV-2 tester (6.06)
Posted by Haber on 2006-02-07, 15:24:06 (70.224.190.124)
Hi I recently purchased this tester. After reading manuals I read There was a modification to improve rectifier diode test circuit. How can I be sure my set has this mod and what is the actual mod to .......

Found 181 records in Tubes Asylum.

1: 45 Amp (9.77)
Posted by OLLY on 2002-10-26, 04:00:08 (203.17.62.248)
Does anyone know where I can find a site that has a circuit for a circuit to build a 45 SE and PP amplifier. Thanks in advance. OLLY .......

2: Wanted!: Directly heated triode headphone amp circuits 45, etc (9.77)
Posted by uk5150 on 2002-11-16, 05:25:09 (194.117.133.196)
Hi all Does anyone have a circuit for a headphone amp that uses a directly heated triode such as the 45? All information would be appreciated, or even if someone can tell me if it is possible or not t .......

3: 45 AMP (8.24)
Posted by OLLY on 2002-03-08, 22:33:53 (203.17.62.158)
Anyone know of a site that I can find a good circuit to build an amp useing 45 output valves in push pull. OLLY .......

4: VT-52 or a 45 diy SE (8.12)
Posted by Joe on 1999-12-11, 19:41:43 (199.176.176.36)
I am seeking general advice from someone who has experience working with a vt-52 an a 45 diy single ended amp.I have a few of these tubes an thinking of building some amps but i don,t know how the so .......

5: RE: 45 triodes (7.94)
Posted by amioutaline? on 2012-05-24, 07:16:22 (96.36.85.71)
No to be argumentative, but... if you put different tubes in the same circuit and they exhibit differing tonal character, you can't assume at least some of that character might carryover to another ci .......

6: RE: Jackson 648 Roll Chart data to test #45 & #80 tubes. (7.60)
Posted by Paul Eizik on 2011-09-17, 11:13:34 (68.164.4.115)
D You can download the 648 operating instructions (all 7 pages of them) at the BAMA site for free. The 648 is a very basic "dynamic"emissions tester, and I would get a second opinion on a better teste .......

7: Well.... (7.57)
Posted by anumber1 on 2007-06-20, 06:21:33 (71.10.136.75)
...All of them! You do realize that the 45 is a low powered triode that is good for 2 watts or so, right? Bass and treble response are more dependent on the circuit and quality of the output transform .......

8: Re: Generally, would someone compare/contrast 300B vs 2A3 vs 45 (7.47)
Posted by Phil Sieg on 1999-07-29, 07:58:01 (198.144.162.51)
I think Jack's comments on the 2A3 vs the 300B are spot on. However, with the right speaker in the right circuit, I think a 2A3 can have controlled, tight bass. How low it goes is more a function of t .......

9: Re: Test results of 6C45-Pi vs. 417A / 5842WA (7.35)
Posted by Antonio Tucci on 2001-02-25, 06:27:38 (62.122.96.148)
Kurt, thank for your replay. Since I'll build a 45/2A3 SE-Amplifier (...but I have not decided yet the circuit), I'd be very grateful if you could give to me your scheme (relative to 45-SE amplifier) .......

10: Re: 45 Push-Pull Amps (7.33)
Posted by RobDowning on 2002-02-21, 21:14:44 (68.49.58.127)
I have one of those 45 PP amps that LarryI was talking about (I have modified it somewhat). Uses Acro 330 OPTs, has unbelievable bass and drive and still manages to retain the 45 magic. I also know so .......

11: Re: CJ mods (7.27)
Posted by David McGown on 1999-12-07, 10:07:36 (198.138.65.14)
If you are refering to the 45 amp built in a CJ MV-45, you are talking about a complete scrapping of the original circuit. I must admit that I don't have any particular fondness for the MV-45, since I .......

12: Re: Winner in Supratek Cortese Rectifier Sweepstakes... (7.11)
Posted by SETdude on 2003-08-08, 03:31:37 (63.183.168.145)
The 6106 is my fav in my Korneff 76/6SN7 pre. In the 45 amp I like the 5U4G. Give Jeff a call about building a 45 amp. He builds an excellent one IMHO. The EML solid plates are my tube of choice in it .......

13: Re: Military I-177 tester- same test criteria as Hickock 533A? (6.99)
Posted by Chris Haedt on 2004-07-29, 16:20:43 (165.121.212.10)
The short answer to this question is that both the 533A and the I177 have the same expected value of 1850 for a type 45 tube--so the results from the two testers may be directly compared. My research .......

14: RE: 45 triodes (6.78)
Posted by SETdude on 2012-05-24, 06:58:40 (69.242.251.160)
All tubes are circuit dependent. .......

15: Re: Gassy Tube Baking (6.76)
Posted by Chris Haedt on 2004-03-07, 11:59:39 (165.121.212.141)
Since my name came up I will chime in here. The grid current test on the TT1 is excellent--but some testers tend to be too sensitive. The 12AV6 tube in the tester is part of the grid current circuit a .......

16: Re: Thanks, Tom - I've been eying that software for a long time. (6.62)
Posted by Tom �. on 2000-03-02, 15:06:29 (205.175.225.22)
>>I'd rather be playing with tube circuits on the computer. I must warn that it is addicting. You get parameters set up for a certain circuit with a tube and you then ask yourself "hmmm....what would .......

17: How do you implement a CCS in the plate circuit of a 45 output? (nt) (6.42)
Posted by Jim A. on 1999-12-06, 10:13:17 (167.132.64.195)
(nt) .......

18: Re: recommend a first SE triode circuit? (6.42)
Posted by Seth Hensel on 2001-04-06, 12:08:18 (209.69.13.113)
Dr.P - I am having a ball building a version of Roscoe Primrose's 45 amp. This is a direct coupled design using a 417a as a driver. The parts count is low and the relationships between the various ele .......

19: Re: One more thing to add... (6.40)
Posted by JohnR on 2001-07-02, 17:17:52 (216.39.152.139)
Ah, I was wondering about that... Isn't this circuit similar to Phil Sieg's "bridge" 45 in the current Valve? .......

20: Re: Dht driver tube for 45 (6.38)
Posted by Kurt Strain on 2001-01-24, 08:59:50 (156.153.255.114)
Jeff Day and Gordon Rankin worked together on a custom 45 SET for Jeff. They tried some AVVT driver tube for the 45. It was a nice sound, but both eventually preferred a WE437 driving it. The DHT's ar .......

21: Re: Maybe but read (6.35)
Posted by andy evans on 2001-04-17, 14:56:02 (195.44.6.76)
These are quite different tubes but share the same base (9a), so they can be put in the same sockets. Results will be totally unpredictable unless you understand the circuit. Remember they draw a litt .......

22: Re: Any good 2A3 Push pull amplifiers outhere? (6.26)
Posted by tcain on 2003-08-18, 11:10:19 (66.97.93.222)
I really like mine. >>This makes me wonder if the 2a3 in push pull mode retains the magic of its SET ==Not in my experience. >>Are there other 2a3 push pull ampsout there that sound as good as a 2a3 S .......

23: many of them... (6.18)
Posted by Sector-7G on 2004-10-19, 18:35:18 (130.203.164.218)
and all them individually dependant on a well engineered circuit and parts selection, just like the 45. regards, Douglas ! Beware the man who behaves deceitfully towards others, for there is nothing e .......

24: Re: 2A3 vs 45 S.E.T Amp (6.15)
Posted by Nigel on 2000-01-21, 10:38:55 (24.188.130.45)
Obviously Ron has a reading comprehension disorder of some sort. Let's hope his own personal "circuit boards" can be re-soldered. Cheers. Nigel .......

25: Re: 45 Push-Pull Amps (6.11)
Posted by Gerry E. on 2002-02-21, 11:20:22 (164.57.254.209)
Todd: For a short time last year, I owned a PP #45 amp. It was built by old-timer Ed Duda (of Lafayette and/or Harman Kardon fame) and it was a really wacky design (amongst other things, it was built .......

26: need EL34 biasing help (6.02)
Posted by driver8 on 2003-06-18, 13:15:12 (132.208.142.225)
I recently purchased a pair of Halo Audio SPM8 monoblocks wired in SET mode. I was told that the bias for the EL34 in this amp should be around 380mV. I cannot bias lower than 500 mV (tubes are new). .......

27: Output Transformers...any favorites?any gems? (6.00)
Posted by ChristopherC on 1999-09-05, 10:42:29 (207.148.137.187)
Hello, I've ordered Hammond 125E OT (universal ot) for my DIY Amp. I've fd 2 people on the net who use them (-more?) http://www.geocities.com/TimesSquare/1965/jeremy.html 45/2A3 single ended amp based .......

28: Re: Marantz 10B Question (5.99)
Posted by Gene on 2000-04-09, 15:02:28 (209.151.240.192)
I have a 10B, and I have a "station drift" problem also. However, it's never been enough for me to have to re-tune. I also have to wonder about how the photocell design, (A well-known problem, the pho .......

29: RE: 45 triodes (5.92)
Posted by SETdude on 2012-05-25, 05:13:14 (69.242.251.160)
Yes, to a degree but much can depend on the driver tube too. In the end, personal preference is what you end up with in the world of tubes. Being dogmatic is a mistake. Same circuit different speakers .......

30: Where can you get a 6H30--pi (5.92)
Posted by Joe on 2001-01-24, 10:34:19 (4.17.246.245)
Hi Kurt And thanks,you don't build a high quality 45 amp everyday.What is this 6H30 tube and where can you purchase it.I have enough 10Y's to use for a driver or maybe i can use a 45 (decisions- deci .......

31: I" do not buy the argument given by the guy below" (5.92)
Posted by Allen Wright on 2010-03-26, 07:32:14 (83.78.93.102)
due to circuit. tube circutry of PP EL34 amps had been around over 70 yeears, chinese had been making PP amps for over 70 years though.... if you wish I can forward a link contains over hundreds of a .......

32: Boy, you guys firing me up only plenty! (5.84)
Posted by Poindexter on 2001-07-05, 21:51:06 (166.122.62.49)
I've wanted to build one of these things for years, now. With what we now know about speaker and circuit tech, what a console it would be! Can you imagine PP 45's playing into Fostex 168's in a box li .......

33: 45 vs EL34 (5.83)
Posted by Fullrun on 2005-02-28, 11:09:19 (68.36.46.10)
I know that this is not only a real apples and oranges question, but also almost impossible to answer beccause it is so dependent on the individual circuit. But for those of you who have heard these o .......

34: Re: Bad Tubes and Bad Amp Design (5.78)
Posted by Ivan303 on 2002-12-11, 21:34:13 (12.72.138.123)
I don't think we really disagree. The 45 is one of my favorite sounding tubes as well. Parafeed with Magnaquest Cobalt output tranny's and a 76 as a driver, HEAVEN. Best sounding tube is perhpas the V .......

35: Re: Tube testing (5.65)
Posted by Gary Kaufman on 2001-08-21, 15:14:01 (155.41.71.177)
Since most testers are at least 25 years old, maintainance and calibration are important. There are still a few folks that do wonderful work. Remember that your +/- $250 purchase of a TV7 is only the .......

36: Re: 45s and 50s (5.60)
Posted by Old, gray and definitely in the way on 1999-05-21, 16:29:30 (207.65.168.7)
Power triodes...predecessors of the 2A3 and 300B. Originally globe type (AFAIK that's the only form of the 50), later 45s are "shouldered" tubes, like most of the triodes we are used to seeing. In a D .......

37: Re: Did you try the SBE 716 caps?. . (5.59)
Posted by pp-45 on 2002-05-01, 06:56:53 (24.118.18.240)
I tried the .1 600V 716P (circuit called for 400V). They sound a little harsh, everything seems to improve over the old original caps in the amp but it sound too "hi-fi". Don't know how to describe it .......

38: RE: 45 triodes (5.52)
Posted by Yadaday on 2012-05-24, 22:18:24 (173.57.107.16)
"No to be argumentative, but... if you put different tubes in the same circuit and they exhibit differing tonal character, you can't assume at least some of that character might carryover to another c .......

39: Re: Scott 296 at $760 on eBay. 2 days to go (url) (5.47)
Posted by Struan on 2000-04-25, 17:47:47 (206.47.244.62)
One time I was so mean that I passed up a dog eared one for about $225USD. That was about 4 years ago and I was more interested in selling than buying even more vintage. The 296 (1962) is the last Sco .......

40: Re: Correction (5.46)
Posted by JLH on 2001-02-28, 10:08:03 (198.186.64.48)
-3dB, I wanted to jump in here and clear up some confussion. The parameters I was running the 5842 under was Vp = 135V Ip = 15mA and Vg = -1.5V. The power supply used was a 150V source, but after you .......

41: Re: And the winners are.... (5.44)
Posted by bean_counter on 2000-03-31, 06:34:41 (208.40.47.124)
I'll second the CX-345 and UX-245 opinion - even in my el-cheapo SE 45 "breadboard" amp (all scavenged or cheeeeep parts), I had the similar results. Cunningham was best, incredibly transparent, and t .......

42: Not necessarily (5.43)
Posted by Steve O on 2024-12-02, 15:33:26 (23.125.184.79)
I worked on a couple of jukebox amps of the 78 and 45 era. Both amps powered down after play was complete. The 78 amp used 100% directly heated tubes and was ready to go from a cold start in a few sec .......

43: Re: Circuit topology and output tubes. Audible differences? (5.39)
Posted by fujidev on 2003-11-24, 19:20:19 (63.231.22.112)
Take a look at: Angela instruments and JE Labs for circuits on SE amps. Look at Plitron.com for advanced designs of SE and PP amps. Tubes make a huge difference. Read about the differences in 45, 2A3 .......

44: Re: 6SN7EH 'grit' (5.39)
Posted by Jimmy on 2005-06-02, 11:41:07 (207.118.233.84)
Jim, I guess the 'gritty' post answeres my post. It just depends upon the circuit. Case in point- the Sylvania clear mica 'Y' plate outperformed the Sylvania 'T' plate in just one application in a ser .......

45: WAVAC Audio Lab uses the 805 (5.30)
Posted by Jim Ricketts on 2002-08-12, 03:37:25 (67.233.192.217)
transmitting triode in 2 Single-Ended triode models (Class A circuit with no coupling capacitors) producing 45 and 55 w/ch in each with only 1 output tube per channel. ------------ Jim Ricketts tmh au .......

46: Re: check out Fender schemo site (5.29)
Posted by steven oda on 2002-11-21, 14:59:26 (24.205.9.247)
This site, along with Teagle & Sprung's "Fender Amps" book can help you narrow down the circuit and speakers of Fender's many 45-50 watt amps which you are after. .......

47: TV-2 tester (5.29)
Posted by Haber on 2006-02-08, 19:43:14 (70.224.190.105)
I recently got one of these fine testers. After reading manuals I discovered a mod to improve rectifier testing. It is govt number MWO 11-6625-316-45/1 and 2. I can not determine if my set has these m .......

48: RE: KT-90 vs. KT-88 Bias? (5.26)
Posted by Jim McShane on 2011-08-18, 06:17:19 (76.16.144.26)
I think you need to take a step back for a moment. 1. The small difference in bias between "45 mV" and 55 mV" (which I'm assuming means 45 ma and 55 ma across a resistor) won't affect tube life very m .......

49: I have Sylvania 6SN7W metal base that fit into this... (5.21)
Posted by PeterI on 2010-08-12, 11:44:06 (67.177.199.174)
category. They're JAN 6SN7W chrome top, w anchor. They sound great in circuit but test on the low side, 68/90 and 45/86 on a trustworthy Eico tester. I don't feel right selling them, (and I've sold .......

50: Holy @#$%! (5.19)
Posted by Tom �. on 2000-03-30, 19:30:09 (209.181.212.32)
@ $40-$45 per tube, I'd rather rework the circuit than sub in a tube that has a lower plate dissipation rating than the 12AU7 plus a higher gate to anode capacitance. Just a friendly warning, the 6085 .......

51: 6L6GC to KT66 (5.18)
Posted by TubeAcolyte on 2018-07-11, 16:20:10 (76.66.133.130)
Hello, all! I had a couple of questions. I guess it's more an exercise in loose theory. Forgive me if I'm out to lunch - I'm ready for the slap of the the educator's ruler. I recently became an owner .......

52: Re: Tube tester basics (5.17)
Posted by sgmlaw on 2003-09-19, 10:47:40 (64.0.80.130)
Testers are instruments, just like the equipment they help support, so they should be themselves tested, calibrated and reconditioned as necessary, particularly the older models. A tired electrolytic .......

53: Re: Cary 805C users -- Please give advice !!! (5.17)
Posted by Jeff Day on 2001-10-27, 08:40:36 (12.73.171.152)
Hi Eric, I have owned the 805C and also listened to the 805B at length: they are both good amps, and sound pleasing, but are far from the level of performance possible from an SET design. Your B will .......

54: Re: Best 30 watt tube amp under 1000 Used or new (5.15)
Posted by Ross on 2006-08-30, 12:35:04 (70.144.59.193)
You mention that you have a ST-70. Is it stock ? Has it been rebuilt ? Any parts or circuit changes ? A ST-70 rebuilt to stock specifications is a very nice amp that gets you to point of diminshing re .......

55: If power is a concern (5.15)
Posted by paul_s on 2004-05-19, 09:53:19 (66.63.129.7)
The Sovtek can double the RCA's output, in the right circuit, if that's a consideration for you. I find that the Sovtek is more extended on both ends, has more grunt, even at the lower bias. But for m .......

56: 5Y3 and 5AR4 (two other questions: 2A3 and 45 compatability; 2A3 power output) (5.14)
Posted by Jacha Heifetz on 2007-06-14, 16:45:23 (71.126.132.54)
I have a conundrum... I'm going to order backup tubes soon for all my stuff, but there's one slot that's got me scratching my head. The Antique Sound Lab MG-Head OTL32 DT is tube-rectified; this tube .......

57: Re: Tech question on tube spec and tube life (5.14)
Posted by Jim McShane on 2000-10-04, 07:42:25 (63.252.135.4)
Ian L. wrote... "Recently I've had the opportunity to check out two pairs of AVVT 2A3 mono plates on the Paraglows . One pair has a max Ip rating of 80mA and the other pair is at 45mA " I think you're .......

58: Re: Thanks Phil. (5.14)
Posted by Doc B. on 1999-07-06, 08:17:41 (209.20.171.26)
Oh a 2A3 or 45 can handle a 15" woofer fine. Just has to be the right circuit, and the right woofer. But what I really want to say is check out Steve Bench's concept of inverted operation for a direct .......

59: Re: tube input.. (5.13)
Posted by Jim Carlon on 2002-07-19, 17:11:08 (209.240.222.132)
Yes, the 16mV I referred to was RMS, which is about 45-46 mV P-P on the scope. As I said, I'm not sure why Fender specified this, it seems like an odd value to choose. Also, I guess I should add that .......

60: Any sustitute for a 6az8? (5.11)
Posted by MIrving on 2007-07-24, 06:03:03 (71.76.63.101)
Hello I am in the process of upgrading a Knight KU-45 Miltiples amp and need some help. In the multiplex circuit there is a 12AT7 and a 6AZ8 tube. The 6AZ8 is an odd duck and I am looking for any poss .......

61: Re: Experiments with "UltrPath" connection (5.10)
Posted by DrM on 2001-03-06, 19:22:44 (208.201.224.36)
Hey Kurt, > The 45 circuit uses "excessive" capacitance, but it did not power a > problem with the well filtered RCLC PS filter. Isn't your PS really a RCLCL filter, with the plate choke also acting a .......

62: Old Production 7591As . . . (5.05)
Posted by sgmlaw on 2009-03-19, 13:33:57 (98.140.124.26)
. . . are really tough tubes. That they have held up so well for so long in some of these hot circuits is potent testimony. How many JJs or EHs do you think would endure that well in a bone stock Fis .......

63: Re: What do you consider as an excellent tube for preamp/drivers (5.00)
Posted by Adrian on 2000-11-04, 05:06:45 (203.198.12.136)
A lot depends on the circuit. An excellent tube used in the wrong circuit will sound worse than an average tube used in an excellent circuit. Those tubes mentioned all have very high transconductance .......

64: Bad Tubes and Bad Amp Design (5.00)
Posted by Jeffm on 2002-12-11, 20:20:58 (172.167.158.51)
I have heard 845 amps that had different driver tubes but I haven't heard the 845/45 combo before so I can't really comment . . . But I have heard poor tubes make a really good amp sound really bad an .......

65: 12AT7 vs 12AX7 in Voltage Starved Circuit Application (5.00)
Posted by Greg Ewing on 2005-01-03, 16:11:20 (199.33.79.4)
I have a Paia Tubehead preamp that uses a pair of 12AX7s operating at 45 volts to starve the tubes into sounding VERY tubey for a guitar preamp application. I read that swapping the 12AX7s with 12AT7s .......

66: Re: Geez guys! (4.99)
Posted by Richard A. Conte on 2000-04-06, 10:15:11 (198.133.22.66)
Hi folks, What I've been trying to determine is if a 2.5 VAC filamant supply can run 300B's in a DC Coupled circuit ala, 6385's driving... The 2A3's and 45's work great at 2.75VAC and the 300B's sound .......

67: Re: 45 bloat? not 4 me (4.98)
Posted by LarryI on 2004-10-18, 07:45:17 (65.205.15.210)
As I said, I love 45s. In comparison with a 2A3 in amps that are virtually identical, save for optimizing the circuit for each respective tube, I found 2A3s to be leaner sounding. That's all that I me .......

68: RE: re-tubing Ming Da 34AB (4.98)
Posted by suggestion on 2010-03-26, 06:43:08 (135.245.8.2)
did you upgrade the coupling caps? if not, this will be first step to considerably improvement for this amp. I do not buy the argument given by the guy below due to circuit. tube circutry of PP EL34 a .......

69: Re: Sorry Jim (4.90)
Posted by Jim McShane on 2000-10-07, 10:37:26 (63.254.248.127)
First off, no need to apologize! Second, why is one tube's cathode current higher/lower you ask? It's a question of construction tolerances, such as... 1. Accuracy of control grid winding 2. Distance .......

70: Re: WHICH IS BEST 2A3 amp ????? (4.87)
Posted by TC Wu on 1999-09-11, 11:25:13 (128.248.127.114)
I'll offer my 2 cents (strategy) here since I don't believe there is such "best 2A3 amp". In addition to the circuit and technical aspects, I tried to talk with designers, before my purchase, specific .......

71: Re: Hickok 539C gas testing (4.85)
Posted by Chris Haedt on 2004-05-14, 14:49:08 (165.121.210.117)
I just tried to test a 45 on my 539C and it did the same thing. I really don't have an answer for you on this one. The theory of the Hickok gas test is that you are biasing the tube until it is nearl .......

72: How do I add a second set of outputs to a preamp? (4.85)
Posted by Mike B. on 1999-11-27, 10:03:05 (209.181.54.186)
I just picked up a used Quicksilver tube line preamp. It only has one set of outputs. I am trying to run a set of subs with internal amps and the main speaker amps. I talked to Mike S. at Quicksilver .......

73: Re: Smaller transformers sound better or worse? (4.81)
Posted by BobC on 2000-03-24, 05:12:41 (151.202.88.143)
>I have a pair of big Peerless S-275-A push-pull OPTs with 845's driving them and it's >good, but not as transparent as the little SET. That OPT has about a mile of copper >wire in it (and that's not .......

74: RE: "Snap" in one channel of Conrad Johnson MV-50 amp (4.78)
Posted by ronaldw441 on 2010-03-03, 17:54:11 (71.33.209.92)
Yes, the flashing is normal. I have a MV-45, a MV-50 and a MV-55. They all do it. The led circuit is just a voltage comparator that monitors the voltage across a 20 ohm resistor wired between the cat .......

75: Re: cj mv-45 pre-amp/speaker recommendations (4.75)
Posted by tvr2500m on 2003-09-15, 16:53:18 (209.6.113.23)
Matching gear for the MV-45? Looks like you're building a nice, smaller, high-value system. I think you've got LOADS of good choices these days. For preamps, I'm most familiar with the CJ preamps. Yes .......

76: Anyone seen this topology in an amp before? (4.64)
Posted by Kurt Strain on 2001-06-30, 20:19:29 (209.204.136.148)
This is a parafeed single-ended input stage to a transformer phase splitter to a "parafeed push-pull" output stage. Notice there's no need for a center tap. I would love to try this if I only had an .......

77: Re: Excuse me, but the Zen IS NOT a triode amp!! (4.63)
Posted by Paul Joppa on 1999-09-19, 22:42:43 (216.39.159.41)
There are certainly claims made that only direct-heated pure triodes can give the true ultimate sound. Almost nobody offers a plausible reason. The claims are I believe based on a relatively narrow ob .......

78: Re: sencore mu150 continental (4.58)
Posted by Chris Haedt on 2003-09-15, 17:12:15 (216.40.164.239)
That is an excellent tube tester--but quite difficult to restore/repair. The circuit design is unique, a square wave grid signal is used, and the bias on the tube under test is set automatically to ac .......

79: Re: Mikie now I get great sound from made in China KT88... (4.50)
Posted by tubecrazy on 2005-11-08, 08:51:25 (65.151.94.209)
I was REALLY surprised when I first heard a quad of the solid plate Chinese KT88s. They did not sound like the old KT88s I had heard, in a GOOD way--- I always wished for a tube that had TungSol 6550 .......

80: Re: Counterpoint SA2 User Manual wanted (4.49)
Posted by AJ on 2005-01-03, 16:39:44 (198.81.26.7)
Well Kudos to Mike Elliot for keeping old Counterpoint gear alive. I still have my SA-2 that I bought new in 1983. But $45 for a manual that tells you no more than what is intuitive from looking at th .......

81: Re: Chinese business ethics..... (4.48)
Posted by -Steve on 2001-06-09, 19:37:59 (4.54.79.213)
I recently purchased a pair of TJ globe meshplate 300Bs from Brian Cherry at diyhifisupply, and the transaction went smoother than buying a DVD player at Circuit City. Brian's a class act. BTW, the Me .......

82: Re: Lucky you! (4.47)
Posted by Ivan303 on 2005-04-18, 19:03:32 (12.72.182.216)
Sounds like a great project. Please keep us informed when you get them. The 845 amps I'm building (or have been procrastinating about building) is basically the same circuit as Ed Sawyer's ElectronLuv .......

83: Re: Excess line voltage can kill an amp (4.46)
Posted by Chris Haedt on 2003-11-02, 04:09:37 (216.40.163.132)
Meter impedance refers to the load the meter will place on an AC circuit. With analog meters, this is usually referred to in ohms per volt. Older meters were typically rated at 1000 ohms per volt, whi .......

84: Re: Interstage transformer (Tango NC-20) (4.42)
Posted by dave slagle on 2001-03-07, 12:26:02 (165.247.36.155)
hey, the whole name game thing is funny, most of the 80% nickels are actually 79%... and there are various different trade names, but i am pretty sure "permalloy" refers to 80% nickels super 80 is jus .......

85: not until you check with the manufacturer (4.42)
Posted by TrustYourEars on 2013-07-27, 16:13:38 (66.217.176.165)
Good advice from skriefal. I don't know the equipment BUT given the usual hi voltage of @ 450V, the bias current for EL34 & KT77 will range from @ -35 to -43V. For 6L6 the bias voltage range will be @ .......

86: Re: Why not more new EL84 based amps? (4.41)
Posted by Jeff Day on 2006-01-27, 08:44:46 (68.118.221.147)
Great thread! I recently discovered EL84 amps and am very much impressed with what this tube can do. I've primarily focused on SETs like the 45, 2A3, 300B, 845, up until now - and they each have their .......

87: Re: CJ Premier 11A (4.41)
Posted by Awe-d-o-file on 2004-03-27, 10:21:41 (170.215.145.105)
http://tdsl.duncanamps.com/show.php?des=12AX7 http://tdsl.duncanamps.com/show.php?des=5751 This explains the differences in these tubes. I reccomend you find some good 5751's as there are differnces a .......

88: Re: swapping for Jolida.... (4.39)
Posted by danlaudionut on 2005-02-08, 09:13:51 (205.188.116.7)
greygl I have a Jolida 202 - only difference is the 303's EL34 OP and bigger transformers. Try a NOS 6072 in the first position (they like the SRPP circuit- see Bugle 45 schematic). And a NOS 12BH7 in .......

89: Re: Yeap you are right... (4.37)
Posted by Ed Sawyer on 2004-09-16, 17:05:43 (24.34.46.96)
Forget 6L6 - boring, everyone and their brother has been-there-done-that, the good ones are expensive, and it's still not a triode! use the HK24s as front end for something cool like 45, 845, GM70, et .......

90: Re: Hey Scholl – PP 6B4G update B-Counter may I have details? (4.37)
Posted by bean_counter on 2001-02-19, 20:31:52 (216.214.206.185)
**what's the p-p Z on your output transformer?** either 6k or 6.6k, I've been told both. **How much power do you think this amp does with 320v B+?** I imagine I'm in the 8 watts output range; can go a .......

91: I get no music out of mynewly built amp (4.30)
Posted by DAK on 2016-10-17, 19:12:52 (141.239.172.61)
I just built a SE kt90 amp with 6j5 driver tube. The amp uses fixed bias. I guess i have 2 problems. first my bias voltage is not able to go low enough to get the power tubes to their proper cathode c .......

92: Re: VTL MB-250 (4.23)
Posted by Joe Rosen on 2000-02-29, 18:01:46 (205.188.193.38)
Dear Vic, Here is a vote against. It is not on sound quality grounds, you either like these things or you don't. I'm glad the other two gents found their VTL's reliable, I've seen plenty that weren't. .......

93: Re: EL34 to 6L6GT (4.21)
Posted by MIchael Samra on 2006-01-26, 02:17:01 (66.188.56.2)
Dave Thats an excellent choice using the 6l6gc in the dynaco st70 but you cant drive them to full power unless you mod the grid circuit of the outputs so the 7199 can swing more AC.The best thing to d .......

94: Altec 128b vs. Altec 1568a? (4.19)
Posted by wpod on 2002-02-19, 07:29:46 (64.12.107.26)
Greetings-I am considering puchasing a pair of the above mentioned monoblocs, however I'm confused as to the differences between the two models. They both use basically the same circuit(two 6cg7s, two .......

95: Yes and no... (4.18)
Posted by Phil Sieg on 1999-10-30, 13:02:39 (198.144.160.7)
There are variations on the SET theme, but you right in part. Class A is part of the attraction. But it's also the character of the output device. True triodes have a quite different sonic signature t .......

96: I'm not normally a fan of solder- slingers, but... (4.16)
Posted by Dave VH on 2000-03-15, 15:46:40 (63.194.80.83)
Sorry, that was an inside joke. Actually, I'm looking forward to doing some mods my self later this year, and your approach is one I had been wondering about. It seems to me that even with 2A3 and 300 .......

97: Cathode or Fixed Bias (4.15)
Posted by steven oda on 2003-02-20, 10:59:45 (24.205.15.153)
Peter, If the amp has cathode bias resistor, usually 5-10 watt range tied from pin 8 to ground---then DROP the resistance from 220 ohms to say 180 ohms. This will increase the idle bias, for Cathode B .......

98: Use the 65 instead (4.14)
Posted by Victor Khomenko on 2000-05-12, 05:46:15 (216.158.42.31)
***What do you think about the noise or the sounding of nuvistors (for eg., Russian 6C62H) in the first stage ? That doesn't seem to be a good tube for the first stage, in my view. It has several time .......

99: RE: Tube recommendations- What is best? (4.12)
Posted by Michael Samra on 2011-02-13, 15:21:04 (97.84.132.158)
Mechans If Neff was talking about the 12au7s in amplifier applications,I concur with a lot of his thinking because in almost every application I have seen,changing the 12au7 to a 6cg7 is a marked imp .......

100: thinking about single ended (4.12)
Posted by elektron on 2006-01-24, 13:02:35 (148.78.243.24)
Jim, hi. I think it is not a question of bad or good but what might be optimal. In my experience the Single Ended Triode directly heated offers shading, immediacy, and delicacy that are strikingly dif .......

101: RE: Westinghouse 6GH8 (4.11)
Posted by tubos on 2009-06-05, 05:59:00 (96.234.46.168)
While Westinghouse in 1963 might have actually made your 6GH8 tubes, their receiving tube production ceased in the mid-1960's. Most tube makers cross-sourced tubes - one company would have a product .......

102: Re: Thanks Chris! One more question if I may. (4.10)
Posted by Mechans on 2007-02-18, 11:39:52 (68.46.108.249)
I am not Chris. I will not tell what to do. However leaving an expensive tube like a 300b burning 24/7 is going to use it up. Balance that against the excessive wear and tear of turning your amp on an .......

103: RE: 83 ? (4.09)
Posted by Neff on 2009-08-31, 09:18:37 (68.246.201.145)
The 83 tube will have less voltage drop vs a 5U4 type tube. If the load is minimal such as a 45 amplifier, perhaps a difference of 20-25 volts would exist. The 83 tube also performs simular to a regul .......

104: Bought some questionable Amperex's from eBay? (4.08)
Posted by MM on 2003-03-16, 20:35:17 (68.164.125.38)
These 4 Amperex long plates were all bought from the same auction on eBay and they all tested poorly: Tube 1: 45/35 Tube 2: 33/62 Tube 3: 60/36 All the above showed no short. Tube 4: 35/65 and failed .......

105: Re: Chinese KT-66 in AE-25 Superamp? (4.07)
Posted by Chris Spafford on 2002-09-27, 12:35:18 (66.227.208.144)
Check out the JJ E34l as suggested. The Tesla is indeed the best KT88; I like it as well or better than all but early 1960s GEC British KT88s. Don't dismiss Tung Sol 6550s or Mullard XF2 EL34s if you .......

106: Hybrid MOSFET/Tube Amp (Class AB) (4.04)
Posted by stephenwmoore on 2002-08-27, 14:15:14 (12.47.224.12)
I'm interested in building several channels of hybrid amps for my recently built Linkwitz Phoenix speakers (www.linkwitzlabs.com). I want a MOSFET power stage and a tube driver stage. I found a schema .......

107: Don't do it ? (4.00)
Posted by Bambi B on 2007-09-10, 21:46:45 (70.239.150.6)
Mywing, The Audio Research SP10 has a complicated muting circuit probably just for the purpose of countering the reasons it's not a great idea to change tubes without turning it off. As you know, when .......

108: RE: 2a3 and 300b (3.99)
Posted by David Lawrence on 2014-07-23, 14:31:01 (24.111.65.90)
Well, I'll defend the 300b. I have owned and heard a number of amps that work with both, and for a long time was listening primarily to SET amps. For both SE and PP it all depends on the implementatio .......

109: More Experiments With UltraPath - Eureka! (3.97)
Posted by Kurt Strain on 2001-03-07, 11:43:20 (156.153.255.114)
I did some more homework on this and with the help of pp man and Thorsten's explanation it finally became clear to me what's going on and what to expect. pp man's explanation to me as told to him by T .......

110: Re: cryo tubes (3.97)
Posted by Ivan303 on 2002-12-11, 20:38:29 (12.72.138.123)
Ed, Yours is the third amp of Josh's that I have heard and it is my favorite, as it will drive normal speakers and retains the sound of the driver tube better than any amp I have heard. Many will tell .......

111: Re: 2A3 vs. El-84? (3.93)
Posted by Sans Nom on 2000-07-27, 10:41:34 (195.242.79.21)
Aside from the differences in circuit topology, driver tubes used, operating parameters, components used, etc. I guess it also boils down to the following matter: IDHT (Indirectly Heated Triode) vs DH .......

112: Some thoughts... (3.93)
Posted by Phil Sieg on 1999-08-24, 06:28:09 (198.144.162.3)
Lower power does not, in itself, necessarily mean lower parts count and/or more "refinement". Parts count is related to how the circuit is realized, particularly how the driver stage is coupled to the .......

113: Re: Dynaco question, popping noise, can cap,PAS resistors (3.92)
Posted by steven oda on 2002-07-28, 10:01:03 (24.205.20.241)
AT, Change the electrolytics, in the bias supply, if the new filter board doesn't have this provision. Put in new diode(s) into the bias circuit, too. Watch all polarities. Check the resistance of tho .......

114: My limited experience....... (3.90)
Posted by Jimmy on 2005-03-21, 15:09:01 (216.93.93.129)
Well, different circuits perform differently with regard to tubes. In my limited experience, the Amperex PQ 7308 made in the USA is a great tube. In the same circuit an Amperex 6DJ8 'A' frame with the .......

115: Re: Ear 834P On Audiogon (3.90)
Posted by g on 2004-08-26, 11:29:11 (24.247.132.215)
Gosh; just talked about that on the phone with a friend. Aren't coincidences fun and exciting? I love to see intersting things like this.. As for your question, who can say? I hear the 834P is fantas .......

116: Tube Advice Requested (3.88)
Posted by Don Reid on 2014-06-18, 17:04:28 (205.188.116.141)
Hey Y'all, I usually inhabit the High Efficiency Speaker Asylum, but I have a question which seems best asked here. I have an old NYAL Moscode 600 Maxi hybrid power amp which I bought new nearly thirt .......

117: Re: Geez guys! - breaking glass (3.87)
Posted by Joe Rosen on 2000-04-08, 01:39:16 (152.163.206.209)
Well, I didn't understand what Rich was trying to prove, or in this case that there was actually a point. NOW he mentions that he wanted to use the 300B( a 5V filament tube) in a 2A3/45 circuit that r .......

118: Re: Need some help reverse engineering a 6BQ5 PP amp (3.86)
Posted by bean_counter on 2000-06-02, 09:40:12 (206.19.116.10)
My experience with console mid-fi amps: snag the power transformer and any good tubes, junk the rest. Look at the draw on the power trannie in the original amp (including fils), measure voltages, and .......

119: Yes but (3.85)
Posted by nightdoggy on 2007-03-12, 05:22:43 (69.87.204.165)
I spoke to Mark O'Brian about the first (KT-77) failure, but not the second (E34L) one. I shot him an email about that one yesterday. He did not have an answer for the KT-77 failure, nor should he. Th .......

120: 5C1 guitar amp clone - screen voltage query (3.81)
Posted by Pete on 2002-06-11, 16:14:43 (203.221.54.110)
I'm building a Fender Champ 5C1 copy (the one that uses a 6SJ7 input tube) and I'm a bit confused about the screen voltage required on the 6V6 output tube. I thought that in SE class A outputs, the sc .......

121: Re: What specs when looking for a "good enough" substitute? (3.81)
Posted by JimL on 2007-05-15, 22:46:35 (75.161.30.103)
A few comments. First, some of your specifications are off. The maximum PEAK heater-cathode voltage is 200v but the average value is 100v. The maximum cathode current is 20 MILLIamps, not 20 amps. Off .......

122: Re: Dynaco FM-3 -- filter cap dying (3.77)
Posted by Maldar on 2000-03-03, 10:51:56 (209.117.158.18)
A service tech with 17 years exp. rebuilding tube radios informed that the transformers on the printed circuit boards (not the power transformer) and descriminators are subject to the same kind of ox .......

123: RE: No but you m,ight use ...Cont. (3.75)
Posted by Old SteveA on 2015-08-15, 11:27:57 (98.221.76.71)
Funny that you should ask about which tube substitutions you can use instead of 12ax7s. I think I brought this up a little while ago here, but I never got around to reporting how I made out in my sear .......

124: Re: Is VTS the only tube place with a return policy?? (3.74)
Posted by Robert H. on 2002-01-24, 10:52:40 (216.191.148.170)
Most places allow you to return defective tubes in 30 days for a refund or exchange. Personally I am glad that other dealers do NOT allow returns of non-defective tubes. That gives me comfort that the .......

125: RE: im new to tube (3.63)
Posted by truep on 2007-06-18, 14:11:37 (71.123.221.207)
It depends on several factors. One is plate voltage. Lets say you are measuring across a 10 ohm resistor (very common). At a plate voltage of 400V at 75 Mv, the tube will dissipate 30 watts at idle (O .......

126: Infamous Marshall Bluesbreaker amp (3.60)
Posted by steven oda on 2003-04-09, 16:04:12 (24.205.139.124)
JS, The one that mde EC "God." I've this model 1962 variant with MOV KT-66 and Mullard EL34 tubes. The KT-66 was has one of the most aggressive overdrive tones, that comes on like a swtich. The EL34 a .......

127: YES - if used properly!!!(Re: Is the 6c33 a reliable tube ?) (3.56)
Posted by mb-de on 2000-11-06, 02:58:55 (131.176.183.182)
I have been using the 6S33S-V (6C33C-B) in OTL/pseudo-OTL circuits for some time. No reliability problems will occur after burn-in if the valves are used properly - they will last for a very long time .......

128: I'm not Joe, but I have my 0.02 British Pound to add..... (3.51)
Posted by Thorsten on 2000-03-06, 05:13:30 (195.99.125.202)
Hi there, First of all, I strongly favour SE Amplifiers, on sonical grounds, strictly. I have yet to hear ANY Push-Pull Amplifier capable of offering the same level of realistic Dynamics, Slam and I .......

129: RE: Am running '52 Sylvanias in WA6 (3.50)
Posted by Amphead on 2014-02-20, 04:30:59 (67.204.163.112)
geoffkait: I had a 52' Tung-Sol 5U4G bottom getter in the WA6 and really liked the balance overall. Now using a 55' Mullard GZ32 which adds a warmer mid-range and has punchier bass, although rolled bi .......

130: Re: which scott or AI? (3.48)
Posted by triodont on 2002-05-24, 22:20:57 (66.81.171.141)
if you can score a copy of vacuum tube valley magazine where they did write-ups on both the 299(x)/lk-72 and 222(x). these are seperate issues. they pretty much nailed it. you could also go to the h.h .......

131: Re: ** Question for Dman - Anthem AMP 1 ** (3.46)
Posted by Barry S on 2002-07-26, 11:21:22 (151.204.59.198)
Hey Kevin! How in the hell have you been? What sort of things have you been working on? You hit the nail on the head regarding the Svetlana's not liking being horizontal. Various posts over the years .......

132: Re: how quick is quick? (3.46)
Posted by Damir on 2003-05-25, 07:30:05 (213.202.69.178)
Although the 6L6GC, 6V6GT, KT66, KT88, 6550, 5881, EL34, etc. have the same socket/base connections (or very similar-EL34), it doesn`t mean that they are substitutes for each other. In guitar amps, ho .......

133: Try This Re: Dyna Stereo 70 biasing problem (3.43)
Posted by Joe Curcio on 2002-11-10, 12:20:24 (66.1.147.188)
First - exchange the tubes from channel to channel to see fi the problem follows the tubes (this is probably not the problem but no harm in getting the tubes as the problem out of the way) Next - pull .......

134: 2A3 (3.41)
Posted by elektron on 2007-06-09, 08:39:46 (69.55.136.146)
Bart, hi. There have been some fairly savage nay sayers propagating their dislike of the 2A3. This tends to quiet those who enjoy the 2A3 from getting on the AA and saying how much they enjoy their pa .......

135: Re: 7591 sound characteristics (3.37)
Posted by elektron on 2004-03-16, 12:05:29 (148.78.243.25)
Type 7591 is the same as 6GM5 and 7868. Only difference is the pin outs and base. I would go with new old stock. You can get adaptors for the 6GM5 from Antique Electronic Supply so you don't have to m .......

136: Ok, that's not a tube box, thats a warehouse! (3.36)
Posted by Gary Kaufman on 2001-06-03, 13:18:50 (65.96.204.89)
Joe - Pwew, and I thought my having 6000+ tubes was a bit off the deep end. I do like 45's and 2A3's, and if you find any Altec speakers you don't want please let me know... Still you raise some grea .......

137: Re: Tremolux (3.33)
Posted by steven oda on 2002-01-15, 18:53:10 (24.205.9.166)
Fred, Where'd you get that gem? People die for the tone that thing produces. Off hand, try lowering the gain in the phase splitter stage---from the 12AX7 to a 5751. Worth a try, if you have a 5751 lay .......

138: Re: Auto Bias ? (3.33)
Posted by dave slagle on 2000-06-13, 15:43:13 (38.26.5.101)
there are two things at play here... fixed vs cathode bias adjustable vs. non-adjustable bias in fixed vs cathode each has a signature, and of the two fixed tends to be the one that is adjustable. if .......

139: I am concerned... (3.29)
Posted by Phil Sieg on 1999-09-27, 07:16:59 (198.144.160.7)
when I read something like this that those of use who use and love low-powered triode amps have been a bit too enthusiastic in our praise of them. Not that they are not wonderful amplifiers when paire .......

140: Re: Tube Matching and Testing (3.29)
Posted by Chris Spafford on 2003-01-15, 13:25:35 (24.247.142.140)
There are many proprietary (read: "secret") testing methodlogies of various companies. A few things, though, are concrete; the number referred to as "Gm" or "Mhos" or "transconductance" is a measureme .......

141: I gave a buddy "old" production Soviet tubes... (3.24)
Posted by DeKay on 2001-10-18, 16:26:30 (64.12.104.48)
(6922 equivalents) from ATSI and a pair Siemens 7dj8's to use in his AI 3A (can't remember which one's went into the phono section). He is thrilled with the sound and on short auditions in both of our .......

142: Re: A question and a comment (3.21)
Posted by Doc B. on 1999-07-30, 07:17:54 (209.20.171.67)
In general I recommend the KR2A3 to customers who have less than 96-97 dB efficient speakers. In most cases they give some oomph to the bass, which is where a typical SE2A3 amp will lose its composure .......

143: Directly heated rectifiers you are hearing (3.17)
Posted by drlowmu on 2011-05-27, 11:25:54 (76.3.53.185)
Hi Andy, As Eli pointed out below, the 5R4 (negatively speaking) has a large voltage drop, meaning it is higher in Z than the 5U4 family and the 5V3, 5V3A rectifiers. What people hear when they like t .......

144: Lateral thinking - ECC40 or E80CC (3.12)
Posted by andy evans on 2008-05-06, 13:47:46 (172.188.222.147)
I wouldn't hesitate to rip out any ECC88 or 6922 that could be replaced by a E80CC if the circuit allowed it (excludes cascodes etc). I'd go further and substitute rimlock sockets and use the ECC40. .......

145: RE: preamp vs power amp tube distortion (3.11)
Posted by TubeAcolyte on 2014-08-11, 19:57:52 (99.241.117.55)
Topology/purpose of the circuit is crucial. Mainly, are we looking at more classic setups like 50s, 60s and 70s Marshalls and Fenders, or higher gain (typically master volume) amps. I find power tube .......

146: Re: Best ST70 mods??? (3.11)
Posted by Uncle Ned on 2000-02-16, 14:02:42 (199.179.160.81)
>Dear Ned, 6B4/2A3 is good for maybe 300Volts Anode to Cathode. An ST70 >will give you 450plus. 6B4/2A3 has a mu of 3 1/2. Triode connected EL34 >has a mu of 8. Bias requirements for the 6B4 are much .......

147: Re: Which PP pentode amps sound like solid state ? (3.01)
Posted by john dem on 2002-07-26, 22:21:03 (211.28.96.39)
Hi Kurt- I find it difficult to believe that you would endorse a gratuitous comment about pentodes sounding like solid state- if the majority of el34/84/KTXX/6550 etc amps commercially made prior to a .......

148: Re: What's in Your tube box? (3.01)
Posted by tomcat on 2001-06-04, 16:03:53 (202.139.132.145)
Yeah, thanks, what caught my attention and prompted me to enquire was your use of "valves" and reference to the 807 and 6as7. It's true everybody has gone over the top with 2a3's, 45's, 300b's, etc., .......

149: "Wondering now if there is a thermal protect device" (3.01)
Posted by 1973shovel on 2018-12-19, 14:41:08 (96.37.198.203)
Even if Dynaco felt a thermistor (or similar device) was necessary, I couldn't imagine them winding it inside a transformer. Just so we're doing an Apples to Apples comparison, tell me if the follo .......

150: Re: Experiments with "UltrPath" connection (2.94)
Posted by Kurt Strain on 2001-03-06, 11:07:01 (156.153.255.114)
There is more going on than being just another filter cap. It samples what's happening on the B+ and amplifies it through the output stage. If the power supply drops, the "UltraPath" capacitor forces .......

151: Re: Hickok testers and older triodes (2.92)
Posted by PhilF on 2002-09-06, 02:04:18 (64.24.135.101)
One of the biggest problems with testing directly heated triodes like the 45 and 2A3 is that most testers give you an emission test only, not a Gm (mutual conductance) test. This is because the 60 cyc .......

152: Well.... (2.91)
Posted by Chris Garrett on 2004-05-18, 17:08:22 (205.188.116.9)
my buddy has had Duo v.1s for over three years and I probably have between 100 and 200 hours sitting in front of them with many different components. For tube amps, I've heard them with Andy Bartha cu .......

153: To ANON and the whole gang on 6L6gc Black plates (2.89)
Posted by MIchael Samra on 2005-06-15, 15:30:40 (66.188.56.2)
Guys.One of my dynaco st70 amps I modded with tubes4hifi board with the 3 12at7s is fantastic becuase it has separate bias for each tube and 350uf of filtering i added underneath along with the filt .......

154: Re: Thinking of trying tubes- Suggestions please (2.78)
Posted by jpchleapas on 2005-06-08, 20:59:20 (151.203.82.176)
http://cls.audiogon.com/cgi-bin/cls.pl?ampstube&1123464736 A pair of amps like this would be better. They would not break the bank. Your 100dB efficient drivers can sing with a lowly 1.8 wpc pair of 4 .......

155: Re: BiasCaps (2.77)
Posted by Uncle Ned on 2001-11-12, 21:49:06 (199.179.160.248)
The amount of uF required for a given amount of ripple reduction is proportioate to the current being drawn, and as you correctly surmise, there's not much being current being drawn except for the vol .......

156: RE: Russian Tube List? (2.74)
Posted by twystd on 2010-01-01, 12:04:41 (24.174.46.195)
I can help some. First thing, there is a lot of confusion because of the difference between the western alphabet and the Cyrillic alphabet. I'm going to use the Western spelling because that's the way .......

157: Are you building a Fi-Primer version? (2.71)
Posted by darkmoebius on 2003-08-03, 14:00:55 (68.4.35.254)
There's a PP 807 design in one of 1994 releases of the French magazine Audion that operates in both triode and pentode. It might be worth tracking down: 1994 n. 1/2/3, 45.000 liras + shipping - Singl .......

158: Hi Steve: I never tried the 6900 (both due to price... (2.64)
Posted by DeKay on 2002-03-11, 00:39:46 (152.163.206.206)
and also, per feedback, that it seems to very fickle on the circuit that it is used in). I did not want to try a $100+ experiment on the tube that has the least impact on the amp's sound. My general f .......

159: Re: Could you be pushed to say (2.59)
Posted by John Chleapas on 2005-03-24, 21:16:35 (68.160.162.146)
I started out with a modified Dynaco ST-70 that my friend Kevin Kennedy rewired for me, and he helped install his circuit in. I still own that amp and a second Dyna ST-70. The EL34 "sound" wired in tr .......

160: RE: How must I test an ECC83? Professional answer needed! (2.56)
Posted by EML on 2009-06-06, 05:44:44 (78.43.110.157)
Here is a rare picture of a Tesla Automated tester * * * * Thanks for the good feedback so far. Just like to point out that the Amplitrex is a parametrical tester, no data is measured in an unkno .......

161: Why do we use the some old "boring" types of tubes? (2.52)
Posted by Rob Mercure on 2006-08-23, 04:27:10 (151.199.89.138)
Ray, Why are folks stuck on 12A_7s and 6SN7s, 2A3 and EL34s (etc, etc,) when there are scads of NOS "horrible" and vertical output tubes and signal level tubes available for pennies? The same answer - .......

162: Re: Tube tester rating ambiguity (2.51)
Posted by Chris Haedt on 2003-07-07, 03:58:54 (216.40.163.138)
The typical mutual conductance tube tester sets a reject point for a tube at 35-40% below what an "average" new tube would test. Some testers may use tougher standards for voltage amplifiers (like a 1 .......

163: Amps shootout (long) (2.49)
Posted by EdT on 2001-08-14, 09:04:27 (192.9.25.22)
Note: I happened to have many amps over the last couple weeks. So I thought something like this would be interesting. This shootout was meant to be fun and to share. Result is non-scientific, .......

164: Best Tube & Application- Home Entertainment applications (2.48)
Posted by Neff on 2008-09-13, 06:46:30 (205.188.116.141)
PREAMP Tung Sol 6P5GT or 76 type. Input preamp tube with great bias point at 100 volts plate that outperforms 6J5 or 6SN7 (two 6J5s). RCA 26 tube has a performance edge, but direct filament makes for .......

165: Impressions of SuperTNT 845M, 845B and Valve Art 845 at 400V (2.48)
Posted by Rick R on 2005-03-31, 13:33:33 (4.41.255.114)
I finally have had the time to compare the 845M against the 854B and other Chinese 845’s using my John Hogan custom 6SN7/45/845 integrated amp. The amp runs the tubes at 400V, much lower than most oth .......

166: Re: EH 6550 Grow like a light ball. (2.43)
Posted by chris spafford on 2003-04-01, 17:30:10 (66.227.182.163)
Paul-- OK; let me make sure I have the facts straight before I postulate any theories. You bought 4 new Valve Art 6550s, and they biased fine. When no music is playing, everything is normal and none o .......

167: Re: Please don't tell us what you really think! (2.38)
Posted by Joe Rosen on 2001-06-21, 16:04:01 (152.163.213.194)
Not that Kurt doesn't have strong opinions of his own! Some people not only don't like dissenting opinions, but they go as far as considering the citing of scientific FACTS that conflict with their op .......

168: Try to find the rare 5V3A.....................the A really means something (2.37)
Posted by Cleantimestream on 2009-09-28, 15:55:57 (24.29.24.226)
Five Volt Fullwave Rectifier Tubes Tube# - Base - Fvolt - Famp - Vdrop - MaxPmA - MaxPv - notes 5AR4/GZ34-5DA - 5.0 - 1.9 - 17 - 250 - 450 - low Vdrop 5U4/5Y3 5AS4-A - 5T - 5.0 - 3.0 - 50 - 275 .......

169: Re: RE: Why do my NOS power tubes take so much to bias compared w/ new production? (2.34)
Posted by shermanr@prw.net on 2007-04-30, 14:12:46 (198.24.6.134)
Good NOS Power Tubes can easily out-perform modern Power Tube types in almost all areas, even sonics, in most Vintage amps. Even used NOS Power Tubes can function and sound better than current product .......

170: Re: The high price of NOS Tubes (2.28)
Posted by Jim Doyle on 2003-01-27, 18:11:19 (24.60.186.181)
I see no other cause other than the plague of "collectability". Collecting is at best a passive pursuit and you dont have to wait for a regional show or swap meet to participate ; you can collect eve .......

171: Re: Have you ever heard an MV55? (2.24)
Posted by Joe Rosen on 2001-05-09, 03:06:33 (152.163.204.198)
To be honest, my opinion of c-j amps is if you've heard one lousy one, you've heard the complete line in detail, and that experience will serve you in perpetuity! I probably have heard the MV-55, and .......

172: Re: Power ratings... (2.23)
Posted by Roger A. Modjeski on 2001-08-10, 11:43:07 (207.71.218.212)
Thanks to all of you who read my manual, for quoting it and defending the amp to those who out of hand disclaim groundbreaking research into new circuits. There is far more to me done. Just because th .......

173: RE: NOS tubes in white boxes (2.19)
Posted by Jim McShane on 2008-07-20, 20:50:55 (71.194.241.37)
"I hope that you understand that it is very rare for tubes to be NOS in white boxes." I believe you are mistaken. There are a number of very valid reasons a tube would not be in the original box, th .......

174: What specs when looking for a "good enough" substitute? (1.99)
Posted by Mark Tinordi on 2007-05-14, 15:35:37 (71.246.233.59)
This is for future reference. As a newbie I shouldn't be screwing with this sort of thing, but I'm curious. My headphone amplifier is made to use 12AU7s (among other things), but I've been in contact .......

175: Sun Audio SV300B MKII Amplifier (Tube) (1.85)
Posted by Lynn Olson on 2002-05-20, 15:43:41 (216.175.99.236)
I'd like to second the comments posted above. My hifi buddy Gary Dahl and I heard this system about a month ago (with a different but very good preamp) and Gary and I were mighty impressed. We played .......

176: REVIEW: Supratek Triode Chardonnay Preamplifier (Tube) (1.84)
Posted by M. Vidal on 2008-05-24, 16:07:12 (70.45.141.25)
Model: Chardonnay Category: Preamplifier (Tube) Suggested Retail Price: $2,200 Description: 6SN7 Tube Transformer Coupled Preamplifier Manufacturer URL: Supratek Triode Review by M.Vida .......

177: RE: A Question about tube gain (1.81)
Posted by TubeAcolyte on 2019-07-29, 11:12:46 (142.206.2.21)
Bill's answer is spot-on. There are a few things you can do to help your situation a bit. Unless we've misunderstood completely, this matter isn't about gain. Gain is a weird concept to express in sho .......

178: Re: Ok, that's not a tube box, thats a warehouse! (1.77)
Posted by Joe Rosen on 2001-06-04, 11:05:34 (152.163.195.214)
Love that picture! Most of my valves are "bulk packed" and subsequently relocated to immense cardboard boxes, and spread out over several storage areas (three, at last count). So this doesn't give as .......

179: Amplitrex Tube tester Error. (1.75)
Posted by EML on 2012-04-28, 12:16:59 (78.43.109.101)
There is no sub-forum for "tube testers", so I just post it at "Tubes" here. Hopefully, giving some more attention to this software error, will help to get things moving, which is beneficial to all of .......

180: REVIEW: Transcendent Sound Tube Analyzer Accessory (1.56)
Posted by Tom �. on 2002-11-26, 08:30:21 (205.175.225.22)
Model: Tube Analyzer Category: Accessory Suggested Retail Price: $579-1099 Description: Vacuum tube tester/analyzer Manufacturer URL: Transcendent Sound Model Picture: View Review .......

181: Re: Newbie needs explanation (1.43)
Posted by Joe Rosen on 2000-03-04, 02:57:12 (205.188.193.187)
Dear Scott: This the menagerie, if you will. SE: This means "single-ended". This refers to the output stage only, but nobody has yet done a push-pull balanced input & driver stage for an SE output tha .......

Found 200 records in Tube DIY Asylum.

1: 6AK5-45 (8.69)
Posted by MartinRamon on 2009-04-10, 16:15:30 (200.119.35.43)
Hi Diyers, My next project is to change my 6F8G RC 45 Set based on the circuit 6SN7 cascade similar to the Sun Audio. The idea is 6AK5-45. 6AK5 very close 717A (Yamamoto use in the 45, pentode 7 .......

2: RE: 6SF5 to 45 design help (8.69)
Posted by Qman on 2014-08-29, 11:43:00 (75.149.210.22)
Hey- I built this circuit last winter and spent quite a bit of time tweeking it for the 45 tube but with a 3k primary. I currently use the 2A3 circuit you posted. I haven't decided what 5k primary to .......

3: 45 pre circuit (8.21)
Posted by rick57@optusnet.com.au on 2006-06-01, 01:21:03 (211.28.196.246)
Hi Jeffrey Do you know a good 45 preamp circuit? Cheers .......

4: Any Good Circuits for a 56->IT->45 Amp? (8.20)
Posted by GKwei on 2003-02-23, 08:23:15 (66.87.84.134)
In the 1930's the 56 was the driver of choice for the 45. However, the gain is low and presents problems in designing a good circuit for a type 45 tube. Does anyone have any suggestions or experience .......

5: Morrison Micro circuit for 45 tube (8.14)
Posted by wclarson12 on 2015-02-18, 08:29:25 (100.40.163.12)
Hello all, this may have been covered at some point but I haven't found it. I am assembling parts to build a Micro but wish to use the 45 tube. I have read that the amp as designed is tough on the 2a3 .......

6: RE: Just lost a type 45.... (7.97)
Posted by drlowmu on 2008-12-19, 21:03:19 (76.0.20.186)
Hi drummerwill, So sorry about the 45!! What is the filament voltage applied to your 45 tube, measured right at the SOCKET pins?? What is the operating point of the 45 in your circuit? Voltage on pla .......

7: RE: DIY 45 amp (7.75)
Posted by MartinRamon on 2007-08-21, 22:11:21 (201.245.242.143)
Hi, I make my 45 amp over the cascade with (2)6SN7 and 45, the circuit is similar Sun Audio, I request excuses by my English, is not my language mother, thanks, Martin .......

8: DC coupled 45 parafeed SE circuit (7.72)
Posted by C.Y on 2004-03-01, 19:29:13 (218.145.25.46)
Hello all, Starting from Kurt Strain's 45, I got to build a small amp that I liked for my high eff. horn system. Circuit was drawn by Express PCB program, and the DC heating is just optional. Enjoy! C .......

9: Re: feedback? what feedback? ... circuit.. (7.62)
Posted by drummerwillwr on 2004-11-28, 19:12:21 (65.69.45.179)
I don't have a scaned copy of the schemo. But its a Wurlitzer jukebox amp model 661. Its a type 30 : tone control : 30 RC 45 IT 45 PP. Its an early model no feedback in the circuit. The power supply .......

10: Seeking schematic for Eric Barbour's single ended glory 45 (7.60)
Posted by Tubefever on 2004-01-15, 21:00:00 (69.3.25.175)
I am breadboarding SE 45 amps and am curious about this circuit, as many people refer to it. Can any body send me a schematic or even a description of the circuit? Thanks .......

11: Re: 2A3 convert to 45 Help! (7.56)
Posted by Michael Samra on 2007-03-13, 23:44:05 (24.236.143.54)
Les I remember these beauties from a year and a half ago and the compliments we gave you on them..What a work of art..If I were you I would go and put a 45 in to try but Yyou may have to lower the B+ .......

12: RE: 45 SET distortion spectrum graph. (7.54)
Posted by deathtube 667 on 2012-12-21, 21:12:04 (24.140.98.34)
Here is the spectum graph of a SE 6V6 circuit in triode mode. This circuit will put out about 800mW at full power. Not the same tube as a 45, but your results are similar to what I get. ::: TO .......

13: Re: Need Advice: Trying 45 triodes in a 2A3 Circuit (7.51)
Posted by arnoldc on 2005-03-30, 16:14:57 (202.175.214.170)
Hi, I have an amp that can take 2A3/45 too (and using 5842 drivers as well). You need 15W 1K5 wirewound (or equivalent) power resistors, two pairs if you want a switchable amp. The idea here is that w .......

14: 45 preamp (7.45)
Posted by rick57@optusnet.com.au on 2006-05-30, 14:58:34 (211.28.196.246)
Hi Guys What 45 preamp circuit do you suggest (preferably with priority to: dynamics, detail, then if not too conflicting, lack of harshness). (The 45 doesn’t have any qualities that don’t suit it t .......

15: Re: Please tell me your best SE driving circuit !!! Ask for your design idea. (7.43)
Posted by Jim A. on 2003-07-12, 13:03:47 (198.81.26.9)
Yeah, that's my question too. I'm loving a 6V6 operated pentode R/C coupled to a 45 even as we speak . . . 180Vp, 100Vs decoupled w/50uF, self-biased at -6V . . . non-tweaked circuit, sounds great, re .......

16: RE: difference between a 45 tube and a 46 tube (7.37)
Posted by Stephen R on 2023-10-11, 10:22:56 (161.29.127.18)
45 has 1 grid, 46 2 grids. Filament current is different. Biasing is bound to be different. Without careful consideration of the circuit parameters, they are not directly interchangeable. Without a ci .......

17: Need Advice: Trying 45 triodes in a 2A3 Circuit (7.37)
Posted by David Lawrence on 2005-03-30, 15:46:15 (130.179.12.107)
I have an SE 2A3 amp based on Gary Dahl's 1997 design--using 417/5842's to Magnequest RIT5 (airgapped version) IT transformers to 2A3's at about 300 volts on the plates and 750 ohm cathode resistors. .......

18: RE: Agreed, but a circuit optimized to drive a 2A3 will sound Lifeless driving a 45~nT (7.28)
Posted by vinnie2 on 2019-05-07, 10:40:16 (75.89.237.62)
If you built the circuit I posted then you know it does not sound "lifeless" with either a 45 or a 2A3. Poor choice of words methinks. .......

19: RE: DIY 45 amp (7.26)
Posted by MartinRamon on 2007-08-22, 11:30:19 (201.245.242.143)
Thanks, I know 300B, 2A3 and the VT-25 all uses this circuit with very small variations, the value of the cathodhe resistor in the power valves, 750 ohms 2A3, 1K 300B and the 1,5K for the VT-25. The 4 .......

20: Re: Seeking help about my 2A3 to 45 conversion (7.26)
Posted by Dale D on 2003-06-10, 08:20:48 (66.219.156.189)
Hi, Your biggest concern going from 2A3 to 45 is changing the cathode bias resistor. I can't remember what JE has in his circuit. If the cathode bias resistor is around 1.5K, you'll be fine with eithe .......

21: RE: Morrison Micro circuit for 45 tube (7.18)
Posted by drlowmu on 2015-02-18, 10:22:49 (71.0.211.143)
Yes. You will want about a 5 K output transformer. My favorite op point for a 45 would be quite conservative, likely 250 VDC P-K and about 27 mA. or 6.75 Watts. I'd modify JC's circuit and only use o .......

22: RE: Agreed, but a circuit optimized to drive a 2A3 will sound Lifeless driving a 45~nT (7.11)
Posted by vinnie2 on 2019-05-07, 08:56:41 (75.89.237.62)
Sorry, but I can not agree with that. The srpp 45 I breadboarded in this thread can use either a 45 or a 2a3 as an output tube, and though it will not be optimized for one of them, both sound very goo .......

23: Re: Here's the schematic - did i get it right? (7.07)
Posted by Kuei Yang Wang on 2003-08-20, 01:21:15 (82.35.157.27)
Konnichiwa, Actually, there are a few things not quiet right. 1) You must return the 45 Cathode resistor to the 417A Cathode, NOT ground, or you MUST raise the Cathode resistor for the 417A to around .......

24: Instability? Nah. (7.00)
Posted by Brian C. on 2003-08-24, 11:14:36 (81.111.8.50)
Just got back from holiday break so would have posted earlier. Dave, I prototyped Thorsten's original "Full Monkey" 2A3 amp (6S45P driver) and it was an exceedingly well mannered circuit. Absolutely n .......

25: RE: 6AK5-45 (6.85)
Posted by MartinRamon on 2009-04-11, 20:39:13 (200.119.35.43)
OK Douglas, I have 6SJ7 and 6J7, I build 6C6>300B over the RCA 6C6-2A3, The circuit modified for 45 here,thanks .......

26: Can the 27 or 56 be uesed in SRPP circuit to drive 45's? (6.84)
Posted by Docgab on 2003-04-10, 13:16:21 (68.107.248.50)
This may be a dumb question, or already covered (although I can't find it). Can 2 27s or 56s per channel be wired as an SRPP circuit? If so would there be enough gain to drive a 45 output tube? I have .......

27: Re: Bugle 45, any views on improvements? (6.82)
Posted by glc on 2005-08-10, 10:37:28 (82.48.28.152)
Thorsten can you send a more complete 417/45 (VT52) Rankin circuit? The gif file that you sent is not very readable. Thanks. Gian Luca Cazzola .......

28: RE: 26/27/45 or 26/2c22/45 possible in JE Labs SE45dx..? (6.80)
Posted by JANDG on 2007-10-25, 20:13:00 (65.54.155.43)
I would be about 45 min S. of ya..give me a shout off forum & will trade some tube geek info. The 2c22,..once I found out what it was, since I was saving them few I have because they were neat looking .......

29: Re: Kits for 45 (6.71)
Posted by bean_counter on 2002-06-14, 18:28:12 (216.214.210.158)
The JE Labs Simple 45 amp is a really good 1st scratch built project. Simple circuit, low parts count. Gordon Rankin's Bugle 45, orig. published in Sound Practices, is much better, tho a bit harder b .......

30: Re: 45 into an 845 parafeed circuit (6.69)
Posted by danlaudionut on 2006-09-03, 15:58:13 (205.188.116.66)
Try Jim Doyle's site Has a few 845 schematics V5 has interstage transformer coupling From Lynn Olsen on the 6W6 as a driver : "I received a tip from John Atwood ... the 6W6 is a "sleeper" tube that ma .......

31: SE 45 active parafeed breadboard ... (6.68)
Posted by deathtube 667 on 2015-05-06, 17:16:54 (24.140.98.34)
Got the SE 45 active parafeed circuit wired up on my breadboard tonight. No problems with center tapped AC heaters despite the bird's nest breadboard presentation. Subjectively, very enjoyable lis .......

32: really basic questions, about shunt regulating a 45 output stage (6.65)
Posted by keto on 2006-06-17, 16:44:48 (201.135.109.13)
Hey all, I'm wondering about shunt-regulating a "parafeed" 45 output stage, and getting away with shunting the same current as the stage itself, say 34mA each for a stack of VR tubes and the "parafeed .......

33: Yes they all are DIY (6.63)
Posted by arnoldc on 2004-09-13, 16:55:31 (202.164.170.101)
The 2A3 is a JE Labs SRPP, the 300B is *currently* a JE Labs deluxe circuit, the 45 is *currently* a Thorsten inspired cap coupled amp (the 45 designed by Thorsten is being re-built), the 807 is a Gor .......

34: DIY 45/2A3 Circuit Suggestions (6.59)
Posted by LeBob on 2009-01-15, 10:17:19 (74.167.142.166)
I've had a 300b amp chassis finnished for a couple of years now. It was going to replace the 300b amp I bought but I want to keep it. I would like to use the parts to build a 45 or 2A3 amp instead. .......

35: RE: Update (6.58)
Posted by deathtube 667 on 2016-05-25, 17:10:05 (24.140.98.34)
IMO/IME, You would be better off going for a DC 45 final circuit and using something like a Triad C56-U as an input choke to get the B+ a bit higher. For the cap coupled final, you will need to drop m .......

36: RE: Anyone know where I can find/get schematics for PP 45 or 46 amp? (6.53)
Posted by bfranchuk@jetnet.ab.ca on 2009-07-29, 18:47:37 (205.206.150.101)
PS. I think Blumlein's garter circuit, would be a nice addition to a 45 PP amp. .......

37: RE: Morrison Micro circuit for 45 tube (6.52)
Posted by hifipaul on 2015-02-20, 08:21:43 (24.168.39.138)
Jeff I was referring to the 45 with the low bias comment. For the 7b4 I would like to look at a schematic of a successful amp, in order to implement it, or spend weeks experimenting. Perhaps you coul .......

38: Re: Has anyone built an SET amplifier with a 45 driving a 300B (6.50)
Posted by arnoldc on 2006-03-16, 17:17:55 (202.175.214.170)
Hi, please visit www.tubelab.com and see how a 45 tube is used as a driver for 300B and 845. Cheers! ps. I am not affiliated with him, but he has interesting circuit! You can talk to the guy over at D .......

39: RE: more spectrum graphs (6.48)
Posted by deathtube 667 on 2012-12-22, 18:41:02 (24.140.98.34)
Your results are probably correct, but I am not that familiar with the 45. I got a couple of those 45 tubes but never tried them in a circuit. Here is a SE 6V6 in UL mode for comparison. 1W RMS out .......

40: RE: Back to the 26/26/45 amp...... (6.48)
Posted by drlowmu on 2016-01-19, 15:18:43 (71.50.17.159)
Vinnie, I am SO happy you are going Type 45 instead of the 300B !! The Type 45 is such a nice tube, and its easy to drive. I use an inexpensive output trannie on my 45 amp, and I find OTHER things in .......

41: DIY 45 amp (6.46)
Posted by etch on 2007-08-21, 12:07:01 (24.131.41.131)
As it has been documented here in the past couple of days I have been having serious problems with my 45 amp, primarily because of the 5842 tube in the circuit. I've followed the helpful advice that P .......

42: Re: Need Advice: Trying 45 triodes in a 2A3 Circuit (6.45)
Posted by arnoldc on 2005-03-30, 19:35:18 (202.175.214.170)
Sorry, I have no experience with that. I am using a 5K Tamura F-475 on my amp. So the 2A3 is actually seeing a 5K load, like the 45. I believe the ideal is 3x the Rp of the power tube, but it might be .......

43: 45 tube B+ question...HELP! (6.45)
Posted by mike33123 on 2006-03-20, 16:09:23 (12.211.88.157)
I am experimenting with a 45 SET amplifier circuit as follows: 6SN7 driver with interstage transformer secondary to the grid of the 45, 1.35K bias resistor and 25MFD oil capacitor in parallel to it fr .......

44: RE: 45 amp cathode resistor explanation please. (6.44)
Posted by mg16 on 2019-12-21, 07:28:14 (24.101.153.10)
Yes, Mills non inductive 12 waters for the 45's. What do you think of AM-TRAN AMRG resistors, also from HiFi Collective, in all other positions within the circuit? I have Audyn Plus polypropylene caps .......

45: RE: Direct Coupled 2A3 Alternatives: Morrison SRPP or Micro (6.43)
Posted by David Lawrence on 2015-06-18, 10:13:02 (24.111.65.90)
Thanks a lot to all of you for your responses here and off the list. I have some other amps I like a lot--Loesch/Legacy 300b, Dahl style IT SE 45, McShaned Citation II, etc., and this is a side projec .......

46: All Very Interesting (6.39)
Posted by Fullrun on 2004-09-16, 17:15:17 (68.36.46.10)
From what I am gathering a really good SE circuit is more about "refinement" than "more". I had actually heard a 45 earlier this year based on the old Hammond Iron.. I think it was a 27/6SN7/45.. if I .......

47: 45 heater warm-up (6.38)
Posted by Kurt on 2003-01-25, 17:20:00 (209.148.101.34)
I just noticed something about this. The VV45's I have (solid plates) heat up much faster than an old globe 45. The VV45's will heat up faster than the 5U4 rectifier I use in my PP45 amp (a 5U4 rectif .......

48: RE: One vote for JEL Simple 2A4/45! (6.37)
Posted by bean on 2008-09-05, 16:34:48 (76.16.255.214)
I built the "Simple", then changed it to use JEL's SRPP driver circuit. Used the iron out of an old Admiral SE EL84 console stereo. Looked like heck, but I only had $125 in it. It's a very good, very .......

49: RE: 45 SET distortion spectrum graph. (6.37)
Posted by deathtube 667 on 2012-12-22, 10:00:47 (24.140.98.34)
No problem. The triode 6V6 is said to sound similar to the 45 based on some reports I have read. I plan on running some tests on my circuit since I am now running finals in UL mode. I want to see if a .......

50: Single 45 Amp question and pics (6.35)
Posted by Les Hudson on 2007-03-01, 01:13:50 (72.128.205.180)
I built this Single 45 amp and it sounds great. I was measuring the plate voltage and it seems unusually low. I'm measuring 128v on the 6SN7 plate and 280V on the 45 plate. Is this right? Is there a .......

51: Re: HOT! HOT! Bias resistor on 45 in my Bugle!! (6.34)
Posted by groverg on 2003-05-23, 07:48:20 (138.88.43.252)
Check you grid circuit on the 45. Sounds like the tube is running away. Something's not hooked up properly. Running a small SE amp unloaded for a few minutes shouldn't cause any problem. .......

52: Read closer (6.33)
Posted by Alan Breece on 2002-05-10, 07:15:54 (167.176.6.8)
I meant "shoddy designs" which mean't crappy ones in general.I have tried the El84 driver 300B/2A3/45/10Y circuit and it sound pretty nice but it's not the end of all circuits.I just think it's a bett .......

53: Few more questions about the Bugle 45 (6.30)
Posted by Docgab on 2003-04-11, 15:28:32 (68.107.248.50)
Will it effect the circuit negatively to use a 12uF cap instead of a 10 uF on the B+ into the top cathode of the 6072a. Also, what about using a 24 uF cap instead of 22 uF for the bipass cap for the 4 .......

54: RE: Morrison Micro circuit for 45 tube (6.29)
Posted by Paul Joppa on 2015-02-18, 11:59:06 (24.22.235.48)
I agree with this operating point, for a 3K output transformer primary. The best adjustment would be to put a trim pot in place of the driver cathode resistor, and adjust for the right plate to cathod .......

55: Very Interesting....... (6.23)
Posted by vinnie2 on 2019-05-05, 07:07:06 (216.96.52.174)
Like the guy on the tricycle used to say on "laugh-in" many years ago. Anyway, I was looking at the schem for the 2A3 srpp and thinking a 2a3 should play in the 45 srpp they are so similar. So I pulle .......

56: RE: I like the Tri/pent for those trafos as there are no surprises. (6.20)
Posted by Eli Duttman on 2016-05-01, 10:44:25 (69.141.96.215)
"Would it for instance also be suitable to use this circuit for 45-PP?" That small signal circuitry can produce something in excess of 50 V. peak to peak, as it takes that much to drive "12" W. tubes .......

57: RE: SE 45's in stereo : tube ghetto... (6.18)
Posted by rage on 2013-11-22, 06:46:31 (68.61.26.99)
the dead silent noise floor is very important to a few friends of mine.. i like my amps to hum a little to drive them crazy when they listen to my system. it is a nice sounding circuit. I bet the 45 i .......

58: Got a slew of ST shaped VT-63/46's (6.17)
Posted by Ivan303 on 2005-06-05, 13:02:10 (172.194.168.96)
At least a dozen of them. What are they good for? Do they sound/measure anything like a 45 when the second grid is attached to the plate? Could you substitue a 46 for a 45 in a circuit, if you tied th .......

59: Re: Can somebody share a simple, but good sounding (to your ears is ok) PSE or PP 2A3 circuit (6.16)
Posted by Kuei Yang Wang on 2004-01-16, 14:47:10 (82.35.157.35)
Konnichiwa, Howzdat? Runs 45, 2A3 and 300B as you like, sounds good and I got around 6W RMS with 45's in there, more with 2A3 & 300B. Sayonara .......

60: 10Y WOW! (6.11)
Posted by 45drive45 on 2002-03-31, 06:09:51 (202.156.2.139)
I cannot say that I have a lot of experience with tube amps but so far I have built 2a3, 45, 300B. vt52 and for drivers have used 6sn7 and 5842. After modifying my 'universal' amp which could take 2a3 .......

61: RE: 45 operating point ... (6.11)
Posted by vinnie2 on 2015-09-03, 10:49:16 (71.30.110.82)
I wasn't really trying to copy Willie's amp exactly, I was just trying to see if the single tube 26 preamp circuit I put toghether could be adapted to something like Wille's amp. Turns out it can. In .......

62: Re: 45/2A3 PP amp or is it 2A3/45 PP amp (6.09)
Posted by keto on 2004-11-11, 18:24:02 (148.240.220.73)
Now, why did you have to do that? Here I am, figuring and refiguring my PP2A3 (it was a PP300B earlier this week), and I've got the final fixings for a 45 SE amp on the way... Is this a PP45-PP2A3 cir .......

63: RE: 45 operating point ... (6.09)
Posted by deathtube 667 on 2015-09-03, 09:51:34 (74.219.107.178)
DRW is running his 26/26/45's at low bias current and high Vp-k. Changing to a more conventional operating point or going cap couple to the finals is going to alter the harmonic profile of the circuit .......

64: RE: What to do with a 5K SE OPT into 5 ohms? (6.09)
Posted by sideliner on 2015-09-03, 11:41:51 (206.71.241.42)
How about a 4P1L driving a 45 through a step-up interstage. Perhaps a 1:2 or 1:2.5 step-up would suffice. A typical 45 circuit would need about 55V max swing one way. A 2V RMS input will translate to .......

65: In search of Parafeed DC coupled 45 schematic (6.07)
Posted by Tannoyguy on 2012-12-15, 11:01:53 (207.34.210.253)
Hi guys. I have on my shelves a set of Magnequest parallel feed transfos and chokes meant for a 45 amp. I think it's the time now to do something with them. I am no tube engineer, but I've built the F .......

66: Re: 45 single ended amplifier advice wanted (6.06)
Posted by mg16 on 2006-04-13, 10:09:40 (24.154.27.75)
Hi, I built Eric Barbours "Single Ended Glory" 45 Amp, and like it very much. It was first plublished in Glass Audio Magazine March 95 issue. Simple circuit, and sounds excellent IMO. Best of Luck, mg .......

67: RE: Best replacements for Elna Cerafines in Bugle 45 PSU circuit (6.05)
Posted by xaudiomanx on 2009-03-13, 07:53:23 (68.194.254.219)
What is wrong with what you already have? Maybe just do some bypass caps(film types)? How is the sound of that amp. The circuit seems to be as simple as it gets. .......

68: 45 v 10 (6.04)
Posted by rick57@optusnet.com.au on 2006-05-31, 16:02:59 (211.28.196.246)
Thanks! those sonic summaries are very useful. Was it the same circuit on each? The 10 sounds more what I’m after. Could you describe the circuit a lttle more? Cheers .......

69: RE: 45 schematic (6.02)
Posted by 2bkurius on 2010-05-12, 15:45:55 (207.237.88.96)
The ability to draw a circuit like that seems pretty mysterious to me. Thanks so much. A few questions: Don't I still need a power supply? Is the point where the 460volts comes in the b+? The purple .......

70: Re: Transformer for 45 and 26 (6.01)
Posted by Perseo on 2007-01-30, 05:31:10 (75.67.80.214)
Mikey answered regarding output transformers (~5k impedance SET for 45 SET vs. ~15k to 20k impedance for a 26). I am wondering if the question concerns filament supply or plate supply? Filaments for .......

71: Re: Cathode Bias Resistor Value for 45/2A3 Amp (5.97)
Posted by PrairiePete on 2005-01-27, 19:21:40 (142.165.224.139)
They are direct coupled circuits. Notice there is no grid leak circuit on the 45's and no coupling capacitor. To maintain the bias the resistor has the added burden of the driver voltage. Do a search .......

72: RE: puzzled once again... (5.96)
Posted by elblanco on 2018-06-11, 11:18:57 (100.16.152.111)
the circuit as drawn is for a 45. 325 - 55 cathode is 270 plate. 1500 ohm resistor with 55v through it is 36 ma. classic 45 operating point. do not use vintage 2a3 unless you can get B+ down to 295v a .......

73: Re: 45 single ended amplifier advice wanted (5.95)
Posted by Vatron on 2006-04-13, 12:54:35 (4.244.171.78)
Improved Simple 45? Here is an interesting circuit that may be what you are looking for. Good luck Norris Wilson .......

74: Re: well Piano man... (5.95)
Posted by groverg on 2004-09-30, 09:45:15 (68.239.66.111)
Input power was kept at full grid voltage, i.e. 45 volts. Third harmonic distortion went up significantly, like .8%, in the SE circuit with the lower load, more like a .3% change in the PP circuit. :: .......

75: It is possible. (5.90)
Posted by sser2 on 2007-10-04, 19:33:23 (128.125.179.129)
71A and 45 have same amplification factor and Miller capacitance, so 45 should work in this circuit too. However, if full benefit of increased power is to be obtained, B+ and idle current should be in .......

76: 45 into an 845 parafeed circuit (5.90)
Posted by rick57 on 2006-09-03, 05:08:33 (58.107.189.194)
Hi guys I’ve read just about all the posts on 845s at AA (and some others). I’m interested in doing an 845 SE power amp, and just now have some funds and time. After designs not too complex, or too ex .......

77: Re: Tamura F-5004... (5.90)
Posted by glenz on 2006-01-11, 20:06:48 (205.188.116.7)
The Tamura F-475(5K/45mA) is a very nice transformer for the 45 tube. You could use this tranformer with a 2A3 in a low powered circuit, but the 2A3 really deserves a transformer somewhere in the 60 m .......

78: RE: Q about Thorsten's 417 DC 45 amp (5.89)
Posted by Thorsten on 2010-08-11, 10:49:16 (95.154.215.2)
Hi, > I have a pair of Thorsten's 417 DC 45 monoblocks. They are probably more Gordon Rankin's than mine, I just translated his approach as posted here into a Loftin White Circuit. > I want to try re .......

79: RE: Morrison Micro circuit for 45 tube (5.89)
Posted by drlowmu on 2015-02-19, 08:19:58 (71.0.211.143)
hifipaul, We have found, over 26 years, well implemented, that 0.8 mA. through a 7B4 Loctal can directly-coupled drive a 2A3 satisfactorily, ( measured ) - so I would not worry about 1 or 1.2 mA. ( gu .......

80: Re: upper harmonics - Jim’s V5 (5.88)
Posted by danlaudionut on 2006-09-06, 08:56:02 (152.163.101.6)
Richard >>The graph you posted is at *30 watts. At 10 watts... If you only need 10W then why go A2? You'll get 20W without going into A2. How efficient are your speakers? If they're over 90dB then you .......

81: RE: What Eli said... mine is dead quiet through Khorns... by the way... 5842's wear out fast... about 1000 hours~n (5.85)
Posted by Cleantimestream on 2017-07-19, 16:29:53 (73.87.188.18)
PS 8 henry {25 ohms DCR} /Vishay 45 uF/10 Henry {35 ohms DCR}/Vishay 45 uF LED bias 45 output tube. Star ground to a 1969 Kennedy half dollar {40% silver/60% copper} was not necessary to lift ground a .......

82: Comparing Sound of Output Transformers for SE 45 (5.85)
Posted by David Lawrence on 2005-06-21, 18:46:18 (24.79.143.221)
Can anyone suggest to me the likely differences in sound for an SE 45 amp of the following transformers: Tango XE20S James 6123HS Magnequest DS-05 (Of course there are Tamura and Lundahl, but the abov .......

83: RE: Haven't seen Naz post for a while. (5.84)
Posted by Lew on 2019-11-13, 07:54:02 (71.163.180.237)
Naz privately sent me a couple of phono stage schematics using the 6C 45 in an LCR type circuit. He built at least one, with inductors custom wound for him by Dave slagle. I hope it's OK to reveal tha .......

84: RE: 6SF5 to 45 design help (5.83)
Posted by johnsonad on 2014-08-24, 08:28:57 (75.80.41.11)
Guys, about two years ago there was some great discussion on this circuit. I had a Fi X around that time and this is nearly a part by part match for the amp. Don has had great success with it. The X w .......

85: RE: Agreed, but a circuit optimized to drive a 2A3 will sound Lifeless driving a 45~nT (5.83)
Posted by Cleantimestream on 2019-05-07, 09:35:14 (50.234.237.37)
just keep building them Vinnie. Here is one of 11 I have built. These were mono blocs from a George Wright Schemo driving 2A3's into A2. I can run either tube by adjusting the circuit via rectifie .......

86: No free lunch !!! (5.82)
Posted by drlowmu on 2008-09-03, 05:51:02 (76.0.20.186)
Hi, A question for you: If the circuit is running the tubes so hard as to melt solder out of the pins, than is that a problem of the tube, or of very POOR audio design? I had a friend in Oakland tell .......

87: Re: Ed is just a happy customer.... (5.80)
Posted by Ivan303 on 2006-09-04, 06:47:30 (12.72.181.157)
Ed has built other amps that have a similar topology, IIRC. I think the circuit design belongs to Josh Stippich of ElectronLuv, but it's pretty simple. Choke loaded 45 driving an 845 via parafeed 5K:5 .......

88: Re: Ideas-very appreciated. (5.80)
Posted by glc on 2004-02-05, 14:43:01 (80.116.18.95)
Hi Gordon, again many thanks for your qualified help. It is a lot interesting for me to improve my circuit with the help of your big know how and experience. I will order the components and in next da .......

89: Considered a triode strapped 1619 lately? (5.79)
Posted by Steve O on 2005-12-05, 19:39:36 (12.75.21.78)
Although a 2.5V directly heated 6L6 beam tetrode variant, its chacteristics are similar to a 45 when triode strapped. In a lot of circuits it can sub for a 45 w/o circuit change although base is total .......

90: Re: Can the 27 or 56 be uesed in SRPP circuit to drive 45's? (5.74)
Posted by GKwei on 2003-04-11, 06:51:11 (66.87.84.134)
Christian Rintelen has a 56 -> IT -> 45 amp on his website: "www.rintelen.ch" You will have to search around a bit, it is under "aMorph", and he uses it a a mid-range amp for a TAD 4001/Altec 15" woo .......

91: A few questions about the Bugle 45 (5.72)
Posted by Docgab on 2003-04-07, 06:56:37 (68.107.248.50)
I am considering building the Bugle 45 as my second DIY project. My first project was a very nice 27 based pre-amp with battery biasing and tube voltage regulation (Many thanks to Skip for all the hel .......

92: 56 drive 45? (5.71)
Posted by EZ_Angus on 2003-07-20, 05:57:38 (68.97.45.96)
Jim Jeff & Dave, thanks very much for your suggestions on driver tubes. Any further thoughts on a choke loaded 56 driving the 45? globe 56's may be rare, but I can't find even a picture or anyone sel .......

93: RE: New project, voltage checks good, blows fuse after 45 minutes and power transformer hellaciously hot and odd smell (5.65)
Posted by kobasa@xs4all.nl on 2020-08-29, 07:52:55 (82.95.217.48)
No, the circuit tell us that the current for the 46 is 23mA. Check if you have the same voltages on anode and kathode as in the circuit. .......

94: SET 45 C4S circuits (5.63)
Posted by waveboxes@yahoo.com on 2005-12-11, 17:04:37 (24.99.31.31)
I just completed a Set 45 Cathode Follower homebrew and I want to add C4S circuits to the mix..I need a little help to determine the R1 and R2 resistors on the source and sink circuit boards..I have .......

95: Re: 56 drive 45? (5.61)
Posted by Jim A. on 2003-07-20, 06:54:14 (198.81.26.9)
Without doing the math, I'd use a choke with, oh, 60H inductance minimum (maybe more on account of 9K Rp) to ensure adequate bass response. The higher quality, the better: Jack Elliano or Mike LaFevre .......

96: RE: GZ34: getting too much voltage drop (5.59)
Posted by vetmedrobert@gmail.com on 2017-02-11, 07:33:11 (104.247.227.181)
You have 670 volts into a choke. the formula is VAC*0.45, or 670*0.45= 302.5 volts. This for a full wave rectifier as you have in your schematic. Then you must allow for the rectifier voltage drop whi .......

97: Re: Power Trans In Barbour 45? (5.59)
Posted by Eli Duttman on 2006-07-11, 17:50:58 (69.242.20.145)
It looks like the 6X4 is a 70 mA. type. That implies the the P-T270CAX is appropriate. The 7Y4 Locktal base is an inexpensive 6.3 VAC heater rectifier suitable for use with that trafo. I'm unfamiliar .......

98: RE: 43% Ultralineal Trafo (5.57)
Posted by Michael Samra on 2009-10-26, 11:44:07 (97.84.146.37)
You made an error in a calculation because typically you want to divide the output secondary voltage into the input primary voltage which would be 252 divided by 5.6 which would be 45.Now,since you ar .......

99: Advice on how to drive a power triode(45) with power triode(71a) (5.55)
Posted by Docgab on 2004-01-09, 14:16:45 (68.11.54.194)
As far as circuit design, is there anything special about using a power tube in the gain stage of a power amplifier? For example, 71a driving a 45 or vt52. Signal to the grid of the 71a and plate of 7 .......

100: Re: It has been done . . with a trannie (5.53)
Posted by Dave Cigna on 2006-09-14, 16:08:00 (70.98.225.113)
Rick, I suspect the 45 driving an 845 through a 1:1 would work great. The 1:1 is relatively easy... I also suspect that driving a 45 through a 1:5 stepup would work if you're using a typical CD player .......

101: I need help understanding a circuit (5.51)
Posted by hifitom on 2002-03-28, 17:30:43 (12.215.201.155)
Can someone help me by identifying the driver circuit used here- http://members.home.nl/triode.dick/tekeningen/45_2a3_se_amp.gif This circuit has been recommended and would easily fit into my 76/45 am .......

102: RE: I like the Tri/pent for those trafos as there are no surprises. (5.51)
Posted by Tubecase on 2016-04-30, 06:23:30 (84.28.51.211)
Hi Michael, Thanks for this schematic. Do you perhaps have an idea how much output voltage ('swing') this circuit can do (within reasonable distortion)? Would it for instance also be suitable to use t .......

103: Beautiful! (5.47)
Posted by amandarae on 2009-01-12, 16:27:28 (71.104.53.243)
Congrats! I too have the 2A3/45 amp from JE's circuit design. I have been enjoying mine since April last year. I noticed you are using an ST 5Y3 rectifier. May I suggest the RCA ST 5Y3. If your voltag .......

104: not the best value choices... (5.46)
Posted by Joelt on 2004-01-16, 07:37:56 (208.198.191.182)
>>...Ra=33k, Rk=820 Ohms, bypassed with three "poly" capacitors - 10u, 10u and 68 nF. Input grid leak resistor is 1 Meg. RC coupled to 45, 2uF + 220 k (grid leak for 45)...>> The plate load is too sma .......

105: RE: 45-PP: has anyone made one or seen/heard one or seen a schematic? Nt (5.44)
Posted by SomeJoe on 2011-03-20, 11:21:54 (98.77.119.66)
Here's a PP 71A. Simple circuit that can be easily adapted to the 45. Another highly regarded design is the Seth PP 2A3: http://www.magnequest.com/diy_lessard_2a3pp.htm .......

106: RE: Morrison Micro circuit for 45 tube (5.41)
Posted by wclarson12 on 2015-02-20, 08:57:29 (100.40.163.12)
Paul, actually not having heard it yet I will not decide J C Morrison must have liked it. For starters I'm going to follow the schematic. I have read that paralleled dual triodes lower noise and were .......

107: Help needed, very confused. (5.40)
Posted by DOc95gab@gmail.com on 2020-12-29, 11:02:36 (45.132.115.88)
Power supply is a 250-0-250 81 mA transformer with a 5AR4 rectifier. B+ voltage is 250V. At this point I must be doing something wrong. I thought that I had a very basic understanding of Ohm's law .......

108: Best replacements for Elna Cerafines in Bugle 45 PSU circuit (5.39)
Posted by tweakydee on 2009-03-13, 07:27:54 (68.33.192.12)
The power supply 100uF Elna Cerafine caps in the original Bugle 45 amp article are no longer available, what would be the best caps available now to replace them on a moderate budget? It requires 4 10 .......

109: My next Project for discussion.... (5.38)
Posted by Thorsten on 2001-10-16, 05:14:39 (195.99.125.203)
Hi all, I have a few irons remaining in the fire and a pair of all out, all WE 300B Monoblocks (WE310A (P) -> WE311A (T) -> WE 300B + WE 274A Rect - with multiple feedback loops , similar to the Shind .......

110: RE: PSE: different coupling caps (5.38)
Posted by dave slagle on 2009-05-06, 14:05:21 (67.189.148.56)
Why do you think you would want the tubes matched in a PSE circuit? In theory if you could put an 845 in parallel with a 45 couldn't you get the beauty of the 45 and the power of an 845 (big) ;-) If ( .......

111: RE: it's the truth ... (5.38)
Posted by deathtube 667 on 2022-01-31, 07:53:10 (8.226.1.108)
Even JDM, a man at the side of DF for over a decade at RMAF, failed to replicate the SS 2A3 circuit exactly and moved on to other finals like 45, KT88 and now 6005. Only DF can build his SE 2A3 circui .......

112: I need a little help with wiring 5ar4 and hum pots... (5.37)
Posted by Docgab on 2003-04-19, 09:45:32 (152.163.188.5)
Building a 45 based power amp (Bugle 45). I think that I understand how to wire the 5ar4 but wanted to make sure. Here goes: the primaries go to the plates, pin 4 and 6. Filament heaters goto pins 2 .......

113: Unbelievable 45 SET..with Gary's circuit. (5.36)
Posted by C.Y on 2003-01-04, 00:06:35 (218.145.25.79)
I completed a 45 SET driven by 6H30. The circuit is identical to Gary Pimm's ' 300B set at http://home.pacifier.com/~gpimm/300b_rev3.htm As a non-EE, I've come a long way to make this one. The kick dr .......

114: diy project topology questions (5.34)
Posted by EZ_Angus on 2003-11-13, 06:11:31 (68.97.45.96)
Hi, I am designing/building a 56 drive 45 (with globe tubes in both cases) SE amp. I am planning to use a choke loaded, directly coupled path from driver to output tube. planning to use (globe) 80 as .......

115: Re: That's great news! (5.33)
Posted by kurt s on 2003-08-02, 12:06:39 (209.148.122.25)
>>Do you think this sonic quality is unique to the 47, or are there lots of other pentodes that may do just as well? Yes, I think a lot of it is the 47 tube I'm sure, just like a lot of the 45PP was t .......

116: RE: Maybe, (5.33)
Posted by Cleantimestream on 2012-10-04, 16:00:40 (24.209.254.171)
The link shows a schemo that I have built. This circuit slightly sounds better than the modified George Wright schemo. George Wright used a 6SN7 per each channel {2A3/45} switchable cathode bias of 7 .......

117: RE: DIY 45/2A3 Circuit Suggestions (5.30)
Posted by xaudiomanx@aol.com on 2009-01-15, 15:02:50 (68.194.254.219)
Jeff, Where can I get a schematic to them? .......

118: Other than one being for 2A3 and the other for a 45 (5.29)
Posted by Chip647 on 2019-05-04, 08:53:43 (108.247.77.70)
I really see very little difference between the two on a circuit level other than the resistor changes to bias the tubes. .......

119: Second that! (5.29)
Posted by DanK tubes on 2009-03-13, 22:45:34 (74.220.74.24)
I built the Bugle 45 circuit into a pair of monoblocks and used 120uF panasonic TSHA caps. Although I never tried the cerifines, the amp sounds great with these. I first used UF1007 diodes for the rec .......

120: Re: Bugle 45 - Preamp required? (5.26)
Posted by arnoldc on 2004-03-04, 02:53:05 (202.164.170.101)
believe it or not, i am using a Bugle 45 with an 89dB Infinity Kappa 200 speakers (i'm still looking for high efficiency bookshelf) with only a DACT-in-a-nice-box. when i was using 5751, it was ok wit .......

121: Re: Opinions wanted on two drivers for LARGE swing (5.24)
Posted by Joelt on 2004-03-26, 14:04:22 (208.255.103.2)
>>Question, does -1 at 25khz matter if the circuit has no NFB?>> No, probably not - but I was hoping to use NFB if I could - so that would then become a requirement. >>P.S. I've been thinking about a .......

122: RE: DIY 45/2A3 Circuit Suggestions (5.23)
Posted by JoshK on 2009-01-15, 20:17:12 (70.111.50.232)
I like the cascaded grounded cathode > CF stage version of Darius over the SRPP version from what I've read about them (Morgan Jones, tubecad, etc). I've heard neither. I haven't taken the time to con .......

123: Re: Seeking schematic for Eric Barbour's single ended glory 45 (5.23)
Posted by Damir on 2004-01-16, 04:38:55 (213.202.69.233)
I have this "Glass Audio", it`s Volume 7, Nr.3 - from 1995. Well, the circuit is based around PP OPTs from Sansui 1000A (he reccomends 4...6 k Ra) and can be used as SE, Ia for the 45 is about 25 mA. .......

124: Re: jolida mod mixed result (5.21)
Posted by danlaudionut on 2006-12-16, 17:15:22 (152.163.101.6)
I cannot agree more that the 12AX7 is the most influential tube in the circuit. Since it is in SRPP (see schematic), go for a 6072 there since that is THE tube that really shines in SRPP (aka Bugle 45 .......

125: hot time in the old cap tonight.... (5.21)
Posted by vinnie2 on 2016-04-18, 05:58:10 (173.189.217.92)
The attached schem is for my version of willie's 26/26/45 amp, at least I think it is. I drew it up back when I breadboarded the amp. It was working at that time and sounding good. I am now buildin .......

126: Agreed, but a circuit optimized to drive a 2A3 will sound Lifeless driving a 45~nT (5.20)
Posted by Cleantimestream on 2019-05-07, 04:44:49 (50.234.237.37)
~! .......

127: early Marshall JTM-45 amps (5.19)
Posted by FenderLover on 2009-12-26, 01:45:55 (63.247.31.12)
Definiely a big difference in tone between aluminum and steel chassis. At least in guitar amp world. For exmaple, the early Marshall JTM-45 was a near clone of the famous Fender Bassman (5F6A circuit) .......

128: Re: 45 into an 845 parafeed circuit (5.16)
Posted by Naz on 2006-09-04, 18:04:00 (202.172.104.29)
Hey Dan, I have no doubt this circuit will sound darn good but I'm wondering why anyone would use an 845 at 400-450V only good for about 2W or even less depending on the primary impedance of OP tranny .......

129: RE: Morrison Micro circuit for 45 tube (5.14)
Posted by wclarson12 on 2015-02-20, 09:36:36 (100.40.163.12)
I guess that's been answered. increase the cathode bias resistance .......

130: RE: 6550 SE CCS VR tube screen shunt reg debugging (5.14)
Posted by PakProtector on 2017-05-10, 13:38:50 (23.125.73.217)
You could try to get the CCS set at perhaps 45 mA. It would cover the consumption, plus the maximum the VR tube will sink. When cathode biased, it is quite conceivable that you are drawing too much f .......

131: Re: Vanishing DRD Kathode Resistor (5.13)
Posted by Brian C. on 2003-08-17, 00:22:20 (81.111.8.50)
Hello Brian. I prototyped what I call a "Monkeypole" amp where the bias for a 45 was entirely provided by the drop across a custom 1400 ohm 200H anode choke. By using a 6S45P I was able to eliminate t .......

132: main power supply delay circuit for B+ voltage (5.13)
Posted by Ewing on 2004-05-11, 23:17:46 (202.40.210.164)
I would like to use the following circuit as a main power supply circuit to delay my B+ voltage which is a SS design. Anyone know how to manage the delay time by using appropriate C2 and C3 capacitors .......

133: Ping Gordon R – a pre for dynamics & detail - a 45? (5.13)
Posted by rick57@optusnet.com.au on 2006-05-30, 07:14:19 (211.28.196.246)
Hi Gordon I’m gathering my final bits to put together my first amp - the Bugle. About the only variations will be: monoblocks, and in lieu of Cerafines, ASC motor run caps. (In an active system, from .......

134: RE: PP 45 schematic? (5.12)
Posted by xaudiomanx on 2018-02-03, 15:05:38 (74.88.152.59)
Hi Vinnie, Actually it is very simple as far as the circuit is concerned. I think what you are looking at is something drawn up that isn't very clear or could be a bit neater. I myself, have a hard ti .......

135: Where to Troubleshoot my Bugle 45? (5.12)
Posted by kwvogel on 2006-12-25, 18:44:27 (75.100.86.22)
Hello- After a couple of Bottlehead kits, I have been ever-so-slowly assembling Gordon Rankin’s “Bugle” 45 amp ( schematic here ). I’ve got it all hooked up and it actually plays music (!) but the B+ .......

136: RE: New project, voltage checks good, blows fuse after 45 minutes and power transformer hellaciously hot and odd smell (5.10)
Posted by vetmedrobert@gmail.com on 2020-08-29, 07:05:35 (142.127.22.126)
Cap input. The circuit is the JE Labs simple 46. My arithmetic tells me the circuit should draw about 46 ma :) Turns out that it seems to be drawing about 65ma :( Since the power transformer is rated .......

137: Re: What to use with this OPT (5.10)
Posted by Paul Barker on 2002-12-06, 01:09:43 (62.252.196.183)
How about a 45 amp? Maybe Gordon's Bugle? Someone here could direct you to the Valve issue which hosts the circuit and description. .......

138: Re:Unbypassed pentode output stages.... (5.09)
Posted by Jimmy on 2005-04-25, 15:08:05 (69.179.106.157)
Others have reported the same. These 45 tubes in circuit are not receptive of removing the bypass cap. .......

139: Re: Dumb Question-What drives what in a mini-dual triode in SRPP? (5.09)
Posted by Docgab on 2003-05-01, 18:58:54 (68.107.248.50)
I guess that I need to give a little more info. When looking at the pins on mini-dual triode (12ay7 for the Bugle 45) the number one pin is to the left of the gap and the nine pin to the right. pins 4 .......

140: Re: Can the 27 or 56 be uesed in SRPP circuit to drive 45's? (5.06)
Posted by Mike C on 2003-04-14, 00:51:07 (136.8.159.11)
Have you considered using the triode you like with a pentode active load, in Alan Kimmel's mu stage circuit. Don't forget, the pentode is not the amplifying device - it is the load for the pentode, an .......

141: RE: I just love those 45's.... (5.05)
Posted by wclarson12 on 2015-02-13, 13:14:34 (100.40.163.12)
I'm sure I a am not the only person who would like to see a schematic of this circuit that's working so well for you. I have never posted on here before. Hello to all I enjoy reading about your advent .......

142: RE: Has anyone actually used the MQ "robin hood" trannies? (5.04)
Posted by danlaudionut on 2010-02-14, 11:13:16 (64.12.116.16)
Vinnie I searched the Magnequest Asylum and here are three that I found - In this particular circuit, the Simple 45, I got the EXO-45 sounding good but couldn't get rid of the last bit of glare on lou .......

143: Re: Very sweet, low budget 45 SE amp (5.03)
Posted by Ivan303 on 2002-04-01, 06:24:15 (172.168.181.158)
Would you share the circuit drawing? Murcury Vapor rectifier sounds interesting, and I have a slew of 6SL7's. .......

144: RE: B+ voltage appears to crash when tubes wired in (5.00)
Posted by Paul Joppa on 2020-11-25, 15:11:44 (73.169.153.194)
Without a circuit, it's harder to tell. But a classic is installing the 45 in the wrong socket holes ... .......

145: GZ34: getting too much voltage drop (5.00)
Posted by banpuku on 2017-02-11, 06:13:55 (50.80.146.114)
The GZ34 rectifier is supposed to have a voltage drop of 17V. Per the attached schematic, it appears as though there is too much voltage drop, as the voltage measured at the GZ34 pin is 290V. Is this .......

146: Loud squealing noise in new project (4.99)
Posted by vetmedrobert@gmail.com on 2020-09-27, 15:33:14 (142.119.47.168)
I just finished a 45 circuit closely based on Ale Moglia's 7193/45 schematic. Plate and cathode voltages measure very close to the desired voltages in both channels, with a dummy load and inputs sh .......

147: Re: Does anyone here do a design for a fee? (4.98)
Posted by nl on 2006-08-20, 09:30:16 (69.177.3.220)
There are a number of people who will design and build something for you. I think $500+parts might get people interested. Also, you might ask around for someone who has already built something similar .......

148: What's wrong with this gain stage? (follow-up to my earlier collapsing fixed bias problem) (4.97)
Posted by Doug Flynn on 2005-03-11, 20:08:19 (144.138.159.202)
Hi chaps Here's a schematic of the first stage in my 6J5GT-45-300B SE amp. Everthing works fine when it's powered up. However, when an AC signal (bigger than about 2 volts) is applied to the input the .......

149: What do you get when you place 10 designers in a room? (4.97)
Posted by Gordon Rankin on 2006-04-05, 07:19:25 (216.68.187.167)
JJ2, You get 10 totally different amplifiers. I really hate it when people say that a tube say the 45 or the 300B sounds like let's say x. Gang it's not the tube, it's the circuit. I have made 172 dif .......

150: RE: 300B sounding as clean & clear as a 45 ? (4.97)
Posted by kurt s on 2010-09-11, 00:17:35 (118.172.30.122)
I used a clean nimble powerful driver and chose the 300B-XLS version from KR (or get EML). Then you can get 10W or more of excellent clean 45-ish sound. I was successful with my CCS'ed Amperex 7119 -> .......

151: Re: 45PP amp picture and schematic (4.96)
Posted by Kurt Strain on 2002-05-03, 08:00:10 (192.25.142.23)
* What's a rough parts cost for this amp, if I had to buy everything? Are any of the parts custom made or not readily available? I think you said one of the transformers was pulled from an Eico, right .......

152: My idea, also link to PDF of the Sound Practices Article (4.96)
Posted by Gordon Rankin on 2002-04-17, 14:35:20 (66.161.186.14)
The reason the 27.4K is there is too isolate the B+ from the input SRPP and to also lower the noise placed on the plate of the upper triode. You can see that I bypass the 27.4K to ground with a 10uF c .......

153: Can I sub a GZ37 for a 5U4G in a.... (4.96)
Posted by Jovy on 2003-06-09, 02:18:01 (202.163.247.130)
JE SRPP 45 circuit? Would any changes be necessary? I prefer using slow-start recifiers. Thanks in advance, Jovy .......

154: Re: Need Advice: Trying 45 triodes in a 2A3 Circuit (4.96)
Posted by David Lawrence on 2005-03-30, 16:40:24 (130.179.12.107)
Hi, Would the output transformer's 3K primary work well? Thanks again, David .......

155: RE: Morrison Micro circuit for 45 tube (4.96)
Posted by wclarson12 on 2015-02-18, 10:07:26 (100.40.163.12)
Thanks that was fast! I have some wirewounds coming in and I could start with 5K. They are Chinese, they look good but we'll see. Aluminum case and all. .......

156: RE: Uh-oh.... (4.95)
Posted by silverfox_at on 2008-12-18, 12:34:12 (212.186.34.194)
hi folks, I`m newly registered here, but reading in your asylum since several months. also congratulations from me, and let me tell you, this circuit may be "simple", but it`s great. I built this amp .......

157: RE: Sorry, can't agree with that at all... (4.95)
Posted by tube wrangler on 2008-11-30, 21:05:42 (65.219.130.162)
Once upon a time---- I used to think that way too! But then I worked, designed, built and studied, and graduated to a higher level of performance. There are so many variables that we could argue f .......

158: RE: New project, voltage checks good, blows fuse after 45 minutes and power transformer hellaciously hot and odd smell (4.94)
Posted by kobasa@xs4all.nl on 2020-08-29, 09:33:47 (82.95.217.48)
Which post? Where did you post RCA data? You wrote that you use 'The circuit is the JE Labs simple 46' So i follow that circuit and the total current is about 48mA, 23mA for each output tube and about .......

159: Help with 2A3 Amp (4.92)
Posted by LeBob on 2005-09-15, 19:37:20 (165.121.228.58)
I originally bought a pair of James 6123HS transformers with primary impedance taps at 2.5k, 3.5k and 5k to build a WE91A amplifier. Already having a number of 2a3 and 45 tubes has made think I should .......

160: Tube/OPT impedance matching: PX25 and 300B (4.92)
Posted by dth31 on 2004-03-03, 06:53:34 (68.46.95.235)
I am considering building an amplifier in which I could, with a few simple changes, be able to swap in/out a PX25 for a 300B. I am curious what the amp designer may have empirically observed with tryi .......

161: RE: I'm just the reporter on this one (4.92)
Posted by RC Daniel on 2012-09-05, 01:50:04 (58.165.65.204)
No doubt, you have read the information on the Electra-Fidelity website: http://www.electrafidelity.com/intermodulation-distortion-imd/ http://www.electrafidelity.com/silver-45-se/ A little info can b .......

162: power supplies (4.92)
Posted by rick57 on 2006-12-02, 05:17:23 (58.107.189.194)
To my limited knowledge, Tubelab’s Power Drive likely works very well and is very cost effective. Wrt power supply, I'm on a parallel search. I’m taking my time considering the best options for an 845 .......

163: RE: Well rats....... (4.91)
Posted by chrismercurio on 2014-10-08, 13:27:33 (17.207.198.146)
I remember the 845 Dinosaur circuit from SP...but why would someone want to use a 211 at such a low voltage? Is it for safety? Otherwise, why not use an easier cheaper tube if you only need a few watt .......

164: Re: Single 45 Amp question and pics (4.91)
Posted by mwiebe on 2007-03-01, 04:32:28 (71.213.162.106)
Nice looking amp, great job on putting it all together. Those voltages are fine, though looking at the schematic I would expect it to be a bit higher if you built exactly to that schematic. Have you c .......

165: New project, voltage checks good, blows fuse after 45 minutes and power transformer hellaciously hot and odd smell (4.90)
Posted by vetmedrobert@gmail.com on 2020-08-28, 20:17:10 (142.127.22.126)
The circuit draws around 48 ma, the PT is rated 58ma in FW CT with a tube rectifier. All dc voltages are within 5% of circuit values. Lousy transformer or what? Any thoughts? FWIW the PT is a Hammond .......

166: I'd like to post a schematic for my new shunt regulator... (4.88)
Posted by Mark Kelly on 2002-07-01, 16:38:01 (203.87.83.9)
But I don't know how. Do I need to use an external image hosting service, and if so can someone point me to one? I posted before on the subject of shunt regulators, asking whether anyone knew of a goo .......

167: also... (4.87)
Posted by Jim Dowdy on 2014-03-19, 14:41:54 (50.147.222.176)
Shigeki Yamamoto - famous for his Teflon sockets and his 45 amp kit. And: Soya Susumu - auteur of the directly-coupled dynamic A2 circuit. .......

168: effect of AC heating on 45 DHT filaments ...w/graph (4.86)
Posted by deathtube 667 on 2015-06-18, 13:02:22 (24.140.98.34)
After reading what was posted on Tube Lab's webpages about heating DHT filaments with 60 cycle AC, I decided to look at my SE 45 breadboard circuit. I put a 1KHz sine wave into the input of the amp .......

169: What mods should I do on this circuit to use my 5751s? (4.86)
Posted by pastito on 2004-09-19, 20:54:01 (200.61.130.237)
I will study the material you sent me tomorrow. I am very grateful because this is exactly what I needed to get started. I will buy a pair of 45's and a pair of Chinese 2A3 and go for it. Thanks again .......

170: Seeking help about my 2A3 to 45 conversion (4.84)
Posted by arnoldc on 2003-06-10, 06:50:13 (202.164.170.98)
I've been happy with my JE Labs SRPP 2A3 since i made it. A recent opportunity allowed me to secure a pair of Cunnigham CX-345. Since the SRPP 45 of Esmilla is very similar to its 2A3 version, I conve .......

171: Re: Help with 300B SET amp (fixed bias goes wild with AC signal) (4.82)
Posted by Doug Flynn on 2005-03-09, 16:01:33 (144.138.159.105)
Hi Michael, thanks for your reply. Both channels are on the one chassis. As it's a SET amp it's class A in all stages. The bias transformer is a tektronix unit which can deliver about 200mA - more tha .......

172: Re: 45 into an 845 parafeed circuit (4.81)
Posted by danlaudionut on 2006-09-06, 17:10:25 (152.163.101.6)
Naz He may like the sound of the 845 but didn't need that many watts. I would guess for the bass control mostly. He did try it at 900V but liked it better at the lower voltages. DanL .......

173: RE: DIY 45/2A3 Circuit Suggestions (4.81)
Posted by sheldone on 2009-01-15, 21:42:34 (70.181.154.72)
In my experience, it works very well. The quietest tube amp I have. Here's the amp. Note the size of the caps (all film). Sheldon .......

174: RE: 845 Driver (4.81)
Posted by Neff on 2009-12-10, 09:46:00 (72.61.57.220)
No experience with 6BX7 or 6BL7. Could be a less than great sonic performer? I could use a 45 power tube as driver driven by a 6SN7 MU circuit. .......

175: What makes a good driver stage circuit and tube? (4.81)
Posted by Docgab on 2003-06-01, 13:34:27 (68.107.248.50)
Thanks to all who responded to my question about interstage transformers. The thread got a little off subject. What makes one tube better than another for a gain/driver stage? Secondly, what is impor .......

176: This circuit appears capable of that voltage swing. (4.78)
Posted by Ralph on 2021-12-21, 13:22:23 (75.168.97.248)
The cathode follower driver has 200Volts on its plate. The cathode itself is at -45 Volts which apparently is the class A bias point. It will have no troubles swinging 70 Volts in either direction (to .......

177: 45 single ended amplifier advice wanted (4.77)
Posted by maxhifi on 2006-04-13, 08:56:02 (198.103.167.20)
I have a couple of really nice Sowter 5000 ohm single ended output transformers I had made a few years ago for a 6V6 SE amplifier which never got off the ground. Can anyone suggest a circuit to use wi .......

178: RE: 45 set amp ,question (4.76)
Posted by MartinRamon on 2009-09-20, 08:54:50 (190.27.54.179)
Thanks Rob, Using the circuit of the Sun Audio or Glory Set for your 50?, that value using grid choke for 50?, Thanks .......

179: Re: Are you meeting critical inductance? (4.76)
Posted by elblanco on 2005-01-27, 15:27:17 (24.35.77.186)
interstage xformer! I love it!! you are the man!! there's nothing like a xformer for phase split...... ever seen the circuit with 45 or 46 driving two 46s thru xformer? .......

180: OK, make you a deal... (4.76)
Posted by korneluk on 2003-05-10, 12:40:18 (68.211.135.171)
Deon, If you get the 45, IT, 845, parafeed circuit working nicely, I'll optimize it to drive the 833A. Let me know when you have a first-pass schematic and keep in touch, -- jose k. jose_korneluk@bell .......

181: RE: DIY 45 amp (4.74)
Posted by maxhifi on 2007-08-21, 13:15:10 (198.53.67.86)
Getting it working should be pretty easy, just choose a simple circuit. I built something similar unsing an EF37A driving a 2A3, and I am sure many others have too. Pay attention to layout - copy some .......

182: Re: Is there audible difference between Hammond 1627SE & 125ESE, for 2A3/45? (4.74)
Posted by BofService on 2004-09-20, 12:04:20 (12.168.24.203)
I have not yet compared my 125ESEs to my Lundahl 1623s in the same circuit. However, I've compared a pair of Magnavox OEM SEs with the Lundahls (in the same circuit) and seen a huge improvement in ba .......

183: 2-stage 845 SE schematic (Jim, Dan, anyone?) (4.73)
Posted by rick57 on 2006-09-12, 16:51:14 (211.26.193.93)
Hi I want to breadboard & compare an 845 SE 3-stage (for which Jim and especially Dan have kindly shared two very nice looking circuit, and revised component values on one), with an 845 SE 2-stage. (Y .......

184: RE: 45-PP: has anyone made one or seen/heard one or seen a schematic? Nt (4.71)
Posted by tubebuilder on 2011-03-21, 22:01:18 (58.106.37.108)
I don't get it. Why would you use 2 45's in parallel? Why wouldn't you just use a 2a3? Saw these single plates today. This guy must of grined when he found these in an old theatre amp or so he says. I .......

185: Re: You say you are measuring a small Dc voltage. How? (4.71)
Posted by BofService on 2004-11-19, 07:36:27 (12.168.24.203)
JE Labs SRPP 45 amp (see schematic at link below). With amp connected to dummy outputs (and volume pot turned all the way down) and DVM connected between the .22uf cap and the 1k and 470k resistors (a .......

186: Re: Amity/New York 2A3 PP Amp (4.71)
Posted by gman on 2003-03-03, 18:13:23 (68.165.2.190)
I did this a while ago, with both 2A3's and 45's being driven through a LL1635 by 7119's or 5687's. you get a little more bass with the 7119's (maybe because lower Rp?) but both sound good. I'm still .......

187: RE: Medium power SET + minimonitors (4.71)
Posted by kurt s on 2007-12-01, 09:29:10 (69.19.14.31)
I have built a 45 amp that produced 2.5 watts running class A2. I even did that without a follower. I just ran a 6H30P driver at 15 mA CCS current and when it swung high that big driver current all fe .......

188: RE: Two thumbs way down! (4.70)
Posted by Marantzguy on 2007-06-07, 11:25:57 (128.48.7.107)
Hi, Triode Kingdom: I want to make one thing quite clear: I am NOT an engineer. My hobby is the collecting of and use of some pieces of vintage audio gear, most of it tubed. I have not heard anything .......

189: RE: Best replacements for Elna Cerafines in Bugle 45 PSU circuit (4.70)
Posted by mach1 on 2009-03-13, 19:51:21 (202.7.199.45)
If you don't have the real estate for oilers or film caps I would go with panasonic TSHA or TSHB, which are probably every bit as good as the cerafines. .......

190: RE: my error ... (4.69)
Posted by deathtube 667 on 2014-10-02, 09:57:51 (24.140.98.34)
I should have written SE DC 2A3/45 design guide based on alternative circuit design and construction concepts inspired by Dennis Fraker of Serious Stereo. .......

191: RE: excuse the typo.. it is a 6AQ5 amp (4.69)
Posted by JANDG on 2008-08-30, 19:38:35 (4.178.186.89)
If that is a chalk board that is extremely cool........anyway, I am on a venture to learn FPK practices for SE projects. I really like UL with 6v6, 5881, etc..so I figure if I go on a venture of learn .......

192: Re: strange circuit (4.67)
Posted by jeff mai on 2005-03-20, 15:41:10 (203.217.36.64)
I thought about trying this a while back. A 45 would bring the current down so as to not cook the 0D3. If you want to use the 2A3 you might divert some of the current around the 0D3 with a parallel re .......

193: RE: Well...... (4.67)
Posted by Tre' on 2016-04-29, 16:39:20 (76.90.39.24)
That is not a complete schematic. There are at least two things missing that have a direct impact to the question at hand. 1. What is the DC resistance of the power supply chokes? 2. What is the DC re .......

194: Should I be concerned with abnormal frequency response with multiple interstages? (4.67)
Posted by Doug Flynn on 2005-12-08, 21:17:31 (144.131.126.235)
Hi chaps I have a built a 3 stage SET amp consisting of a 6J5GT (loaded with Lundahl LL1660/10ma IT wired for 1:1) into a 45 (loaded with LL1660S/25ma IT wired for 1:1) into a 300B. The 6J5GT has batt .......

195: Re: SE CAD Gurus? (4.66)
Posted by Vinnie on 2003-06-18, 03:33:20 (24.74.187.123)
Hi Grover Have you found it to be accurate in the values it predicts? If so I must be doing something wrong becuase when I plug in values for a 45 circuit I have breadboarded, I get way different valu .......

196: RE: I just love those 45's.... (4.66)
Posted by deathtube 667 on 2014-11-09, 03:53:07 (24.140.98.34)
Doesn't a parallel input stage induce "skewing" effects audible on better high efficiency speakers? Or is it a 3 stage circuit? I am surprised that you did not comment on that design element. ::: TOP .......

197: RE: RCA Phono Preamp (4.66)
Posted by Paul Joppa on 2019-01-20, 21:48:30 (73.97.163.58)
With respect to gain, the discussion at the bottom of the posted circuit gives a gain of 150 (43.52dB) but the note just under the circuit itself gives 550mV/3mV, or 183 (45.26dB). Plus, the circuit s .......

198: Re: Loftin White Circuit (4.66)
Posted by Jim Dowdy on 2004-04-08, 07:24:39 (12.219.133.27)
At a minimum, the 51k resistor will need to be increased until proper bias is achieved for the 45. Note: directly-coupled circuits are not easily tweaked. Mr. Asano would be your best source for assis .......

199: 45 vs EL34 (4.65)
Posted by Fullrun on 2005-02-28, 11:11:11 (68.36.46.10)
I know that this is not only a real apples and oranges question, but also almost impossible to answer beccause it is so dependent on the individual circuit. But for those of you who have heard these o .......

200: RE: diy schematic choice (4.65)
Posted by Michael Samra on 2013-08-27, 00:40:32 (97.84.194.114)
Sam That iron is incredible in the 1000a and I can tell you the truth.You could easily build a 45 watt per channel amp out of that iron or more but if you don't,that receiver is so good that a recap i .......

Found 200 records in SET Asylum.

1: RE: any EML 45G user? how does it compare to the standard EML 45? Thanks(NT) (7.11)
Posted by astralnavigator on 2010-01-03, 09:09:12 (76.64.23.111)
All EML 45 mesh plates tubes are "bad" when used in a standard 45 circuit. The mesh, as clewarly stated on the spec sheet, does nmot have the dissipation of a solid plate 45 and will burn up rapidly i .......

2: Re: Jeff Korneff 45 amps (7.11)
Posted by Bob_C on 2001-01-31, 10:51:16 (151.202.138.163)
Can you tell us something about the circuit. Is it just the simple 45 circuit that Eric B. did in GA many moons ago. Bob .......

3: RE: Verdier 45 (6.91)
Posted by etch on 2008-10-28, 13:28:48 (76.111.61.3)
I would consider a DRD amp, see if Jack Eliano will build one for you. The DRD circuit has more bass dynamics than the usual cap or direct coupled two stage circuit. The latest Bottlehead 45 amp is su .......

4: winning circuit (6.88)
Posted by njjohn on 2004-02-24, 19:16:18 (64.12.96.9)
I believe this circuit, a 27/45, is a winner and with webster opt's, I just cannot imagine what a better amp might sound like. The 6sn7 part is using the srpp circuit, and is put on a seperate chassis .......

5: Not unless you modify the circuit (6.86)
Posted by Jeffm on 2003-01-25, 10:19:53 (172.130.103.54)
I am pretty certain that you cannot use a 45 in this amp without some circuit modifications since the 45 has a different set of operational specifications than the 2A3 and of course the 300B. I'm not .......

6: 6SN7/26/45 (6.65)
Posted by Paul Folbrecht on 2009-04-03, 13:39:20 (12.168.47.9)
Can somebody tell me the origins of this circuit? And who's currently building them (if anybody)? [njjohn - I know you love it. I've read your posts saying you prefer it to the 717-45 circuit of the Y .......

7: Tone (6.63)
Posted by Gordon Rankin on 2001-05-28, 11:30:49 (216.68.177.151)
Mark, I hate to say this but I agree with Jim Ricketts. It is usually more the circuit than the tube. Take for instance running a 45 on DC or AC heaters. On AC the 45 has some of the best midrange pos .......

8: Direct Reaction Drive (DRD) schematic for 45 tube? (6.56)
Posted by K.T. on 2003-04-12, 16:46:19 (24.239.179.119)
Does anyone have a schematic for the Direct Reaction Drive circuit that's biased for the 45 tube? Here's a link to Jack Elliano's original DRD 300B circuit from Vacuum Tube Valley. I don't have the te .......

9: RE: Antique Sound Labs 2A3 Tulip ASL and Klipsh Heresy IIIs (6.33)
Posted by Cleantimestream on 2012-05-03, 09:45:12 (65.27.224.217)
I built my own version of George Wright mono blocs {I have his 2A3 circuit [xeroxed copy] hand drawn by George} and it IS an excellent circuit. He had some novel grounding schemes and thought somew .......

10: Re: ASL Leyla 845 vs Orchid modified for 45s (6.18)
Posted by Thorsten on 2002-01-07, 09:29:39 (195.107.47.212)
Hi, I'm not Jack G, so you may as well disregard my comments. I am quite familar with the Beauhorns though and if your room is not huge the 45's will have enough power. I also have some views on the 8 .......

11: Try this (6.08)
Posted by Jim D. on 2001-07-03, 12:23:30 (149.60.25.2)
One of the most elegant and simple designs for the 45 IMO is the interstage coupled 5842-45. I emailed the circuit to you. I use this circuit and the sound is very nice. Only drawback is the extra cos .......

12: Re: 45 parafeed SET vs. 845 transformer-coupled PP (6.05)
Posted by Doc B. on 2000-06-13, 08:44:40 (209.20.171.145)
Hey Kurt, you might want to try the 845 in a parafeed SE circuit similar to the 45 circuit. Tucker and I scabbed one together a few years back, running at relatively low voltages, I think we had maybe .......

13: RE: FYI: Mr. Korneff is operational (5.93)
Posted by makarushka on 2009-07-21, 08:00:28 (98.248.182.166)
I have two 45 amps made by James Burgess. One is a close variant of the "Bugle" circuit, with an SRPP frontend using 6SL7 tubes. The other one is a circuit that James started making somewhat more rece .......

14: I don't think this is smart thinking (5.89)
Posted by andy evans on 2014-10-28, 11:41:42 (92.2.74.57)
Flame me if you wish, but calling an amp a "45 SET" only tells me that the output tube is a 45. Nothing more. My priority would be: - a DHT input section. The input tube is just as important. 12AX7? .......

15: Wright Sound WPA3.5 w/45? (5.86)
Posted by JJ Analog on 2004-02-27, 10:08:35 (198.128.84.129)
I was not aware that the 45 was a safe drop-in sub in the WPA3.5. Does it depend on which 45, eg. TJ Mesh OK, NOS not? Wright does make a 45 amp which is quite similar, but I'm guessing it at least ha .......

16: I am also waiting (5.79)
Posted by Frihed89 on 2011-06-18, 12:19:13 (94.18.154.151)
My general DHT listening experience is that the 45 is a cleaner, faster, and deeper tube than the 45. The Fi-2A3s monos (and probably the stereo) will take a 45, but the circuit and probably the OPTs .......

17: RE: the schematic ... (5.78)
Posted by deathtube 667 on 2021-05-17, 07:53:16 (50.126.50.3)
It seems that the Korneff SE amplifiers are held in high regard by many. In terms of the schematic : a tube rectified cap input power supply with a 10H smoothing choke and a two-stage cap coupled sign .......

18: RE: a 45 for Trishna (5.77)
Posted by drlowmu on 2015-05-18, 09:20:40 (71.50.29.228)
There is no free lunch. And the Type 45 is "on the money " a wonderful tube, pristine. You will have to use different value cathode resistors, and different voltages, to IDEALLY run each output tube. .......

19: RE: How does the 45 tube sound? (5.68)
Posted by andy evans on 2010-12-14, 00:51:19 (92.3.50.214)
I just want to make the point that a "45 amplifier" or a "300b amplifier" isn't simply the sound of a 45 or a 300b. It's the sound of ALL the tubes in the amplifier, plus the circuit and the power sup .......

20: Sound zombies (5.65)
Posted by njjohn on 2004-02-16, 15:43:11 (198.81.26.7)
"yet these Amplifiers have next to mystical status with respect to sound quality among some people I very much respect and who share my sonic preferences." "mystical status with respect to sound quali .......

21: 2A3 or 45 (5.64)
Posted by Paul Folbrecht on 2006-09-01, 12:08:53 (68.79.229.2)
I hate to start a thread with such a silly, general topic but I'm considering a Fi 2A3 vs. 45 and am gathering as much information I can about the two tubes. I have a 2A3 amp I like a bit no op to hea .......

22: Re: There is a switch to optimize for 2A3 or 45 (5.60)
Posted by Mwalsdor@cscc.edu on 2004-02-05, 21:59:55 (205.188.208.9)
"There is a switch on the underneath side that converts the amplifier from 2A3 to 45. This changes the B+ and the BIAS point as well as the filament supply." So w/o those provisions it would be prefer .......

23: RE: 2a3 verses 45's ... Can someone (5.55)
Posted by Astroimage on 2010-10-09, 09:32:12 (98.226.131.190)
Neff, Great idea on the 45 tubes. The better mid's intrigue me. I will give the 2a3's a shot first then... once I get brave, I'll convert the amp to 45's so I can have a taste of them. I wish they we .......

24: Lets see,the tube was designed to be a telephone signal booster. (5.54)
Posted by Michael Samra on 2013-07-08, 02:07:01 (97.84.194.114)
How linear does it have to be for that? The 300b is also a lot harder to drive than a 2A3 or 45 and those tubes were designed as audio amplification tubes.The anode characteristics you would see in a .......

25: Power Rating EML 45 (5.51)
Posted by cjfrbw on 2007-02-26, 18:30:51 (67.160.232.181)
The web site quotes output of 3.5 watts as opposed to the typical 1.5-2 for 45 tubes. Does this require a special circuit, or can any 45 amp (korneff for example) get this power bump? I also assume th .......

26: Tried 45's with the fi X amp? (5.50)
Posted by Qman on 2010-01-27, 06:55:08 (173.15.79.21)
I've had my fi X 2A3 amp for years and I finally tried it with the 45/5Y3 combo and I really like what I'm hearing. Has anyone optimized the X circuit for 45 's and stuck with it instead of the 2A3. : .......

27: RE: 45 grid resistors (5.48)
Posted by rmyauck on 2012-03-26, 21:20:27 (74.198.151.55)
Thanks Neff! Good 45's are getting hard to find and new production pricy. Maybe JJ 2A3-40 would be a good enough? Those EML 45 or 2A3 probably best though! I wonder how EL84 tyoes or 6973 would work i .......

28: What modification for the 45 tube? (5.48)
Posted by Sebrof on 2014-01-17, 19:52:09 (74.196.162.212)
I'm assuming you didn't just drop a 45 in there. I run that same circuit with 2A3s and would like to try 45s. TIA .......

29: RE: How does the 45 tube sound? (5.46)
Posted by mg16 on 2010-12-18, 12:03:32 (24.154.27.212)
Hi, The improvement in sound is more than subtle with the 6sn7 45. Maybe its the circuit implimentation. I have only owned je labs 2a3 driven by 6sl7. The 45 is Eric Barbours single ended glory. Both .......

30: Re: 45 SET Amps or Amp Kits? (5.45)
Posted by Doc B. on 2001-06-27, 17:16:15 (63.231.50.40)
We will probably offer a 45 version of Paraglow II when it is released. Hopefully we will have this ready by VSAC 2001. The circuit will be very similar to one John's 45 amp designs, just not quite as .......

31: RCA 45 St type............. (5.43)
Posted by vonfont on 2002-11-26, 08:06:22 (172.149.247.88)
I've only only used Rca engraved base ST 45's. With my ed schilling horn they are wonderful. My 2a3 is the sovtek which is has a firmer but less clear bass , and seems less liquid than the NOS 45's. T .......

32: Consider... (5.42)
Posted by Willie The Squid on 2006-06-08, 20:09:07 (63.230.119.38)
Perhaps you should consider building a pair of very high quality, class A, zero feedback, push pull 45 monoblocks. Properly implemented you should get: 1. 4 or 5 strong watts with improved "drive" co .......

33: JE Labs "Deluxe" 300B with 45 (5.35)
Posted by Paul Folbrecht on 2010-03-22, 20:22:03 (65.30.21.134)
Has anyone done this circuit with a 45? I know it has been done with 2A3. .......

34: RE: Nah... good amps, efficient speakers, large room. (5.33)
Posted by Paul Folbrecht on 2008-08-01, 11:34:09 (12.168.47.9)
People seem to disagree on this question. I am not technical enough myself (on this topic) to decide. If it uses 45 operating points and can drop-in to any 45 circuit, how is it not a 45? Anyway, the .......

35: Re: Not an amp to begin with but... (5.32)
Posted by njjohn on 2005-01-31, 00:43:17 (152.163.100.7)
John who builds them could provide more information. I'll send you his e-mail. He copied the final circuit so he could make duplicates at my request. And I think he said something about getting the 26 .......

36: RE: If 50 is the New 40, than 46 is the New 45! (5.27)
Posted by GRechnitzer on 2009-03-16, 16:54:48 (71.50.154.137)
"Putting aside the current rating, have you measured this amp's B+ voltages with the 46 in place? I'm afraid it is running very hard in this 45 circuit, without modification." The 46 tube will have a .......

37: Re: Direct Reaction Drive (DRD) schematic for 45 tube? (5.25)
Posted by GKwei on 2003-04-13, 09:45:59 (66.87.84.134)
Jack built a pair of 45 monoblocks for me about a year and a half ago. These were his first 45's. He sent me a circuit diagram with the amps. However, I believe that you should ask him for a copy if y .......

38: Re: BTW (5.24)
Posted by njjohn on 2004-09-06, 06:54:09 (149.174.164.6)
Don't know much about them, Vacuum Tube Valley but in one of the searches it led to a Gizmo article praising them. Where they went from there I don't know. I wonder if in their issue number 17, if the .......

39: Correction... (5.24)
Posted by Kurt Strain on 2000-06-07, 18:43:55 (209.204.136.84)
>>>Anyone have a comment on how the AVVT mesh plate 45 might sound in a high impedance primary like 5K? Closer to the 45 tonally and as dynamic as the Sovtek? I meant to ask if anyone has heard the AV .......

40: RE: SET 45 (5.22)
Posted by David Lawrence on 2015-04-27, 10:21:57 (24.111.65.90)
I have the old Gary Dahl IT circuit with 5842's to Magnequest RIT5's and then Magnequest DS-050's. It sounds great to me--transparent and sweet. With adjustments, it is the same circuit used for 300b' .......

41: A combination of tube, circuit design, parts selection and build quality (5.22)
Posted by Jeffm on 2004-02-22, 18:54:57 (68.249.107.147)
What you are hearing is a combination of factors: the tube (the 45 removes a lot of electronic grunge and has incredible immediacy), the circuit design (how well the circuit is designed makes a big di .......

42: RE: the schematic ... RCA tube manual ? (5.21)
Posted by deathtube 667 on 2021-05-17, 11:21:23 (50.126.50.3)
"Korneff 45". Jeff Korneff adapted the circuit from a Glass Audio design using old Sansui PP transformers. That design was likely taken from the RCA Tube Manual. A quote from another audio website re .......

43: Re: Can these low powered amps really control the Cornwall's 15 inch woofer? (5.18)
Posted by etch on 2007-02-07, 23:20:17 (71.56.123.154)
Hey Gerry, I built the circuit by Matthew Reidsma called the Experimenter 45, it was featured in SP years ago, very cool amp, funky with the od3's too. Very simple, sounds great! haven't compared it t .......

44: RE: Goodbye Type 45 ....... hello JJ 2A3-40 (5.17)
Posted by Frihed89 on 2016-10-13, 07:03:24 (104.235.176.39)
I agree. It's real close. If you don't have a WE 300B, then the ELROG 300B is the next best tube to my ears. Of course, the amp's circuit and in some cases (depending on the circuit) the driver and re .......

45: 45 driver (5.13)
Posted by Jim Dowdy on 2002-10-07, 06:52:09 (12.219.133.194)
Back when I was working on the Armada [with Harvey Rosenberg and Per Lundahl]; the circuit was designed to utilize either the 2A3 or the 45 as drivers for the 300B series of tubes. It was a VERY sweet .......

46: Re: Sun Rectifier (5.13)
Posted by SETdude on 2003-02-14, 06:43:12 (65.198.222.78)
My 45 amp has two toggles, one allows the 45's to warm up before the other tubes. The 5u4G sound great in it. It's all circuit dependent. I like the metal base Holland GZ34's in my 300B amps. Have not .......

47: Help with 2A3 Amp (5.13)
Posted by LeBob on 2005-09-15, 19:13:41 (165.121.228.58)
I originally bought a pair of James 6123HS transformers with primary impedance taps at 2.5k, 3.5k and 5k to build a WE91A amplifier. Already having a number of 2a3 and 45 tubes has made think I should .......

48: O-Netics SE OPT's-very nice!! (5.13)
Posted by limono on 2008-02-16, 19:05:26 (4.229.60.253)
I thought I shill a little bit O-Netics SE OPT.It is not an usual suspect when one considers SE OPT but I have to say that the quality of entry level 1 OPT -5k primary I'm using is superb.I ordered it .......

49: Re: Tone (5.11)
Posted by Mark (S-D) on 2001-05-29, 00:03:07 (209.240.221.68)
Hello Gordon, -- Take for instance running a 45 on DC or AC heaters. On AC the 45 has some of the best midrange possible. On DC the 45 has a little more guts but is way too dry. -- I should have wrot .......

50: "more dimensionality with idht's" (5.09)
Posted by njjohn on 2007-03-22, 15:49:35 (64.12.116.6)
That's probably a pretty on-target assessment. But let's not come to a final word about it since it is a work in progress to some extent. I think my most dimensional amps are the 6sn7/300bs. The 6sn7, .......

51: One size fits all (5.04)
Posted by paul_s on 2005-01-15, 14:35:46 (66.63.132.240)
I have always thought it was "better" to optimize for one tube OR another in most cases, and I can certainly rate different versions of even the same tube type in the same circuit according to how wel .......

52: Re: help me sort out the sounds (45, 2A3, 300B) (5.04)
Posted by Paul Joppa on 2007-03-23, 10:27:57 (24.18.240.124)
"Please -- anyone -- correct me if I'm wrong; but, the common wisdom seems to be: use the 45 if you can; if you can't, step up to the 300B." I guess that's true at the moment. Only a few years ago, it .......

53: Will Vincent 45 Amplifier (5.00)
Posted by Cleantimestream on 2013-02-20, 14:23:32 (24.209.24.10)
That amp Will makes is a push/pull 45 yielding about 10 watts OR about 12 watts @ 5% ... this is a class A/B circuit. I own one and still weighing in on the sound. One thing I can say right now, sl .......

54: Are you sure about a 45 in the WPA3.5? (5.00)
Posted by paul_s on 2004-02-28, 14:19:13 (66.63.129.148)
I really love my WPA3.5s with stock Sovtek outputs/RCA regulators, NOS Sylvania "tall bottle" 6SN7 drivers; 8 wpc and dead neutral. However, to my knowledge, this auto-biased circuit is driven rather .......

55: Re: Glory SE 45 mods? (5.00)
Posted by waveboxes@yahoo.com on 2005-11-21, 15:45:30 (24.99.31.31)
Got a NOS pair of Jan 6sl7 brown bottoms today. I also found 4)C4s boards (from an old Bottlehead project) Do you think that you could give any advice on installing them in this Glory 45 circuit...Th .......

56: 45 over 2A3 or 300B, 300B over 2A3 (4.93)
Posted by Gordon Rankin on 2001-08-17, 12:48:01 (216.68.180.35)
Gang, I posted my top 10 a while back. The 2A3 man it's a hard one to classify. There are just too many and none of them seem to have the same characteristics. There really is not much about needed po .......

57: Re: Bias??? (4.92)
Posted by Thorsten on 2002-01-03, 02:13:13 (195.107.47.228)
Hi, The "bias" is measured as Anodic current (see link to schematic). This means Tom is running jis 45's at 55mA and > 250V Anode Voltage. That is WAY, WAY above rated Anode Dissipation and quite fran .......

58: RE: 1619 to 45 adapter bummer (4.91)
Posted by Triode_Kingdom on 2018-05-26, 11:27:16 (63.246.183.22)
The bias requirements for a 1619 and a 45 are very different. With 250V on the plate and screen, the 1619 tube will conduct about 40mA with -10V on the grid. At 250V on the anode, the 45 will conduct .......

59: Re: Need help choosing a new 45 SET. (4.87)
Posted by Thorsten on 2005-07-23, 16:07:35 (82.35.154.114)
Hi, I know Gordon is again going to feel I'm busting his chops and is going to jump on this, but at least conceptually the closest alternatives to Gemini are Bottleheads 45 special Paraglow (output ir .......

60: Re: Interesting new 45 Set Amp/Kit (4.87)
Posted by gonefishin on 2003-11-28, 14:16:36 (12.242.211.102)
Hi How do you suppose this 45 amp may compare to other "easier 45 tube amp designs? Such as the bugle, the DRD...and some of the other 45 circuits you see on the net. The reason I ask, is because .......

61: Thanks - I'll start looking for a good 45 schematic!! (4.86)
Posted by Dave VH on 2002-06-01, 14:18:04 (63.194.80.83)
The amp is indeed simple inside. If I'm not sure of the value of a loose resistor, I can always use a VOM to check it, but that does not always work once they are soldered into a circuit. Can the same .......

62: Re: A 45 driving a 300B? (4.83)
Posted by smallpond on 2002-10-08, 18:21:47 (4.41.61.206)
Hi Paul Care to suggest any ideas for the additional stage needed for that gain? I would also like to know what kind of preamp/linestage would be a great compliment for a 45/300B amp. Would a circuit .......

63: A comparison of two 6sn7 circuits. (4.76)
Posted by njjohn on 2004-09-05, 08:43:52 (205.188.116.9)
I had an opportunity to compare two 6sn7 circuits. One is the srpp circuit and the other is a variant of the Fi primer circuit. I have them both as seperate pre's and I used the same amps in both comp .......

64: Not the tube. (4.76)
Posted by 01A on 2005-08-24, 21:38:32 (219.89.33.6)
You describe how DRD 300B sounds well. I have not heard the Wellborne amps, but have built a lot of my own amps including a really expensive mono DRD amps . I tweaked for months and gave up on the cir .......

65: Re: 211 (4.74)
Posted by Steven R. Rochlin on 2001-01-29, 17:00:31 (208.28.193.54)
Angel, >>>>Appreciated friends have carried out a circuit ONGAKU 211 all the valves 6072 and 5687 they are stabilized through power supply using MOS-FETS obtaining better results that the original cir .......

66: Comments and questions (4.70)
Posted by Scholl on 2000-07-11, 08:45:28 (192.135.193.34)
The amp you describe sounds like a single ended push pull. I'm thinking in terms of a grounded grid amp. I'm thinking with both ideas the driver tube will have to have the ratings to handle the peak c .......

67: RE: 1619 to 45 adapter bummer (4.70)
Posted by 6bq5 on 2018-05-30, 12:03:28 (67.218.104.82)
While I understand the desire to use a Tetrode or Pentode as a triode, to put that tetrode(1619) or pentode into the Triode's (45) CIRCUIT seems a bit silly to me. What does one hope to gain (no pun i .......

68: RE: James Burgess 45 build options (4.68)
Posted by GEO on 2010-11-18, 07:22:54 (63.117.228.138)
I have had several things built by James and I don't think I have seen him use a 12AX7 in any thing that he built for others or himself but I may be wrong. The Bugle circuit is a mixed bag. Most peopl .......

69: Sun Audio SV-2A3 with 45 tubes (4.65)
Posted by sergio_p on 2008-06-26, 04:42:09 (195.36.3.2)
Is it possible to use the 45 tubes on a Sun Audio SV-2A3? Does it require any circuit modification? Thanks .......

70: Any good DIY schematics for 10, 50, or 45? (4.63)
Posted by SEThead on 2008-12-05, 09:29:07 (98.209.218.108)
Hey all I've been reading these forums for a while and I'm very interested in SET sound. I'd like to make a SET amp with a simple circuit built around 10, 45, or 50 output tube. Anybody got any good i .......

71: Re: 10 vs. 45 (4.62)
Posted by Malcolm on 2000-07-28, 05:31:40 (206.175.232.4)
Tom, I'm currently building a DIY 10/VT-25 amp, using a Japanese (I think) circuit as a starting place, with an interstage tranny, no caps in the signal circuit. I have added all-DC filaments, with re .......

72: RE: Circuit design Vs. quality of the parts (4.62)
Posted by RON L on 2012-12-21, 08:08:50 (77.126.216.7)
What do you mean “simplest low stage topology, which IMHO, excludes three amplifying stages." SET base on 845 tube could be less amplifying stage then 801 or 45 SET? Shishido style has low amplifying .......

73: Single 45 Amp question and pics (4.62)
Posted by Les Hudson on 2007-03-01, 01:17:11 (72.128.205.180)
I built this Single 45 amp and it sounds great. I was measuring the plate voltage and it seems unusually low. I'm measuring 128v on the 6SN7 plate and 280V on the 45 plate. Is this right? Is there a w .......

74: Anyone Have The Schematic For Smoothplate's 45 SET From Valve Magazine (4.60)
Posted by Fullrun on 2004-08-17, 07:03:38 (68.36.46.10)
I'm looking for the schematic for Smoothplate's 45 SET that was in the back issues of Valve (Vol.4, #10, 1997). It seems now only avaialable from Bottlehead if you buy a $74.00 CD with 2 or 3 other vo .......

75: Swap a 2A3 for a 45? (4.60)
Posted by spkrman57 on 2004-09-28, 07:09:07 (131.64.9.116)
If running a 45 SET w/1.5k ohms cathode bias resistor, what will happen if a 2A3 were put in the same circuit? I am guessing the 2A3 would work okay, but with reduced output. Output tranny is 6K ohm p .......

76: You don't need the second half (4.58)
Posted by Frihed89 on 2014-10-28, 15:42:18 (62.135.226.50)
Look at the 6SF5 in the Schematic below of a direct coupled 6B4G monoblock. This same circuit type will, and does in practice, work well for the 45 tube, as well. See the discussion on AA at: http://w .......

77: SRPP or RC Coupled? (4.57)
Posted by sketti on 2009-08-06, 11:03:29 (70.239.199.4)
Guys, I'm thinking about having a 45 SET amp (w/volume control) built based on the JE Labs circuit and I'm pondering the two versions, SRPP or RC. Anyone out there have experience with these circuits .......

78: RE: What KIND of 2A3, ...or 45 ....for that matter ? (4.55)
Posted by Markhh2 on 2010-10-12, 13:18:20 (161.80.10.21)
And what circuit. Not to muddy the waters even further, but I heard a wonderful sounding push pull 45 the other day at Deja Vu. Just a bit more power and grip. Really nice. After hearing that next to .......

79: Re: Mod a LoftinWhite 2a3 to accept 45 tube (4.54)
Posted by David McGown on 2007-02-01, 17:01:08 (216.181.154.77)
You will need to switch in more resistance in the cathode of the output tube. The 45 operates with less current (35mA vs 50 to 60mA for the 2A3), so you will need to increase the resistance to get the .......

80: I heard Shuguang 2A3Cs in a Yamamoto A-08... (4.53)
Posted by JJ Triode on 2007-10-01, 11:18:51 (130.20.71.53)
...that is, running in a 45 circuit (usually no problem if the PT can supply the greater heater current draw, as Yamamoto says their amp can do.) We compared them to Cunningham 45s and Sovtek 2A3s. Al .......

81: Re: Other 45 SET Monoblocks (4.52)
Posted by Derick on 2003-01-30, 00:51:35 (203.167.26.185)
You already know of the X-perimenter Billies, and maybe the custom Bottlehead 45 kits. But there's also www.Tektron-Italia.com (c-core trafos.), they have an affordable 1.5W 45 stereo kit amp (point t .......

82: RE: Favorite DHT SET? (4.52)
Posted by njjohn on 2009-10-24, 05:54:39 (71.183.207.45)
I've said it a few times before. I've been listening to the 6sn7/26/45 for a couple/few years. Each time I turn it on, there is the sense of balance and it sounding right. I think there can be more d .......

83: RE: How to Determine if a 45 Amp Can Use a 2A3? (4.50)
Posted by Paul Joppa on 2010-06-08, 22:45:42 (24.19.48.62)
As others have said (below), there are two questions - can the power supply provide the necessary voltages and currents? and are the circuit values appropriate? The extra current for the filament is t .......

84: There is a switch to optimize for 2A3 or 45 (4.49)
Posted by Gordon Rankin on 2004-02-04, 09:55:00 (216.68.180.174)
Alan, There is a switch on the underneath side that converts the amplifier from 2A3 to 45. This changes the B+ and the BIAS point as well as the filament supply. Many times you will cook at 45 to a qu .......

85: Sophia Super 45/2A3 (4.49)
Posted by Gordon Rankin on 2003-03-27, 12:55:41 (66.161.186.92)
Gang, Randy was nice enough to stop over this afternoon with the new Sophia tube. It is the same as the Full Music 2A3. It's specs are the same as a 2A3 2.5V/2.5A's 800 rp...... I talked to Richard at .......

86: RE: If 50 is the New 40, than 46 is the New 45! (4.48)
Posted by Michael V on 2009-03-15, 23:19:48 (98.192.248.227)
Gerry, Thanks for your post. Putting aside the current rating, have you measured this amp's B+ voltages with the 46 in place? I'm afraid it is running very hard in this 45 circuit, without modificatio .......

87: My SET 2A3/45 Amp (4.47)
Posted by amandarae on 2008-04-12, 17:48:46 (71.104.53.243)
Hello, I am new to SET amp building and manage to build one from my friend's(Joseph Esmilla of JE Labs)circuit design. Here are some pics .......................................................... .......

88: RE: "This amp isn't as crystal clear as some others" (4.47)
Posted by Frihed89 on 2011-02-10, 06:41:04 (130.226.56.2)
I am not a DIY person. I like and own Audio Note amps. Circuit-wise, they are nothing fancy, but the quality of the parts and the implementation is incredible at each level they make. My ears and brai .......

89: James Burgess 45 build options (4.46)
Posted by wilsynet on 2010-11-17, 23:10:51 (24.5.11.149)
I've started talking to James Burgess about building a 45 based amplifier for me. There are a number of options for which I have little clue as to how to evaluate. 12AX7, 6SN7 or 5687 input tubes Mund .......

90: Beyond the 45? (4.45)
Posted by Gerry E. on 2010-04-04, 11:14:31 (72.200.162.41)
Maybe my title should have been "Beyond the 46?" because that's what I actually use. In either case, I am wondering if there is a triode output tube that can sound even better than the 45 or 46 (singl .......

91: RE: SET 45 (4.44)
Posted by Rick R on 2015-04-25, 22:27:15 (75.80.12.105)
Not being technically knowledgeable or talented enough to build a 45 amp, I cannot answer your questions regarding the subject of which design to use. But having owned nine different 45 amps from comm .......

92: Ah, now that's interesting... (4.44)
Posted by Deon G on 2002-01-07, 13:30:42 (195.232.62.46)
If that's so, it would make using the viac 45s really easy with the 2A3 ASL. I asked Joseph Lau the same question about using 45s on the Orchid, and he said "Should Adjust the bias and modify some res .......

93: Re: 46 vs 45 (4.41)
Posted by groverg on 2000-06-01, 19:52:43 (12.78.123.65)
The 46 has a lighter, sweeter, faster sound, as well as a more forward midrange and less apparent bass extension. The 45 is "cooler", more laid back, more even-handed. I've tried both as drivers in 30 .......

94: Actually that's the new Paramour II (4.40)
Posted by Doc B. on 2006-07-28, 09:47:09 (24.16.251.146)
The Paramour II comes with the parts to run 2A3s or (user supplied) 45s. The Paramount is supplied with parts to allow changing between a cap coupled 300B circuit and a direct coupled 2A3 circuit. Wit .......

95: Advice on getting a 45 built (4.37)
Posted by TAdams on 2014-12-16, 09:23:13 (50.65.164.49)
I've got 8 ohm single drivers and would also like to add 16 ohm Zu's to the party. Looking at an integrated Yamamato 08 (no S, AC heated before went to DC) or a Loften White circuit. Not really sure w .......

96: RE: It's that ole SET magic (4.34)
Posted by JANDG on 2008-08-05, 05:10:04 (4.178.186.58)
Andy Evans has a real world multitude of experience with DHT's, so definately clue in on that. The 10 is also the best tube I have ever heard & by a fairly large margin. If you have access to these & .......

97: Re: Ah, the slippery slope... (4.32)
Posted by Dave-A on 2006-08-25, 12:47:08 (216.83.156.226)
of more power through PP. That will compromise the sound as well. PP just seems to do that. Sure you gain power, but you lose delicacy, dimensionality and some of that living quality that make SET so .......

98: RE: Too many possibilities? (4.32)
Posted by Salectric on 2009-12-08, 11:20:14 (70.91.92.17)
Are you saying that your "cost no object" 45 amp used Gordon's Bugle circuit? If so, that's quite an endorsement. What type of OPT did Burgess use? .......

99: RE: Agree! (4.29)
Posted by lugnut1 on 2016-02-02, 09:11:47 (70.114.246.103)
I have a lot of respect for the EL84 as you say TK. That might just do it with a little more power than the 45. Have you tried or heard the ZEN circuit with a 6922 driver? .......

100: RE: Listening to my New Korneff Clone 45 SET Amps ................. (4.29)
Posted by Cut-Throat on 2021-03-29, 10:10:55 (107.2.79.94)
I tried the Emission Labs '45' Tubes quite awhile back, and they hummed like crazy in my very sensitive speakers. The emission labs tubes are a higher power tube. In fact some people say that they are .......

101: Re: Ah, now that's interesting... (4.28)
Posted by Thorsten on 2002-01-08, 02:45:37 (195.107.47.212)
Hi, > I asked Joseph Lau the same question about using 45s on the Orchid, > and he said "Should Adjust the bias and modify some resistor of > bias circuit". I looked only at the Tulip and thought ther .......

102: Re: First impressions: TU-872 ($500 2A3 SET from EK Japan) (4.27)
Posted by Byzen on 2000-04-18, 10:57:46 (206.171.134.229)
Francis - Try converting the amp to 45 triode instead of the 2A3s by changing the plate resistor to 1.5K ohm and taking out the NFB circuit which is explained in the instructions. I also use the Sylv .......

103: RE: Look here (4.25)
Posted by wilsynet on 2010-11-18, 09:38:39 (74.121.22.10)
I recall now. I did actually ask him about the "Blue 45" which is very handsome, but it is a high gain unit he said, more than the Bugle circuit. I'll try to get on the phone with him today and tomorr .......

104: RE: Venturing into SET active system. Does a 45 have enough power? (4.25)
Posted by megasat16 on 2016-08-26, 11:52:29 (173.51.68.193)
"12 ohm 104dB/W driver should be better for dynamics than an 8ohm 104dB/W driver. Right?" Nothing sets in stone here! Depends on your speaker's true impedance curve, the amplifier circuit, transformer .......

105: Cause it sounds GOOD! (4.23)
Posted by Ivan303 on 2003-04-21, 17:39:55 (12.81.164.82)
And, Has enough power to drive "Real" speakers, and is available at a reasonable cost, and most importantly it SOUNDS GOOD. Clearly one of the BEST SOUNDING amps I have EVER heard had one of those che .......

106: Hammond vs Magnequest (4.23)
Posted by scottj@bellsouth.net on 2011-05-01, 11:34:29 (50.80.91.24)
What are the pros and cons between these two for use in a 45 set amplifier ? Noise, hum, circuit ? Excuse me but I am a newbie at this. Thx. .......

107: Re: Tektron 45-based amp - opinions? (4.18)
Posted by Robert H. on 2002-01-21, 13:55:35 (216.191.148.170)
Yes, I have one, the integrated 45 based amp. Mine is far from stock, it has special hand wound C-core transformers which the stock kit doesn't have, and I upgraded the stock caps - BG's in the PS, Vi .......

108: Re: Best 2A3 & 45 amp designs? (4.15)
Posted by reverendclark on 2001-01-16, 21:30:07 (63.224.146.17)
FWIW, I have a pair of 45 Loftin-Whites with big honkin' 100w P-P OPTs that are far and away the best I've heard, including all the 2A3s I've owned and heard. It may be the OPTs, it's a comparatively .......

109: Re: Yamamoto A08(S) 2A3 kit (4.13)
Posted by sganti on 2006-12-26, 17:48:17 (204.50.113.28)
Hi I just build the A-08S 45 Kit. It is stunning!! I had built a 811A amp Shishido San style, but once I finished the 45 Amp, I took my 811A amp into the garage.. The sonics are great, the bass is unb .......

110: RE: Why are there no parallel 2A3 and 45 SETs? (4.13)
Posted by GTCharlie on 2008-09-04, 19:27:02 (203.177.74.136)
Yap. Tubes deteriorate differently, even in the same circuit. If you really WANT parallel ... maybe a fine tuning pot at the cathode? .......

111: Re: Do not be too quick to condemn the king of DHT's, the 300B (4.12)
Posted by Mark (S-D) on 2001-05-31, 00:05:43 (209.240.222.32)
-- The 300B is still the King of direct heated tubes IMHO.Do you have experience with any of these triodes? -- I have heard the 300B, but in a valve-state type circuit. The sound was not too good unti .......

112: RE: My SET 2A3/45 Amp (4.12)
Posted by JANDG on 2008-04-13, 15:57:40 (4.178.186.184)
I also built Joseph's 45. Itr is my favorite amp of all & have never felt a need to update it or build another 2a3/45. I also used James 6123's, brother to your James OT's. Which I find wonderfull sou .......

113: Ongaku circuit wrong ? (4.11)
Posted by leneliquid on 2004-07-10, 10:26:08 (80.189.42.63)
I have built a pair of mono blocked Onkaku 211 amps based on the circuit diagram from SP. Does anyone know if it has errors because mine don't work. This may be down to an error in building though! B .......

114: Re: SET Power Tubes and Music Preferences (4.11)
Posted by SETdude on 2005-08-21, 17:16:49 (12.77.212.124)
*some types of music sound better on different amps, but probably has as much to do with topology/circuit, speakers, etc. as the tube type. All contribute to the sound pretty equally, imho.* I agree w .......

115: RE: James Burgess 45 build options (4.10)
Posted by Frihed89 on 2010-11-19, 01:53:11 (130.226.56.2)
If the input in this circuit influences the sound, won't one notice some sonic differences from these 2 tubes? I don't know the answer. Is it an SRPP? .......

116: Yes, slightly modded Welbornes (4.10)
Posted by 4season on 2008-08-06, 16:47:47 (204.131.179.187)
My Star Chief 45 is almost entirely stock but I removed the 1 uf bypass cap on the ultrapath oil cap and fussed with the mechanicals a little, in order to reduce mechanical ringing of the 45 tube. I'l .......

117: RE: Stereomour vs other 2a3/45 designs? (4.09)
Posted by Frank Mena on 2020-06-11, 14:27:58 (76.64.96.40)
Could the question be changed to Parallel Feed (parafeed) vs Series Feed output for SET amps? and are you asking about circuit design or sound quality/traits or cost? .... not sure what you are after .......

118: Re: Did I kill my tubes? (4.09)
Posted by xcortes on 2006-08-15, 20:40:23 (201.133.104.179)
I can't tell visually if the tubes are damaged but I did another review of the circuit and everything looks in place. Will look for a cheap 45 tube to try it before risking another expensive NOS pair, .......

119: Re: Cool little amp!... (4.08)
Posted by Les Hudson on 2006-09-06, 08:58:17 (68.248.238.60)
Yes, I routered MDF on the sides and painted Vintage Marantz Hammertone. This amp is very heavy and it makes nice handles on the sides. When I first built this amp it was a Push Pull 626. I used the .......

120: Re: 45 supply (4.08)
Posted by Gary P on 2001-07-24, 11:54:16 (192.65.40.9)
One reason that the 45 or any other no feedback SE amp sounds like it has more bass than a low output Z SS amp is the high output Z changes the speaker alingment. Adding the 4-8 ohms output Z that SE .......

121: Re: 10 vs. 45! (4.08)
Posted by Quest on 2000-07-26, 14:05:53 (207.34.146.24)
Hi Tom, As your venture down the microWatt class system-matching becomes more critical than ever. Many low-ish sensitivity with huge impedance swing over it's reproduceable freq. will never work in th .......

122: Some more questions (4.07)
Posted by Yada on 2010-04-12, 20:32:57 (173.57.91.172)
Sorry for the basic questions, but are you saying that if the amp is built as per the schematic/spec, that any 45 should run - but that if it happens to be setup for 50 mills that the tube will sound .......

123: RE: If 50 is the New 40, than 46 is the New 45! (4.06)
Posted by Michael V on 2009-03-16, 21:36:21 (71.178.141.65)
Very understandable - in this particular circuit the 46 probably has closer to 300 volts on its plate, which is well above the 250v maximum. IMO, it's probably worth checking. .......

124: RE: FYI: Mr. Korneff is operational (4.05)
Posted by tubtub on 2009-07-21, 03:35:12 (205.174.8.4)
I have a couple of Burgess 45 amps and love them very much. Can I ask which driver tubes and what kind of circuit does James Burgess use on your amp. Thanks. .......

125: RE: SE 801A Amp (4.05)
Posted by Frihed89 on 2015-06-17, 22:33:14 (62.44.135.244)
As far as i can tell, this circuit is the basis for the Fi 2A3 and 45 monos, and maybe one other that gets a lot of attention. Don't be fooled by its age and simplicity. (I know nothing about the 801A .......

126: Re: can I put 45 tube in AES SE1 ??? nt (4.05)
Posted by Darryl on 2003-01-26, 07:37:30 (172.136.252.219)
According to my instruction manual for the SE-1 (the original SE-1, not the Signature): When using a 45 tube, a 1 ohm 5 watt resistor must be put in series with the existing 0.75 ohm 25 watt resistor .......

127: I'm I going to regret this? My 2A3-45 struggle. (4.04)
Posted by bmed on 2004-01-30, 09:22:16 (170.27.132.37)
I've been powering my Abby's with a PP KT88 amp as well as borrowing a friends 2A3 Moondog for intermittent listening sessions. I really like the the synergy with the SET vs the PP design with these s .......

128: Interesting new 45 Set Amp/Kit (4.03)
Posted by Kuei Yang Wang on 2003-11-28, 04:00:35 (62.6.139.12)
Konnichiwa, I occasionally look around on japanese websites and I noticed this little Amp: Looks good, seems nicely made and it is available in both Kit Form (138,000 Yen around $ 1,300) and as Fini .......

129: opt for pp2A3 and pp45? (4.03)
Posted by gonefishin on 2002-05-11, 21:26:14 (12.251.50.145)
Hi Kurt. I seen your PP45 amp...nice! I actually have a question regarding a pp2A3 amp. Can you run a pp amp with either the 2A3 or the 45 tube? What would be the optimum impedance and whether it co .......

130: that answer wasn't even close (4.03)
Posted by Sector-7G on 2003-09-14, 10:33:03 (130.203.168.149)
though if the 80 mA 45's are never going to be sold it is a moot point. Again, what is the difference between them and the newer ones with regards to plate z, gm and mu? are they better than what is r .......

131: Have SET fever, need diagram (4.03)
Posted by zaxxon on 2004-08-11, 12:45:42 (195.159.177.27)
Hello everybody. After listening to a SET + horn setup earlier this summer I must say I'v got an extreme SET fever. I havn't decided if i should buy a kit or build one from scratch based on a circuit .......

132: Autoformer or Resistor pot volume control for SET amps? (4.02)
Posted by GBLPS on 2013-12-15, 13:08:55 (208.123.181.194)
I have 3 different SET amps Korneff 45 Will Vincent 2A3 Radiotron circuit switchable to 45 and a Tube Audio Lab JEL Deluxe 2A3. My speakers are 101 and 98 db efficient. I have two George Wright phono .......

133: I doubt it !!! (4.02)
Posted by drlowmu on 2008-11-02, 14:02:03 (76.0.20.186)
Facts are, the filament current of the 2A3 is greater, the current draw of the 2A3 is twice that of a Type 45. Without specific circuit changes for the 2A3, it is certainly NOT a direct replacement of .......

134: RE: push pull cancels 2nd order distortion so you will lose that fat warm sound of set, my push/pull 45... (4.01)
Posted by Tre' on 2014-08-07, 08:21:07 (76.90.38.219)
"Norman Crowhurst in the 50's validated through his groundbreaking research that several instruments derive their distinctive beautiful sound WITH and THROUGH 2nd order distortion...." Instruments? Se .......

135: Sovtek 2A3 vs. 45's (4.00)
Posted by Kurt Strain on 2000-06-07, 18:40:20 (209.204.136.84)
Both of these are single plate triodes, both can run at 270V and 36 mA and 2.5V filament voltage (2A3 needs more current for the filament). I listened to the Sovtek 2A3 in my 45 parafeed amp and it wa .......

136: Re: 45 SET Amps or Amp Kits? (4.00)
Posted by Gary Kaufman on 2001-06-23, 17:54:55 (65.96.204.89)
I've built the "Simple 45/2A3" on Angela's site and was very pleased. Pictures of the amplifier and link are on my webpage. It is very nice sounding and straight-forward to construct. It is not a kit, .......

137: Not quiet.... (4.00)
Posted by Kuei Yang Wang - The real one on 2004-09-17, 09:32:59 (62.6.139.12)
Konnichiwa, Most 2A3 Amplifiers can be misappropriated for use with 45's though. You need to adjust the Circuit to run around halve the current through the output Valve, with most other values similar .......

138: Re: O.K. SetDude, the Jupiters arrived!! (3.99)
Posted by SETdude on 2003-01-23, 11:23:52 (65.198.222.78)
Hi Ken, I find them to be smooth and extended. I have them in my pre and 45 amp and in my 300B's use them and AN silvers. Circuit and 'taste' determines what we think sounds good. Les .......

139: Not an amp to begin with but... (3.99)
Posted by njjohn on 2005-01-28, 21:46:22 (152.163.100.7)
You are on the right track with building a 45 to begin with. And the fact that being new at it and preferring something simple may be an asset to begin with if simplicity is a key. I have some clear p .......

140: Re: BTW (3.99)
Posted by GEO on 2004-09-06, 08:01:03 (67.86.160.114)
Of all these things the only thing that has not been really explored is the use of the Webster push pull transformers in a single ended application. Everyone that I know that builds or is really into .......

141: Re: Which SET amps are you running... (3.98)
Posted by neilium on 2000-04-05, 22:19:45 (64.24.57.133)
Hi, Home-made 45 amp (JE Labs "Simple 45/2A3 amp for first time DIYers") cap-coupled, 1/2 6SL7 driver, silver wire, cheap Hammond universal OPTs. My speaks are Goodmans Axiom 201s in sealed cabs. The .......

142: RE: What kind of a SET can be used with Altec Model 19s? (3.97)
Posted by SBB on 2008-09-27, 06:59:19 (72.218.237.71)
Plinko, I've swapped between a Korneff 45 and a custom 845 for years with my Model 19's. Provided your room isn't huge and you don't listen to rock or orchestra at ear bleeding levels, a 45 will work .......

143: Re: Jeff Korneff 45 amps (3.97)
Posted by tubeaholic on 2001-01-31, 12:31:43 (12.26.184.110)
Jeff's circuit it is based on Eric's but there are some slight deviations. Unfortunately I don't know the details. I'll see if I can't find out what the "deviations" are from Jeff. .......

144: RE: After a few years of 2A3 - Craving a 45 tube amp...or even a 300b (3.96)
Posted by restock on 2008-10-28, 00:29:13 (99.232.92.145)
Paul, very interesting comment and observations. The Fi is wired for 8 Ohms - I could rewire it ;), on the Verdier 45 I used the 8 Ohm tap. I may try to borrow the Verdier 45 again and try the 4 Ohm t .......

145: Re: circuit, room, budget, type of music... (3.96)
Posted by HiFiOd on 2006-08-23, 09:07:50 (66.50.212.79)
The circuit, the driver tube, and the OT will have a great effect on the sound beyond the output tube. I have an ST70, a Fi 300b monos and a Fi Xmg that can drive 2A3s or 45s, and I do have a pair of .......

146: RE: Advice on getting a 45 built (3.95)
Posted by TAdams on 2014-12-17, 07:20:07 (50.65.164.49)
Thanks for the input Gents I really appreciate it. Hifi Paul: I agree I should do some auditioning. I live in Edmonton Canada. Any SET heads around here? Perhaps I should do a separate post inquiring. .......

147: Re: 2a3 vs 45 vs 300b (3.94)
Posted by keto on 2004-09-16, 08:18:25 (148.240.220.101)
Could you modify to a direct-coupled 2A3? I've found that a great circuit sounds stunning with even the least-expensive 2A3's... --keto .......

148: Re: know of any good 45pp? (3.92)
Posted by Kuei Yang Wang on 2004-05-27, 05:18:01 (62.6.139.12)
Konnichiwa, > know of any good 45pp? That one can actually buy somewhere? Not really. You could have the DIYHFS Juoplin assembled and set up for 45's (it can be set up for 45, 2A3 or 300B). My own Amp .......

149: RE: James Burgess 45 build options (3.92)
Posted by wilsynet on 2010-11-23, 08:07:13 (74.121.22.10)
Thank you all for your input. Still have some things to think about, and unfortunately, it isn't at all clear what all the options are and what they all do. I wish I could go to James and say "this is .......

150: RE: Any good DIY schematics for 10, 50, or 45? (3.91)
Posted by mg16 on 2008-12-06, 09:32:14 (24.154.78.136)
Hi, I found the Single Ended Glory 45 amp circuit very musically satisfying. Published in the 90's in Audio Amatuer magazine by Eric Barbour. Cheap, easy to build, and sounds wonderfull with 94 db and .......

151: Re: you may want to try (3.90)
Posted by fred76 on 2005-09-25, 07:26:24 (202.175.254.122)
Hi Brian, When you included the link below re: 2A3 comparo (A-08S)... It says this: "Action situation of output tube 45: the substance plate voltage: 276V, 34mA, load impedance 5k ohms" The operating .......

152: Sounds of numbers crunching . . . (3.89)
Posted by Poindexter on 2007-01-22, 19:09:41 (72.234.139.119)
I have a variation of the Machine circuit that I was planning on using for 2A3s, it's certainly directly applicable to 45s, but there are some little snags.  The 45 has twice the plate resistance .......

153: RE: How Long do Caps last in a 45 SET Amp................. (3.87)
Posted by drlowmu on 2015-05-30, 20:13:12 (71.50.29.73)
You probably need to leave it alone !!! Best procedure would be some test equipment to check each cap in the circuit. ( There were ESR meters, for in-circuit testing, two decades ago, likely still to .......

154: your amps. (3.87)
Posted by njjohn on 2007-01-16, 15:26:15 (152.163.101.6)
Hi Randy, If you have a fi primer 6sn7/26/300b, that is the only one of its kind. All the other 6sn7/26/300b's that I know of have the 6sn7 on seperate chasses and they are either a srpp circuit or a .......

155: Re: Hammond 125ese findings and a good budget circuit (3.87)
Posted by Vinnie on 2001-04-29, 09:28:58 (12.107.226.22)
These should also work quite well with the "simple 2A3/45" on Angela's site and Gordon Rankin's "Bugle". I built both using the old 125e and they worked great. I would expect the 125ese would only imp .......

156: Re: 45 amp with 6J5 input tube. (3.87)
Posted by big muck on 2001-06-22, 12:26:48 (66.1.166.57)
A great combination I would think.I built the Ultrapath linestage a couple of years ago using the 6J5GT and its a wonderful tube in that circuit.My favorites are the Raytheon,Kenrad and RCA.They are s .......

157: RE: Interesting (3.87)
Posted by PakProtector on 2017-05-28, 04:03:11 (23.125.73.217)
This assumes that it is actually a real effect. So far the 'current hog' stories have not quite been what I'd call air tight. For the usual A1 cap coupling, the grid circuit gets to be a significant .......

158: Re: 6v6 driving 6v6 amplifier problem (3.86)
Posted by FM on 2001-02-26, 12:02:31 (167.176.6.8)
Hey Kurt.It is not a follower stage.It is a 2 stage RC coupled amp.I don't have scope to measure anything(wish I did).There is another post that mentions that there must be a resistive load on the pla .......

159: Re: Now that youre hear (3.85)
Posted by Jim Hodgson on 2007-03-17, 00:49:12 (68.174.188.180)
I want to chime in, here, and agree entirely with the "how different ... depends" comment. My "45" is Jeff Korneff's. I've tried at least a dozen different "brands" of N.O.S. 45s -- although I've alwa .......

160: RE: James Burgess 45 build options (3.83)
Posted by wilsynet on 2010-11-18, 13:51:59 (74.121.22.10)
makarushka, Aside from the heavy aluminum powder coated chassis, were there any other exotic parts that you've chosen, in particular caps, resistors, power supplies? Or were they pretty much basic uni .......

161: RE: Full Monkey amps (3.83)
Posted by Thorsten on 2010-11-14, 07:41:23 (109.169.26.3)
Hi, A 300B "Monkey" is not a big deal, a 211 and 6S33 one can also be done. I'd not try an 845 one, unless running the 845 at low voltage. The reason there are few "Monkeys" other than 2A3 or 45 out t .......

162: Re: There Is Nothing Like 45s....Here's My PP45's (3.81)
Posted by drummerwill on 2005-05-27, 08:47:58 (65.69.54.243)
These are Wurlitzer Jukebox amps I have worked on for about 5 yrs since I got the first one. Since I have replaced the voltage dividers, gone from Solens in the P.S. in the original rebuild to moder .......

163: Re: Are SET's inherently 'noisy'? - from a newbie (3.81)
Posted by elektron on 2005-04-01, 09:10:48 (148.78.243.24)
Scorpio, hi. Not inherently noisy. I have home brew 2A3 and 45 SET amps among others that are very very quiet. The 2A3 has a little more self noise as it has two tube stages before final, but you have .......

164: RE: Are you using them? (3.80)
Posted by JJ Triode on 2008-04-10, 11:50:47 (130.20.71.103)
Thanks, Donald. I agree that "refined" is a good word to associate with these tubes. They also sound excellent in a 45 circuit, as several people have noted. In fact the ONLY downside to the Shuguang .......

165: Re: Is "44ma-46ma" a good reading for a standard 45 tube? Please help! (3.80)
Posted by Paul Joppa on 2006-10-15, 12:19:12 (24.18.240.124)
I don't know the Korneff circuit - you should of course ask them. But in general, the 45 was never specified to operate at more than 36mA current. A high current will deplete the space charge, putting .......

166: Re: Midrange tone of 71A, 45, and 300B (3.79)
Posted by DrM on 2001-05-28, 10:33:40 (208.201.224.36)
Hi Mark, My buddy Kurt and I will be able to compare the 71A vs the 45, in similiar circuits (parafeed with similiar components.) I'm waiting for iron (Magnequest EXO-145) for my 71A, should be here i .......

167: RE: 300B suitable for WPA 3.5 (instead of the standard 2A3)? (3.79)
Posted by dvb on 2013-03-07, 14:25:22 (96.49.137.84)
I have heard of the WPA3.5 monoblocks being used with both 300B and 45 tubes - but in each case some minor mods of the circuit were recommended. I'm afraid I don't recall what the mods were, just off .......

168: Re: 2A3 to 45 conversion (3.78)
Posted by Paul Joppa on 2005-12-17, 12:48:43 (24.18.240.124)
What it takes is engineering, albeit pretty elementary engineering. You'll have to either ask the engineer who designed it, or provide a circuit so the "engineers" (DIYers!) here might have a shot at .......

169: Re: AES SE-845 !!! (3.78)
Posted by Paul Barker on 2001-01-31, 19:06:26 (195.92.168.164)
Ah, now you really are asking. The circuit my friend built is on the VT52 Website, i think it's a Japanese guy. The circuit requires all obsolete valves. Two Osram ML4's (which are listed as obsolete .......

170: RE: Actually..... (3.76)
Posted by D Mike on 2011-02-15, 12:26:44 (68.72.228.34)
Which circuit version do you have? The one you posted is not the same as the one linked to the Angela site. Do you use two 6SL7's or one? My simple 45 uses one 6SL7. I added CCS and LED bias on the dr .......

171: Working backwards: SET to match transformers (3.75)
Posted by john dem on 2001-07-20, 22:56:02 (203.164.2.198)
Hello all, I have some 4k output transformers (Neptune brand) from an old EL84 amp. Any ideas for a circuit to use these in a SET amp ? Maybe a 45 SE ? Regards, john .......

172: LOL (3.74)
Posted by drlowmu on 2016-10-12, 09:43:10 (71.50.24.205)
Yes, it was a DIY amp, and ( IMHO ) I likely build one of the best designed ( and executed ) supplies ever done in the entire history of SET audio !! It IS the ST or Globe 45 tube, a broad midrange su .......

173: RE: This is the cheapest I've seen.. (3.73)
Posted by mikeval on 2012-06-03, 13:56:32 (66.87.0.163)
Don Garbier ? !! I think Don would enjoy that, seeing how he is looking for a place in the south of France.(to share with Juliette Binoche, I hear). And no need to worry about that 6SH5 driver,(you mu .......

174: Re: Best 300b SET monoblocks...................... (3.73)
Posted by single_ended on 2002-11-16, 21:51:44 (12.80.6.157)
I built the following 300B amps - these are the best amps that I have built so far (including 45 parallel feed with cobalt (almost the same), WE275A nickel output, 10 etc). It just sounds more "live" .......

175: Re: A comparison of two 6sn7 circuits. (3.73)
Posted by njjohn on 2004-09-05, 09:22:21 (205.188.116.9)
The one I sent you is the srpp. It was the day after than a seperate fi primer was completed. I have 4 srpp pre's and only one fi primer pre. What happened was that John's original amps were fi primer .......

176: RE: 300bs at 300volts (3.73)
Posted by RC Daniel on 2012-05-09, 04:34:54 (58.165.111.233)
I have had a few drinks, but the original WE datasheets show ~ max dissipation at ~ 28W, with recommended dissipation at ~ 18 W (or slightly less) People's opinions on ideal operating points vary. and .......

177: RE: James Burgess 45 build options (3.71)
Posted by makarushka on 2010-11-18, 12:37:32 (63.82.98.2)
I've owned -- and still do -- a number of pieces of gear made by James, and hold it in the highest regard. I've been able to not only compare his equipment to a number of others but also sometimes to .......

178: RE: After a few years of 2A3 - Craving a 45 tube amp...or even a 300b (3.70)
Posted by Paul Joppa on 2008-10-28, 00:02:25 (76.22.120.252)
Do you know the output transformer primary impedance on the amps you are using? Especially the Fi and the Verdier? I ask because, while the 45 can run happily into the same impedance as a 2A3, it will .......

179: Re: Mod a LoftinWhite 2a3 to accept 45 tube (3.67)
Posted by twl168 on 2007-02-01, 21:51:15 (69.234.105.3)
Thanks. I will try to find a circuit diagram of loftin white and post the link. The thing aboout my amp is that it had been modified by previous owner to direct couple. I was told that other than that .......

180: RE: First SET amp experiences (3.67)
Posted by njjohn on 2007-10-19, 08:52:39 (151.198.194.85)
With somewhat limited experimentation, I find a fi primer 6sn7/26/45 to not only the best that I have found, but to continually provide the right sound. But amps like this only continue to improve. I .......

181: My only recourse (3.65)
Posted by jellobrain on 2001-01-21, 17:12:30 (208.35.226.7)
All those measurments were made with the tube in. AND yes the tube IS bad, or at least NOW it is! Once I realized that(the tube was bad(now the grid will not light up AT ALL)) I put in ANOTHER 45, ok .......

182: Re: AC heating 45 SET..with 106dB horn? (3.65)
Posted by C.Y on 2002-12-15, 17:41:48 (61.83.36.40)
Hi What I am afraid is the hum, I know AC heating is better than the regulated (say 7805 reg. for 300B) DC. Battery is something I am dreaming of due to the practical usage e.g charging and the compli .......

183: RE: JC Morrison 3.5 Micro Circuit: Opinions? (3.65)
Posted by Vinnie on 2008-01-28, 14:45:14 (71.70.154.214)
I remember that thread! That was back before I morphed into Vinnie, when I was building the 3.5. I think it was my second diy amp, right after JE labs simple 45/2A3. It is a great little amp. Even wit .......

184: Sure (3.65)
Posted by SET collector on 2011-12-31, 15:47:21 (50.50.171.79)
I would agree. I never mentioned that differant tube types do not have a sonic signature. To that you would also have to add the sound qualities of other tube types used in amplifier and again the dif .......

185: Re: help me sort out the sounds (45, 2A3, 300B) (3.65)
Posted by Rick C on 2007-03-22, 14:56:05 (128.115.27.10)
Dear Jeffery, Since you seem to want to hear a 45 amp, your best bet is to get in touch with Don Garber. I believe Don lives in Brooklyn. In my experience, a 45 amp probably will not solve your bass .......

186: RE: SET 45 (3.63)
Posted by drlowmu on 2015-04-25, 16:22:02 (71.50.27.251)
For best performance, do a simple circuit. That means two stage and eliminate the cap couple. That means a Morrison Micro, adapted to the Type 45 tube. There are several of things you can do to .......

187: RE: But here's a commercial preamp kit that uses your favorite tube (3.63)
Posted by andy evans on 2014-10-29, 03:55:14 (92.2.65.104)
Any comments? Well, I don't have the circuit to hand. Anything with the 4P1L will be a good idea. The best way to use it is in filament bias and with a really good interstage or OPT, so that takes my .......

188: RE: Korneff amp - 5u4 to 83 adapter (3.62)
Posted by Paul Joppa on 2011-10-23, 20:29:26 (24.19.48.62)
I don't have the Korneff circuit, but a mercury vapor tube would likely increase the high voltage. There is a risk to the longevity of the 45 in that case. I'm just sayin' ... it's like the worlds bes .......

189: Re: 10y as an output tube (3.62)
Posted by tcain on 2004-06-14, 09:30:28 (66.97.92.128)
Using 10y in a parafeed preamp driving 10y or 801 amp driving 45's presently. I would say "how" they are being used and in *what* circuit would matter as much as tube selection. 10y is champagne for .......

190: RE: Korneff 45 & Kalinowski 206-ESR Imaging issue - HELP! (3.60)
Posted by BR on 2010-05-15, 07:21:45 (75.40.236.122)
You may want to add a Hammond choke to your system on the same circuit as the amp. If you do a search you can find the information on how to buy and wire the choke. In my system the choke(s) improved .......

191: RE: If 50 is the New 40, than 46 is the New 45! (3.60)
Posted by Gerry E. on 2009-03-16, 08:14:08 (67.87.234.213)
"Putting aside the current rating, have you measured this amp's B+ voltages with the 46 in place? I'm afraid it is running very hard in this 45 circuit, without modification." Hey Michael: I don't k .......

192: RE: The Korneff 45 was an audio-life changing event for me. (3.60)
Posted by Cut-Throat on 2021-03-28, 06:27:56 (107.2.79.94)
Yes, we were considering moving to Florida in the next few years, but this trip has changed my mind. We used to winter in Florida about 7 years ago, and the change since then is dramatic... Housing pr .......

193: RE: Newbie question about SETs (3.59)
Posted by 4season on 2009-06-04, 16:43:31 (204.131.179.187)
I've only built/owned 300b and 45 amplifiers. The 300b is a really nice all 'round tube, because it's relatively common, in current production, and typically puts out 7-8 watts which can go a surprisi .......

194: Re: Gordon Rankin: "2a3's..what a waste of time"...So what you're really saying is... (3.58)
Posted by lovetube on 2007-03-03, 19:13:16 (220.239.96.208)
Hi Paul. is your one the same circuit as Les he posted below ? http://gallery.AudioAsylum.com/cgi/gi.mpl?u=33876&f=se_glorya.jpg it also use half of the 6SN7 driver the 45 and I think it can driver th .......

195: Re: Anyone? (3.58)
Posted by Gary P on 2001-08-30, 15:24:55 (192.65.40.9)
This idea should work good to create a great performing amp on the cheap. With the need for parafeeding the RS transformer we need a cheap plate load to keep in the spirit of things. Voltseconds exten .......

196: In my direct-coupled 45 amp....some observations (3.55)
Posted by coronadope on 2017-03-03, 17:42:30 (208.54.90.190)
The direct couple run from the 7B4 to the 45 sounds more detailed with a single run of .22 gauge silver than it did with the same wire paralleled with two TCSS. On the 45's filament going from three p .......

197: Re: Mesh 45s (3.52)
Posted by Bob.Obo on 2000-06-12, 22:18:10 (209.87.132.143)
Ever since you beat me out of those Marathons, by a narrow $400 (!) I have been meaning to ask... are the meshplates significantly better? As I am completing my EC8020 direct couple to RE 604 parafeed .......

198: Re: $650 with that auto painting finish? with the driver? (3.51)
Posted by Cam on 2001-04-25, 21:04:00 (64.168.92.5)
Looks like maybe a PM6C in a TWQT with a reflex port? If they are PM6C's, they are list $490/pr alone. Amazing; the cost of drivers in typical commercial loudspeakers is less than of the system. This .......

199: Re: Iron used in Jeff Korneff 45 amps (3.51)
Posted by tubeaholic on 2001-02-01, 00:07:26 (207.172.11.148)
I was too hasty in my earlier post about the iron. I talked with Jeff. He is now firmly in the new SE OT camp, including Magnequest, Lundahl, Plitron and Electroprint. Evidently he had a pair of Sansu .......

200: RE: Cap Value Reduction/Upgrade (3.51)
Posted by Sr5 on 2009-04-24, 10:25:33 (68.166.94.234)
I changed from a .22Mf. It really depends on what you want to settle on the low cutoff frequency. I changed to lower because of a resonance problem in the circuit. The further I look into this, the mo .......

Found 63 records in Tweakers' Asylum.

1: Re: 45.158 MHz Clock generator (8.19)
Posted by Elso Kwak on 2001-08-28, 04:31:03 (195.85.130.112)
Hi Scorpio, The 45 Mhz oscillator is used for Sony's bitstream converter like the CXD 2552Q and the like. If you use your CDP as a transport (external DAC) you can forget about the 45 MHz clock and us .......

2: See Horowitz and Hill, page 45 and following. (8.19)
Posted by Al Sekela on 2004-06-17, 21:59:58 (66.120.161.124)
You continue to confuse filter design for ripple suppression with the circuit design treatment of the power rail. Even a well-designed differential amplifier has some mismatch in its components and wi .......

3: 330 vs 430 (7.39)
Posted by djk on 2001-06-03, 02:14:04 (206.24.61.226)
The HK 330C and the 430 had exactly the same design.The circuit board would accept either metal or plastic outputs.The 430 had metal the 330 plastic.On the 430 the parts for the FM muting were install .......

4: Buy a cheap pair of wire strippers. (7.17)
Posted by jea48 on 2006-06-21, 18:11:22 (71.214.202.223)
Go to HD and buy a pair of wire strippers, check out my link below. On the strippers you will see notches, holes, for #12awg and #14awg. (Ideal 45-120 for solid wire) or equal. First make sure the cir .......