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1: High Efficiency Speaker Asylum, LMAO (0.00)
Posted by Dr Deville on 2007-03-19, 17:43:39 (71.226.115.228)
Sublimation at its best? If you put your finger on it, you'll probably hear a moaning sound... .......
2: SET Asylum, Thanks SnL, Informative and Fun Review. Have Fun! (nt) (0.00)
Posted by Dr Deville on 2007-03-17, 16:18:46 (71.226.115.228)
I enjoy reviews like yours. .......
3: SET Asylum, Enlightened Self-Interest (0.00)
Posted by Dr Deville on 2007-03-15, 14:51:14 (71.226.115.228)
Thanks DM, As a customer currently waiting, I'm grateful that you took the time to post. It's the unhappy who are most likely to post, so, though that's all part of it, I am appreciative to those who .......
4: SET Asylum, Did You Search Before Posting? (nt) Re: Trouble with Welborne Labs? (0.00)
Posted by Dr Deville on 2007-03-14, 16:11:18 (71.226.115.228)
"Hello all. I've been having serious customer support problems with Welborne Labs, and I was wondering if anyone else has had similar issues." .......
5: SET Asylum, Re: Cheap, Excellent, Convenient--Pick Two (0.00)
Posted by Dr Deville on 2007-03-13, 21:04:36 (71.226.115.228)
These threads always concern me, for public perception takes on a life of its own. I'm waiting for a DRD 300B myself and, though I love speedy gratification and personal attention as much as the next .......
6: High Efficiency Speaker Asylum, Re: Dayton OB Woofer, from One Audiofool to Another (0.00)
Posted by Dr Deville on 2007-03-06, 23:16:37 (71.226.115.228)
Hey Jeffrey, Glad to share--link at bottom. I've done lots of virtual shopping, and this is my favorite so far: Specifications: * Power handling: 350 watts RMS/600 watts max * VCdia: 2" * Le: 3.08 mH .......
7: High Efficiency Speaker Asylum, Agreed--Thanks for The Pointers (0.00)
Posted by Dr Deville on 2007-03-06, 16:07:28 (71.226.115.228)
Hey Russ, I've taken a quick look at IIR and FIR filters, and it seems some algorithms (IIR) are not linear phase, but some (FIR) are linear phase. That would be consistent with my original point--th .......
8: High Efficiency Speaker Asylum, Re: Cheaper Lunch (0.00)
Posted by Dr Deville on 2007-03-06, 15:40:28 (71.226.115.228)
Agreed that there's no free lunch, and no solution is completely transparent. That said--from what I've heard personally and my research--active crossovers are potentially much more transparent than p .......
9: High Efficiency Speaker Asylum, It Starts With me! Re: Yup...how does some mis-info start? (0.00)
Posted by Dr Deville on 2007-03-05, 15:15:00 (71.226.115.228)
Hey Russ, I'm a newbie too, so I'm just guessing here. It seems to me that since digital crossovers use number-crunching, and not resonant circuits (whether purely passive, or buffered with op amps), .......
10: High Efficiency Speaker Asylum, Don't Have Dayton 15" IB Woofers Yet Re: Holding out on me huh? (0.00)
Posted by Dr Deville on 2007-03-05, 15:08:49 (71.226.115.228)
Hey Russ, Sorry for the misunderstanding--I said I'm working on the setup (design, construction of preamp and SET at this point), not that I have everythang. I don't have the Dayton OB woofers yet, or .......
11: High Efficiency Speaker Asylum, Re: Digital Filters and Phase (0.00)
Posted by Dr Deville on 2007-03-05, 03:32:27 (71.226.115.228)
Hey NL, Thanks for the update. It's good to know I could spend more money--would that mod be a pretty easy DIY job? Please forgive my sieve-like memory--are you using the Squeezebox and the external v .......
12: High Efficiency Speaker Asylum, Study Required Re: Metal or granite for open baffle (0.00)
Posted by Dr Deville on 2007-03-02, 14:10:56 (71.226.115.228)
Hi Range, Baffle size makes a big difference in multiple ways. If you're interested, you might do some searching--it's complex, and has been much discussed. Best, George .......
13: High Efficiency Speaker Asylum, Reverberance and Directivity Re: reverberant field and CD waveguides, what to do? (0.00)
Posted by Dr Deville on 2007-03-02, 14:07:05 (71.226.115.228)
Hi Russ, I've been following your reports with interest, both because the subject interests me, and because I appreciate you willingness to question your assumptions. So much of audio is confusing, my .......
14: High Efficiency Speaker Asylum, Re: It's Called "Enlightened Self Interest", and I Appreciate It! (nt) (0.00)
Posted by Dr Deville on 2007-02-27, 20:37:17 (71.226.32.119)
Nothing to see here, move along... .......
15: High Efficiency Speaker Asylum, Re: Totally OT--Mercury (0.00)
Posted by Dr Deville on 2007-02-23, 20:45:16 (71.226.32.119)
FWIW, an avid fisherman friend of mine in MI claims that the high mercury measurements come from putting the whole fish in a blender--a method few use, except those luck Bass-O-Matic owners. He claims .......
16: High Efficiency Speaker Asylum, Re: Project Pics 10" Super Audio Nirvana/ Open Baffles (0.00)
Posted by Dr Deville on 2007-02-23, 03:09:27 (71.226.32.119)
Hey Les, Nice job--shore is purty. Brace for question barrage! What wood and finish is that? What are the baffle dimensions? Dang, no more photos of it on your page. I'd like to see some shots of the .......
17: High Efficiency Speaker Asylum, Thanks, As You Were ;^) (0.00)
Posted by Dr Deville on 2007-02-22, 23:43:10 (71.226.32.119)
Hey Kurt, Build something??!!?? Surely you jest! ;) Actually, I'm building the preamp and SET FR amp now, but won't put the speakers together until i sojorn to MI this spring--I plan to use them to ke .......
18: High Efficiency Speaker Asylum, Thread Hijacking Continues... Re: Passive Crossover (0.00)
Posted by Dr Deville on 2007-02-22, 01:03:41 (71.226.32.119)
Hey Kurt, Thanks again for the thoughtful reply. I'm enjoying the back and forth, and appreciate you taking the time with a newbie. Your reasoning seems valid to me--my sympathies. But--doubtless part .......
19: High Efficiency Speaker Asylum, Bare Took A Random Shot At Me Once Too. (nt) (0.00)
Posted by Dr Deville on 2007-02-21, 18:27:31 (71.226.32.119)
And that's all I have to say about that. ;) .......
20: High Efficiency Speaker Asylum, Are You Using Passive Crossovers? Re: TB v. FX120, and PLUTO (0.00)
Posted by Dr Deville on 2007-02-21, 14:09:58 (71.226.32.119)
Hi Kurt, It's good to "hear" of your satisfaction with the Tang Band W4-1320SB . I'm still a little leary of that sharp little peak between 15K and 20K, since I suspect sharp changes in frequency resp .......
21: SET Asylum, Transformers? Re: Amplifier design and quality parts, does it matter? (0.00)
Posted by Dr Deville on 2007-02-20, 01:23:54 (71.226.32.119)
A humble suggestion. As other people have suggested, it's one of those "weakest link" situations--design, parts, and construction all have to be top notch, and one area can't fully compensate for a we .......
22: High Efficiency Speaker Asylum, Thanks Kurt--More Thoughts About Open Baffle Imaging (0.00)
Posted by Dr Deville on 2007-02-19, 23:26:02 (71.226.32.119)
Hi Kurt, I'd like to continue our discussion, if you have the time. I feel bad about hijacking this thread, so if you have an idea of where this would be more appropriate, I'd be glad to move there. " .......
23: High Efficiency Speaker Asylum, Thanks Kurt! Quick Questions Re: Thanks for the Augie Versus Dayton IB Insights, Etc. (0.00)
Posted by Dr Deville on 2007-02-18, 21:01:55 (71.226.32.119)
Hi Kurt, Thanks for taking the time to write your helpful and informative reply. You've given me some things to ponder. I'd like to go open baffle for ease of construction and experimentation and redu .......
24: High Efficiency Speaker Asylum, Thanks for the Augie Versus Dayton IB Insights, Etc. Re: Kurt, I'd like to ask your advice about... (0.00)
Posted by Dr Deville on 2007-02-16, 13:13:11 (71.226.32.119)
Hi Kurt, Thanks for your woofer insights! I've been looking at specs for my own open baffle project, and my simulation showed the same thing--the Dayton IB woofer going deeper and flatter, baffle effe .......
25: Tube DIY Asylum, A Couple of Google Clicks Later... Re: In production... (0.00)
Posted by Dr Deville on 2007-02-15, 03:15:57 (71.226.32.119)
http://stores.ebay.com/Vintage-and-High-End-Audio-from-OBS .......
26: High Efficiency Speaker Asylum, Re: Often Trying, Rarely Succeeding (NT) (0.00)
Posted by Dr Deville on 2007-02-13, 19:54:25 (71.226.32.119)
"I like your attitude. Are you a real Dr. , I mean MD?" Nope, fake doctor. :^D Feel free to send me a PM, I won't clutter up the forum with off-topic stuff more than I already have. .......
27: High Efficiency Speaker Asylum, Often Trying, Rarely Succeeding (NT) (0.00)
Posted by Dr Deville on 2007-02-13, 14:07:49 (71.226.32.119)
But hope springs eternal. .......
28: High Efficiency Speaker Asylum, Construction Details? (0.00)
Posted by Dr Deville on 2007-02-13, 14:06:13 (71.226.32.119)
Hey NL, How did you attach the wings? Any issues/fixes for the woofers vibrating the whole thing? Thanks, George .......
29: High Efficiency Speaker Asylum, Thanks--Very Enjoyable (0.00)
Posted by Dr Deville on 2007-02-13, 01:05:41 (71.226.32.119)
Hey Jeffrey, I was just going to ask you to describe your system's sound, and, voila'! Very convenient! I've always enjoyed OB systems (Magnepan, Dahlquist), so yours certainly has its appeal. Have yo .......
30: High Efficiency Speaker Asylum, Well, Actually the Tweeters are $30 Unless Purchasing More Than Three...Oh... Never Mind! ;^D (nt) (0.00)
Posted by Dr Deville on 2007-02-12, 21:28:19 (71.226.32.119)
(big grin) .......
31: High Efficiency Speaker Asylum, What About Dual FR Drivers? Re: this week's OB experiments and conclusions (0.00)
Posted by Dr Deville on 2007-02-12, 03:03:25 (71.226.32.119)
Just a thought. Dual drivers would seem to give better power handling, but I have no idea if they would cause more problems than they would solve--interference effects, etc? I've done no searching--I .......
32: High Efficiency Speaker Asylum, Wideband Choices --FF225K? Re: this week's OB experiments and conclusions (0.00)
Posted by Dr Deville on 2007-02-11, 23:54:55 (71.226.32.119)
"Another interesting approach would be to use larger FR (wideband actually) drivers for the 100hz-6000hz range and cross to a tweeter around 6K. Then you could use something like a 12' no-whizzer driv .......
33: High Efficiency Speaker Asylum, Gracias, Playing "Big" (0.00)
Posted by Dr Deville on 2007-02-11, 23:39:44 (71.226.32.119)
Hey NL, Thanks for the clarifications--more good stuff. I'm excited about putting together a system like yours, and appreciate your experiences. For me it's all about the vocals--if those aren't right .......
34: High Efficiency Speaker Asylum, $11 (nt) Re: the 'price is right' on this one...... (0.00)
Posted by Dr Deville on 2007-02-11, 18:55:01 (71.226.32.119)
Wow! .......
35: High Efficiency Speaker Asylum, Fun Stuff--Quick Questions (0.00)
Posted by Dr Deville on 2007-02-11, 15:58:39 (71.226.32.119)
Hi NL, I'm one of the interested folks, and I found your post quite thought provoking. I'll ponder more, but have some "quick" questions: 1. What active XO are you using? 2. "but the longer term solut .......
36: High Efficiency Speaker Asylum, I Get A Hump with the Goldwood. ;^) Re: Considered the Dayton IB Woofer? (0.00)
Posted by Dr Deville on 2007-02-09, 15:17:50 (71.226.32.119)
Hi Hitsware, I sincerely appreciate your reply, and checked out the Goldwood with great interest. The price is certainly right (I love cheap), but, plugging it into Xlbaffle.xls , the high Qes of 2.69 .......
37: High Efficiency Speaker Asylum, I Sure Hope Not Re: To clarify (0.00)
Posted by Dr Deville on 2007-02-09, 14:34:07 (71.226.32.119)
Hey Bob, I'm a newbie too, but I've seen much more optimistic (smaller) baffle size estimates. For example, using Thorsten Loesch's xbaffle.xls spreadsheet, and plugging in the Dayton OB woofer mounte .......
38: High Efficiency Speaker Asylum, System Details Re: Dayton IB385-8 Versus Hawthorne Silver Iris Augie (0.00)
Posted by Dr Deville on 2007-02-08, 19:44:33 (71.226.32.119)
Mike Wrote: "Can you post more detail about what the entire system eg why 250hz XO." Thanks Mike--Oh boy can I (grin). The starting point is I'm building a 300B SET (my first SET experience), and want .......
39: High Efficiency Speaker Asylum, Considered the Dayton IB Woofer? (0.00)
Posted by Dr Deville on 2007-02-08, 14:42:03 (71.226.32.119)
Check out: http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=295-455 To my eyes it looks great--what do you think? Best, George .......
40: High Efficiency Speaker Asylum, Dayton IB385-8 Versus Hawthorne Silver Iris Augie (0.00)
Posted by Dr Deville on 2007-02-05, 19:19:13 (71.226.32.119)
Hey Mike, Thanks for the helpful thoughts! Good to hear that beaming might not be an issue. "Most people XO their high mass sub only woofers nearer 100hz so this is abit more difficult.Perhaps more pr .......
41: High Efficiency Speaker Asylum, Thanks NL, that was a lot of very helpful information! (nt) Re: bass in OB (0.00)
Posted by Dr Deville on 2007-02-05, 15:18:24 (71.226.32.119)
Thanks! .......
42: High Efficiency Speaker Asylum, Yes (0.00)
Posted by Dr Deville on 2007-02-05, 14:53:13 (71.226.32.119)
Yes, that's the one. It's good to hear you are happy with it. Like Russ, I'm curious--did you try crossing it over higher? (That may not be worthwhile with your EV s, dunno.) Thanks, George ::: TOPIC: .......
43: High Efficiency Speaker Asylum, Xlbaffle.xls (0.00)
Posted by Dr Deville on 2007-02-05, 14:45:16 (71.226.32.119)
Hi Joe, It seems to float around various places. I searched for Xlbaffle.xls in Google, and found it various places, like: http://baseportal.de/cgi-bin/baseportal.pl?htx=/Data/exdreamaudio/download&cm .......
44: High Efficiency Speaker Asylum, Here Are The Specs Re: Do you think they would run up to 250 hertz well? (0.00)
Posted by Dr Deville on 2007-02-05, 14:32:38 (71.226.32.119)
Hi Russ, I have the same question, since I'd like to experiment, and crossover to the DAYTON IB385-8 somewhere between 200Hz and 500Hz. I'd like to crossover as high as possible (great sound being the .......
45: High Efficiency Speaker Asylum, What About This Example: Dayton 295-455 in 40" Baffle ? (0.00)
Posted by Dr Deville on 2007-02-04, 23:54:14 (71.226.32.119)
Hi Folks, I've been following this thread with interest, for I'm pondering an OB setup myself. I'm wondering about bass extension. Using Thorsten Loesch's Xlbaffle spreadsheet, and plugging in the Da .......
46: High Efficiency Speaker Asylum, Ponderings Re: How does this sound....... Silver Iris, bi-amped using.... (0.00)
Posted by Dr Deville on 2007-01-29, 01:21:21 (71.226.32.119)
Hey Rick, Just looking at specs, and never having heard the stuff, I don't see any show stoppers. The Pyramid lists a THD of 0.01% and 2nd order filters, so it's at least trying. I do like the RCA ja .......
47: High Efficiency Speaker Asylum, Sounds Like a Plan Re: Not yet but I do own a Marchand unit right now... (0.00)
Posted by Dr Deville on 2007-01-28, 00:30:13 (71.226.32.119)
Respect and best wishes on caring for your Dad. It's neat that, even on a budget, a resourceful person can still have creative fun and good sound--re-imagining vintage gear, and combining it with new .......
48: High Efficiency Speaker Asylum, Looks Good--Thanks John! Re: Sometimes it might be better to spend a few more dollars.. (0.00)
Posted by Dr Deville on 2007-01-27, 20:02:52 (71.226.32.119)
Thanks John, That's a resource I hadn't seen. The options are multiplying, which is great! Have you used this unit yet? I'd love to hear some experiences--I like what I see. For what it's worth, March .......
49: High Efficiency Speaker Asylum, Re: So what did you think of it Freddyi? (0.00)
Posted by Dr Deville on 2007-01-27, 16:06:53 (71.226.32.119)
http://www.parts-express.com/pe/pshowdetl.cfm?Partnumber=248-664 .......
50: High Efficiency Speaker Asylum, Re: So what did you think of it Freddyi? (0.00)
Posted by Dr Deville on 2007-01-27, 16:05:59 (71.226.32.119)
And you might check the Behringer units over on partsexpress They have some cheap ones, and I think Behringer is better-known, for what that's worth. .......
51: High Efficiency Speaker Asylum, Thoughts Re: The 2-way unit (0.00)
Posted by Dr Deville on 2007-01-27, 14:25:43 (71.226.32.119)
Hey Rick, Thanks for the links and the idea. I'm building a similar all-open-baffle system, with my current bogie being: * Fostex FE166E fullranger for highs (Madisound) * Dual Dayton IB385-8 15" IB .......
52: High Efficiency Speaker Asylum, Thanks Don, Very Helpful! (nt) Re: Behringer DCX2496 Re: subwoofer crossover (0.00)
Posted by Dr Deville on 2007-01-27, 02:33:32 (71.226.32.119)
nt .......
53: High Efficiency Speaker Asylum, Agreed--I Think I Used Confusing Terminology Re: Passive ? I doubt (0.00)
Posted by Dr Deville on 2007-01-25, 19:23:42 (71.226.32.119)
Hi Chris-- We are on the same page. I guess my "passive line level" crossover really isn't passive in the general sense. I'm speaking of inserting a filter composed of passive LRC elements between the .......
54: High Efficiency Speaker Asylum, Cool Stuff Re: DCX and SET?, will be long... such a nice subject (0.00)
Posted by Dr Deville on 2007-01-25, 13:20:37 (71.226.32.119)
Thanks for the fascinating info, Chris. You sound like a similarly eclectic geek. I'll follow up on your leads. Ever thought of feeding a digital signal directly from a pc/cd into your Behringer, and .......
55: High Efficiency Speaker Asylum, Re: DCX and SET?, will be long... such a nice subject (0.00)
Posted by Dr Deville on 2007-01-24, 22:59:28 (71.226.32.119)
Hey Chris, Greetings, fellow heretic! Yes, I have a tendency to want to do things differently, which is one reason I got out of flying, and do not work with radioactive materials. In audio, if I keep .......
56: High Efficiency Speaker Asylum, Gracias Jeffrey Re: The lowest price I found in the US is... (0.00)
Posted by Dr Deville on 2007-01-24, 21:35:12 (71.226.32.119)
Thanks for the price source, and for sharing what you've heard. I googled on "driverack pa dcx2496" and came up with this discussion on prosoundweb: http://srforums.prosoundweb.com/index.php/pv/117/0 .......
57: High Efficiency Speaker Asylum, Prices & Sources on the dBx? Re: I too will soon have a system composed of an SET amp (0.00)
Posted by Dr Deville on 2007-01-24, 11:52:26 (71.226.32.119)
Hey Jeffrey, Thanks for the tip--the dbx looks cool. What aspects of it did your source like? Better sound? Offhand, do you have any sources/prices on it? I can double click around later. My strategy .......
58: High Efficiency Speaker Asylum, Behringer DCX2496 Re: subwoofer crossover (0.00)
Posted by Dr Deville on 2007-01-23, 22:58:09 (71.226.32.119)
Hey Chris, I'm eyeing the Behringer DCX2496 myself. Can you give my your impression in terms of sound? (I'm pretty darned sure it will do any function I need, and them some.) I'd appreciate if you cou .......
59: High Efficiency Speaker Asylum, Passive Line Level Crossover ( PLLXO ) Components and Sources (0.00)
Posted by Dr Deville on 2007-01-22, 20:03:20 (71.226.32.119)
Hey Thanks Guys, I appreciate your ideas and encouragement. Now I'm debating between open baffle bass, or sealed box. thoughts? I think I have a handle on passive line level crossover ( PLLXO ) design .......
60: Tweakers' Asylum, Models and Suppliers for Line Level (low current) Inductors? (0.00)
Posted by Dr Deville on 2007-01-22, 14:10:34 (71.226.32.119)
I'm looking to build some passive line level crossovers ( PLLXO ), and would like some help in locating specific inductors and suppliers. I can't seem to find them at my usual boutique suppliers, and .......
61: High Efficiency Speaker Asylum, Parts and Designs for Passive Line Level Crossovers? ( PLLXO ) (0.00)
Posted by Dr Deville on 2007-01-22, 14:03:35 (71.226.32.119)
Hi All, I want to run some full range drivers crossed over to woofers. To keep efficiency up I want to use a passive line lever crossover ( PLLXO) . I think I have a pretty good handle on the theory, .......
62: High Efficiency Speaker Asylum, Thanks JandG--Now to Pump You For Information (g) (0.00)
Posted by Dr Deville on 2007-01-20, 20:52:45 (71.226.32.119)
Thanks JandG, Your experiences are interesting and informative. Now for the followup questions. (grin) I'm fairly clueless about open baffle, so I hope you'll tolerate me. Okay, now your bass solution .......
63: High Efficiency Speaker Asylum, Full Range with Subs -- Sealed Box Versus Open Baffle ? (0.00)
Posted by Dr Deville on 2007-01-20, 16:04:09 (71.226.32.119)
Hi All, I'm currently building a 300B SET amp and (nearly) full range speakers, to experience some of that SET - Fullrange magic I hear about. I want to be able to play complex, bass-heavy music witho .......
64: Bottlehead Forum, Check out dynakitparts.com nt (0.00)
Posted by Dr Deville on 2007-01-15, 14:12:35 (71.226.32.119)
nt .......
65: Bottlehead Forum, What About Bypassing? Re: Capacitors in Parallel (0.00)
Posted by Dr Deville on 2007-01-15, 14:08:51 (71.226.32.119)
I'm talking about bypassing a necessarily large and low-quality cap, with a smaller, high quality cap? ( In the signal path, or elsewhere.) Opinions? .......
66: Tube DIY Asylum, It's a Firesign Theater Quote Re: It's just this little chromium switch here... (0.00)
Posted by Dr Deville on 2007-01-15, 03:34:12 (71.226.32.119)
And yes, I'm 51. Mahatma knows culture. (slightly more recent reference) .......
67: Tube DIY Asylum, D'oh! Millivolts, NOT Milliamps (0.00)
Posted by Dr Deville on 2007-01-15, 03:30:41 (71.226.32.119)
Ah, I should have known better that write during a break from 24. Hanging my head... George .......
68: Tube DIY Asylum, Re: Tube Biasing (0.00)
Posted by Dr Deville on 2007-01-15, 01:22:50 (71.226.32.119)
0.4V is 400mA (millliamps). It should be DC. .......
69: Tube DIY Asylum, Gracias, Big Muck! nt (0.00)
Posted by Dr Deville on 2007-01-14, 21:36:19 (71.226.32.119)
nt .......
70: Tube DIY Asylum, Sources? (0.00)
Posted by Dr Deville on 2007-01-14, 15:56:17 (71.226.32.119)
Thanks Big Muck, I'm building a DRD 300B, and am interested too. Can you tell me your source for these (if that's legal)? Thanks! George .......
71: Tube DIY Asylum, The Blizzards Have Been A Problem (0.00)
Posted by Dr Deville on 2007-01-12, 03:40:50 (71.226.32.119)
Hi All, FWIW, from a message from Rob yesterday: "We are still recovering from the back-to-back blizzards as they creacted a real havoc hear in the Denver area. More snow scheduled for this weekend wh .......
72: Tube DIY Asylum, Any Fellow Vanderveen / Plitron Cathode Feedback Inmates? (0.00)
Posted by Dr Deville on 2007-01-11, 18:28:18 (71.226.32.119)
Hi All, After a couple of years off, I'm resuming my work on monoblocks based on Menno Vanderveen ( Van der Veen ) 's CFB2100 cathode feedback design ( Plitron transformers). I'd appeciate exchanging .......
73: Tube DIY Asylum, No Problems Here (0.00)
Posted by Dr Deville on 2007-01-11, 18:16:13 (71.226.32.119)
I've asked him a couple of questions since the first of the year, and both times received helpful replies within a couple of days. .......
74: Bottlehead Forum, Wow, I Can Actually Duplicate Your Results!... (grin) (0.00)
Posted by Dr Deville on 2007-01-09, 23:56:15 (71.226.32.119)
Hey Paul, After I digested your post a bit more, I went back to the sealed box calculator, and compared the FE166E in a 1/4 ft^3 box with what you said. Sure enough, it spits out a resonance at 135Hz, .......
75: High Efficiency Speaker Asylum, Considered Bottlehead's SEXy Speaker Design? (0.00)
Posted by Dr Deville on 2007-01-09, 13:07:02 (71.226.32.119)
Hi Freddy, If you don't know if it already, Bottlehead's design (on their SEX amp page) addresses exactly that issue by putting the FR in a sealed box to limit excursion, and using dual subs below 120 .......
76: Bottlehead Forum, Excellento! (0.00)
Posted by Dr Deville on 2007-01-09, 01:02:58 (71.226.32.119)
Thanks Paul, You should charge for your posts--each one is a mini-university for me. Hey, I'm not paying, so at least I can be nice! (grin) Thanks again--very helpful. You kept me from "improving" the .......
77: Bottlehead Forum, FE166E Versus FE167E in S.E.X.y Speaker? (0.00)
Posted by Dr Deville on 2007-01-08, 23:24:46 (71.226.32.119)
Hi Folks, Could someone endlighten me on the tradeoffs between the Fostex FE166E and FE167E in the SEXy speaker? I love the idea and that Paul and Doc have posted it for all to use. I'm debating on wh .......
78: SET Asylum, Hey Paul, Did You Ever Try the Ported Boxes With A High Pass Filter (0.00)
Posted by Dr Deville on 2007-01-05, 17:40:23 (71.226.32.119)
Hi Paul, I've been pondering your very informative post about ported ( BR ) boxes versus sealed boxes with subwoofers, reduced distortion in the sealed box, etc. I'm wondering--did you ever try the po .......
79: SET Asylum, What Box Did You Build? Re: Fostex FE166 (0.00)
Posted by Dr Deville on 2007-01-05, 14:17:17 (71.226.32.119)
Hi! What box did you build? I'm thinking of a simple, small BR box for my FE166E speakers. Thanks! .......
80: SET Asylum, Groovy--Please Share Your Review! (0.00)
Posted by Dr Deville on 2007-01-05, 13:43:31 (71.226.32.119)
Hey Tom, You make sense to me. I hope you share your review of your FX120 system--it could be ideal for me as a personal/nearfield system. I'm pondering on Paul Joppa's insights on acoustic (sealed bo .......
81: SET Asylum, We're Talking About the FE166E for Sealed Boxes and 94dB Efficiency (0.00)
Posted by Dr Deville on 2007-01-04, 21:38:20 (71.226.32.119)
Hey Tom, Thanks for the info! I think you know this, but just to clarify, Paul and I were talking about sealed boxes to limit low frequency excursion, so your BR comments wouldn't apply there. I certa .......
82: SET Asylum, Thanks Again Paul--Very Useful (0.00)
Posted by Dr Deville on 2007-01-04, 01:42:00 (71.226.32.119)
Just as I expected--you were gracefully referring to your S.E.X.y speaker. Nice. You're comments are just what I needed. As I chart my course into the SET dimension, I'm balancing SET-nurturing simpli .......
83: SET Asylum, Thanks Paul--Highpass Question? Re: Sure it's not your amp .... (0.00)
Posted by Dr Deville on 2007-01-03, 21:35:15 (71.226.32.119)
Hey Paul, Thanks for your review, I found it very helpful. I'm considering the sealed system you mention, having seen a similar (or perhaps identical) system recommended on the Bottlehead site (you ma .......
84: SET Asylum, Re: Bi-amping my Tannoys with 300B and 845 SET (0.00)
Posted by Dr Deville on 2006-12-28, 22:03:35 (71.226.32.119)
I've heard fantastic improvements with active crossovers, much more than the mere increase in power. Much more clarity--as if layers of distortion have been removed. Just my two cents worth. George :: .......
85: High Efficiency Speaker Asylum, Thanks! Re: Starter, Turnkey HES, For Say $1K/pair? (0.00)
Posted by Dr Deville on 2006-12-23, 12:47:15 (71.226.32.119)
Hi GM, Thanks for the link and the advice--you gave me a nice point of reference, and the system itself looks quite appealing. From the graphs, it looks like the FT-1600 actually has flatter mid-band .......
86: High Efficiency Speaker Asylum, "Turnkey" Clarification Re: Starter, Turnkey HES, For Say $1K/pair? (0.00)
Posted by Dr Deville on 2006-12-22, 15:02:02 (71.226.32.119)
Hi All, I'm willing to put drivers in a box, solder a crossover, etc. I just don't have the time to design a system, build a box from scratch, etc. I hope this brings some ideas to mind. :) ::: TOPIC: .......
87: High Efficiency Speaker Asylum, Starter, Turnkey HES, For Say $1K/pair? (0.00)
Posted by Dr Deville on 2006-12-22, 14:22:39 (71.226.32.119)
Hi Gang, I'm renovating a summer place in MI--it's a complete mess, and some luscious audio would help take the edge off, and perhaps keep me from running screaming into the abyss. I'm thinking of usi .......
88: Tube DIY Asylum, I'll Take The Easy Ones... (0.00)
Posted by Dr Deville on 2005-01-10, 11:37:41 (68.32.213.214)
Greetings 7591, Welcome to the endlessly satisfying world of DIY. I'll attempt to do my part by answering some of the easier questions, leaving corrections and additions to the experts. To wit: >Is th .......
89: Tube DIY Asylum, Thanks VS--Email Is On It's Way! nt (0.00)
Posted by Dr Deville on 2005-01-08, 23:36:21 (68.32.213.214)
You guys rock. .......
90: Tube DIY Asylum, Good... Good... Now, Just A Little Bit Further... (0.00)
Posted by Dr Deville on 2005-01-08, 23:35:14 (68.32.213.214)
Gentlemen, I am thrilled to have your participation. Now if I can just coax you to suggest a specific part and circuit... (I'll bet you could do that with one lobe tied behind your back.) If its any h .......
91: Tube DIY Asylum, Is The DN3545 A Good Replacement For The DN2540? (0.00)
Posted by Dr Deville on 2005-01-07, 22:23:08 (68.32.213.214)
Greetings All, Regarding the DN2540 availability issue in the mesage below, from the mouser website it appears that the DN3545 has supplanted it, with better specs, including 450V breakdown voltage an .......
92: Tube DIY Asylum, Cool! A Reply From Voltsecond! Begin Info Dump... (0.00)
Posted by Dr Deville on 2005-01-07, 20:32:25 (68.32.213.214)
Hey VS, Thanks for the help! I'll smother you with info, in hopes of providing at least as much as you need. :^D I'm looking at using the same setup in two applications: CCS sources above grounded cat .......
93: Tube DIY Asylum, Reasonable To Replace CCCSBO... Battery Bias (say 13V) With Gary Pimm's Self Bias Technique? (0.00)
Posted by Dr Deville on 2005-01-07, 15:46:22 (68.32.213.214)
Greetings Inmates, Reading throught the archives, it seems that sand CCS's, whether Mosfet or DN2540 based, exhibit lower noise with greater bias voltage. (13V seems to be about the point of diminishi .......
94: Tube DIY Asylum, Thanks Allen--Very Helpful (Troll-free Zone ;^) nt (0.00)
Posted by Dr Deville on 2005-01-04, 21:21:26 (68.32.213.214)
Thanks! .......
95: Tube DIY Asylum, Thanks Allen--Same For Marchand XM126 (0.00)
Posted by Dr Deville on 2005-01-02, 14:11:34 (68.32.213.214)
Hey Allen, Thanks for the insights! I'll be building a Marchand XM126 tube active crossover (there's a link at the bottom in case you want to take a look.) Would you make the same recommendations for .......
96: Tube DIY Asylum, Hmmm... I Think The "$30 Minimum Charge" Requirement Is Redundant... nt (0.00)
Posted by Dr Deville on 2004-12-27, 21:02:28 (24.4.42.77)
Nothing to see here... .......
97: Tube DIY Asylum, Thanks Russ! (0.00)
Posted by Dr Deville on 2004-12-27, 00:15:39 (24.4.42.77)
Hey Russ, Thanks for your very helpful postings, here and elsewhere. Although your original recollection turned out to be false, your friendly and helpful attitude created a dialog that educated me mu .......
98: Tube DIY Asylum, Ah, Perfect! I Bow To You, Tom Bavis! :^) (0.00)
Posted by Dr Deville on 2004-12-25, 11:29:08 (24.4.42.77)
Hey Tom, Grrrreat! I'm a Plitron fan and had even checked their site, but had missed the surplus link. Those transformers are perfect, and a steal. You just made my Christmas merrier. :^D Thanks Agai .......
99: Tube DIY Asylum, Wouldn't That Output 240VAC? (0.00)
Posted by Dr Deville on 2004-12-25, 11:25:18 (24.4.42.77)
Hey Tom, Thanks for helping! Or use a dual 120 : dual 120 toroid for 120 : 360VAC at half its usual VA rating... Just to check my understanding, are you suggestion connecting the primaries in paralle .......
100: Tube DIY Asylum, No Joy, But Thanks For The Tip Victor (0.00)
Posted by Dr Deville on 2004-12-25, 11:18:18 (24.4.42.77)
Hey Victor, I Googled around and found Avel Lindberg--they have toroids, but I didn't see any that step up as high as 300VAC. Many thanks for the tip, and happy holidays! George Ferguson .......
101: Tube DIY Asylum, Love It (0.00)
Posted by Dr Deville on 2004-12-23, 00:26:05 (68.32.213.214)
I have TubeCAD, and find it indespensible. It is not perfect, and I hope JB updates and expands it, but it is wonderful for prototyping, and learning design cause-and-effect. Buy it, you'll like it. b .......
102: Tube DIY Asylum, Source For Small 120VAC to 300VAC Power Transformer? (Toroid?) (0.00)
Posted by Dr Deville on 2004-12-22, 18:57:00 (68.32.213.214)
Hi Folks, Since my first idea for a small power transformer for my portable (with a fork lift) headphone amp may break the laws of physics, I am looking for another solution. Can anyone suggest a rela .......
103: Tube DIY Asylum, Thanks Guys! (0.00)
Posted by Dr Deville on 2004-12-22, 18:48:59 (68.32.213.214)
As an aside, why does there seem to be so few female DIY audio enthusiasts? Is our avocation one of those male, Tool Time, "more power, uh, uh, uh!" things? Anyway, thanks for all your answers, even w .......
104: Tube DIY Asylum, Run Step-Down Power Transformer Backwards, For Step Up? (0.00)
Posted by Dr Deville on 2004-12-21, 18:55:24 (68.32.213.214)
Greetings Inmates, Please forgive me if the application I'm pondering is just unbelievably stupid. I'm wondering if it is possible and safe to run a step-down power transformer backwards, to get an in .......
105: Tube DIY Asylum, Check My Work? CCS 6SN7 Grounded Cathode White CF Parafeed (Gasp) (0.00)
Posted by Dr Deville on 2004-12-18, 21:23:16 (68.32.213.214)
Greetings Fellow Fanatics, Thanks to your help, I am slapping together my headphone amp (called the Chicken Coop, for reasons that will become obvious later), for a Christmas trip. Joy! I have the par .......
106: Tube DIY Asylum, You Are Correct, Sir! (0.00)
Posted by Dr Deville on 2004-12-14, 20:00:40 (68.32.213.214)
Hey Doc! What's up? ;^) I think you meant Z-out at 1/10 the Z-in of the next stage. I did indeed! I guess it's just too much to expect my brains and my fingers to both be correct at the same time. ;^ .......
107: Tube DIY Asylum, VC On Linestage Output (0.00)
Posted by Dr Deville on 2004-12-14, 12:26:06 (68.32.213.214)
Hey LineArrayNut & Steve, Thanks for the preamp tip. Very interesting! Regarding the output VC, my semi-informed conclusion is that you are correct--it reduces noise, at the expense of increased Zout. .......
108: Tube DIY Asylum, Thanks For The Excellent Insights (0.00)
Posted by Dr Deville on 2004-12-12, 12:26:06 (68.32.213.214)
Hey NL, You've elegantly described what I've learned from a week or so of splashing around in the intellectual swamp of my brain. For the time being I'm emotionally fixated on 6SN7's, and I've conclud .......
109: Tube DIY Asylum, Ah! From Other Branch of Thread, OPT Is Cap-Coupled as a Parallel Load nt (0.00)
Posted by Dr Deville on 2004-12-09, 23:02:18 (68.32.213.214)
Just thought I'd share. XD .......
110: Tube DIY Asylum, Another Question, Of Course :^) (0.00)
Posted by Dr Deville on 2004-12-09, 10:46:01 (68.32.213.214)
Hey Pedroskova, Could you educate me as to the purpose of the RC combo across the secondary in Max Huber's schematic? To provide sufficient load on the primary side? Thanks again, George Ferguson ::: .......
111: Tube DIY Asylum, Just The Info I Needed--You Guys Rock! (0.00)
Posted by Dr Deville on 2004-12-09, 10:34:51 (68.32.213.214)
Hey Pedroskova and Peter, Many thanks--that is exactly the info I needed, and very cool. That bit of information makes my day. What impedance headphones are you dudes using? Mine are 300R. Thanks agai .......
112: Tube DIY Asylum, As When I Began Dating, I Am Unsure About Placement (0.00)
Posted by Dr Deville on 2004-12-09, 01:29:11 (68.32.213.214)
Hey Mark, Many thanks! I forgot that you are an Aussie, but I'll look up the tranny you described, and find a comparable item locally. I'm not sure I understand your OT placement instructions, so here .......
113: Tube DIY Asylum, Hmmm... How About This? (0.00)
Posted by Dr Deville on 2004-12-08, 22:32:57 (68.32.213.214)
Hey Mark, Thanks for the suggestions and encouragement. It helps to bounce ideas off people--especially those who know more. :^) I imagine my conventional power tranny wouldn't have DC problems, but p .......
114: Tube DIY Asylum, Quick And/Or Temporary Headphone OPT Solution? Radio Shack Power Transformer? (0.00)
Posted by Dr Deville on 2004-12-08, 19:38:51 (68.32.213.214)
Greetings Inmates, As I continue to educate myself by investigating headphone amplifier designs (A process similar to drinking out of a firehose, BTW. ;^), I am now considering transformer-coupled des .......
115: Tube DIY Asylum, Thanks Gregorach--I'll Poke Around There nt (0.00)
Posted by Dr Deville on 2004-12-06, 23:09:36 (68.32.213.214)
[poke] .......
116: Tube DIY Asylum, Thanks Ray! You've Given Me Some Good Stuff To Ponder nt (0.00)
Posted by Dr Deville on 2004-12-06, 23:08:44 (68.32.213.214)
[pondering] .......
117: Tube DIY Asylum, Thanks Ray! Educate Me A Bit More? (0.00)
Posted by Dr Deville on 2004-12-06, 11:18:08 (68.32.213.214)
Hey Ray, Thanks for the helpful message. I'm curious about your recommendation for separate filament windings: 1. Is that out of filament-cathode overvoltage concerns, noise concerns, or both? 2. Why .......
118: Tube DIY Asylum, Now I'm Completely Depressed. ;^) nt (0.00)
Posted by Dr Deville on 2004-12-06, 00:24:48 (68.32.213.214)
garsh! .......
119: Tube DIY Asylum, Any Experiences With/Opinions Of White Cathode Follower? (0.00)
Posted by Dr Deville on 2004-12-05, 17:30:34 (68.32.213.214)
Hey Inmates, Please forgive me for posting this again--my first post on this (buried in a thread) got no replies, so I'm trying again. In brief, I'm designing a headphone amp and, since I can't get Lu .......
120: Tube DIY Asylum, Thanks Ray--Just What I Need! :^D nt (0.00)
Posted by Dr Deville on 2004-12-04, 23:40:06 (68.32.213.214)
Oh that Ray, he does a good job. nt .......
121: Tube DIY Asylum, Consider Plitron / Vanderveen Trannies (0.00)
Posted by Dr Deville on 2004-12-04, 18:20:20 (68.32.213.214)
Hey 7591, Welcome to a rewarding obsession! Consider Plitron / Vanderveen transformers. They are arguably (IMO, etc., etc.) as good or better than classic designs, offering excellent sonics at the exp .......
122: Tube DIY Asylum, How About A White Cathode Follower? (0.00)
Posted by Dr Deville on 2004-12-03, 20:20:28 (68.32.213.214)
Greetings Inmates, Well, I've been scheming away, and here's what I've come up with. I had my eye on a transformer-coupled design, but K & K can't get me the Lundahl LL1630/5mA for about 6 weeks, and .......
123: Tube DIY Asylum, Agreed--Funny And Wise. He Is Missed. nt (0.00)
Posted by Dr Deville on 2004-12-02, 17:05:49 (68.32.213.214)
He's in thermionic heaven! nt .......
124: Tube DIY Asylum, Thanks--Another Link? (0.00)
Posted by Dr Deville on 2004-12-02, 12:16:38 (68.32.213.214)
Hey M, Thanks for your message and link. I'd enjoy seeing your photo, but the link didn't come through. Any suggestions? Thanks again, George Ferguson .......
125: Tube DIY Asylum, Sir Millet--You're The Man! ;^) (0.00)
Posted by Dr Deville on 2004-12-02, 12:10:47 (68.32.213.214)
Hey Pete, Thanks for the very helpful advice and guidance--I will follow it. And thanks for your equally helpful and generous website and other posts here. In the past I've restrained myself from sayi .......
126: Tube DIY Asylum, Thanks Jimmy! (0.00)
Posted by Dr Deville on 2004-12-02, 12:01:31 (68.32.213.214)
I appreciate your comments and your specific part/supplier tips. Happy Holidays, dude! Best, George Ferguson .......
127: Tube DIY Asylum, Portable / Mobile Headphone Amplifier Considerations (0.00)
Posted by Dr Deville on 2004-12-01, 20:46:55 (68.32.213.214)
Hello Inmates, Greetings From The Lunatic Fringe! For holiday-travel consolation, I am pondering a mobile headphone amp. I'm imagining an AC-driven (from AC converter) buffer amp, between my portable .......
128: Tube DIY Asylum, Something's Burning... I Think Its, Er, "Love" (0.00)
Posted by Dr Deville on 2004-11-30, 11:52:19 (68.32.213.214)
Call the doctor! Har! Hey Douglas, Congratulations on your satisfying DIY journey--one can end up at the "same place" with quite different perceptions. My journey continues to be fun and rewarding, an .......
129: Tube DIY Asylum, Fair Enough (0.00)
Posted by Dr Deville on 2004-11-29, 17:04:53 (68.32.213.214)
Hey Douglas, Thanks for the gracious reply. FWIW, your project postings, both verbal and photographic, regularly fill me with major techno-lust. Even without aligned screw heads. ;^) Best, George "Mos .......
130: Tube DIY Asylum, Some Gizmo Philosophy (0.00)
Posted by Dr Deville on 2004-11-29, 17:00:54 (68.32.213.214)
Hey Rick, Here's a bit of DIY philosophy, coming to you from the late Harvey "Gizmo" Rosenberg: http://www.meta-gizmo.com/Tri/4w/Plitron4W.html The article itself is Plitron-centric, but DIY insights .......
131: Tube DIY Asylum, Hey, I'm An *Expert* In Poor Workmanship! (0.00)
Posted by Dr Deville on 2004-11-26, 22:58:45 (68.32.213.214)
Har! ;^) I say that he hs done perfect work. Agreed. since a custom starting pitch on each screw is the only other way If you examine the photo, you'll see that's simply not true. I'm afraid you're w .......
132: Tube DIY Asylum, Constructive Criticism... (0.00)
Posted by Dr Deville on 2004-11-25, 00:27:15 (68.32.213.214)
Hey Elan, I hate to mention this, but I'm afraid your transformers' screw slots are not parallel. Har! ;^) Just kidding--that is one be-you-te-ful amp! Now I want cocobolo too... Thanks for the photo .......
133: Tube DIY Asylum, Thanks For The Info Mark! nt (0.00)
Posted by Dr Deville on 2004-11-18, 22:41:52 (68.32.213.214)
You're a true gentleman! .......
134: Tube DIY Asylum, Please Stay Grandiose! (0.00)
Posted by Dr Deville on 2004-11-18, 21:54:43 (68.32.213.214)
Hey Henry, Thanks for the info, and tales of shipping woe. :^) I'm sort of giving up on the grandiose cathode feedback scheme. Nooo! Stick with it, so I'll have another co-conspirator! I'm building an .......
135: Tube DIY Asylum, Re: Thanks For The Confirmation, And The Hardware Porn :^) (0.00)
Posted by Dr Deville on 2004-11-17, 22:56:02 (68.32.213.214)
Hey Henry, Thanks for giving me the chance to test my understanding. And say, that's a mighty nice attic you have there! Man I love those oilers--I bought a case of them. What sort of iron do you have .......
136: Tube DIY Asylum, Re: Might Amplifier Class Matter? (0.00)
Posted by Dr Deville on 2004-11-17, 17:46:31 (68.32.213.214)
Greetings Henry & All, Might amplifier class influence power supply capacitor ringing? As I understand it (open to correction) class A amps draw, to a first order approximation, the same PS current re .......
137: Tube DIY Asylum, Generalizations, Cathode Feedback Alternative (0.00)
Posted by Dr Deville on 2004-11-13, 10:35:27 (68.32.213.214)
Hey Garman and All, Thanks for the fun thread! :^) As you may have surmised, generalizations are useful, but limited. From what I can see, a given design is limited by its weakest link, but it's very .......
138: Hi-Rez Highway, Thanks Folks, I Appreciate Your Comments! nt (0.00)
Posted by Dr Deville on 2004-11-12, 09:41:13 (68.32.213.214)
Thanks again! ;^) .......
139: Hi-Rez Highway, New Elton John SACD Reviews? (0.00)
Posted by Dr Deville on 2004-11-11, 11:41:32 (68.32.213.214)
Greetings Inmates, As a huge Elton John fan (particularly his earlier stuff), I am awaiting his new SACD releases with great anticipation. Would you please share your impressions of the new releases? .......
140: Tube DIY Asylum, Amen! nt (0.00)
Posted by Dr Deville on 2004-11-09, 23:05:49 (68.32.213.214)
What Jimmy said! .......
141: Tube DIY Asylum, You Guys Rock! (0.00)
Posted by Dr Deville on 2004-11-08, 10:54:11 (68.32.213.214)
Mark and Lynn, Thanks for another informative and gorgeous contribution. Just looking at that photo of your turntable/amp with the beautiful wood and copper chassis, gave me major geek lust. Care to s .......
142: Tube DIY Asylum, Which Tranny? :^) (0.00)
Posted by Dr Deville on 2004-11-08, 10:43:53 (68.32.213.214)
Hey Mercury, er, HeelWing, Thanks for the review! I'm building a DacKit with my own tube output stage. Care to share tranny model and source? Best, George Ferguson .......
143: Planar Speaker Asylum, Get the 1.6s, With A Tube Amp of 100WPC Or More nt (0.00)
Posted by Dr Deville on 2004-11-08, 00:16:22 (68.32.213.214)
Hey--hey asked! :^) .......
144: Tube DIY Asylum, Revised Schematic, For Review (0.00)
Posted by Dr Deville on 2004-11-07, 20:41:45 (68.32.213.214)
Greetings, Gary and All, Here is my revised schematic, which attempts to incorporate Gary's suggestions. The changes: 1. Op-amp changed to a OPA134, with intended configuration of unity and 10x gain-- .......
145: Tube DIY Asylum, Thanks Again Gary--I'll Ponder And Revise (nt) (0.00)
Posted by Dr Deville on 2004-11-06, 19:15:36 (68.32.213.214)
Ah, another fun Saturday night! ;^) .......
146: Tube DIY Asylum, Groovy! A Quick Q (0.00)
Posted by Dr Deville on 2004-11-06, 11:18:39 (68.32.213.214)
Hey Gary, Thanks for checking my work--it makes all the difference. Boy, that is a statement about e-geeks lives, a happy Friday evening drawing schematics!! So true. At my advanced age I've learned t .......
147: Tube DIY Asylum, I Already Realize I Forgot the R2 Bypass Cap(s) nt (0.00)
Posted by Dr Deville on 2004-11-06, 00:10:06 (68.32.213.214)
D'oh! .......
148: Tube DIY Asylum, Gary, hifiZen, Et. Al.--Please Review This Prototype Soundcard Test Interface :^) (0.00)
Posted by Dr Deville on 2004-11-06, 00:01:34 (68.32.213.214)
Hey Gary hifiZen & All, I've pondered on Gary and hifiZen's suggestions, learned a bit about op-amps, and this is what I came up with. Would you please critique it? Some comments follow to explain my .......
149: Tube DIY Asylum, Thanks Pete--Very Helpful! nt (0.00)
Posted by Dr Deville on 2004-11-04, 19:58:05 (68.32.213.214)
Good info to have. .......
150: Tube DIY Asylum, Douglas!!! Put That Away!!! (0.00)
Posted by Dr Deville on 2004-11-04, 14:50:51 (68.32.213.214)
Har! Anyway, my understanding is that AC, by continually reversing the cap's charge, causes more stress and heat. Hence DC ratings which can be more than 1.4 x the AC rating. I know that if I were a c .......
151: Tube DIY Asylum, Thanks, Masked Wonder! I'll Ponder And Draw (0.00)
Posted by Dr Deville on 2004-11-03, 22:42:17 (68.32.213.214)
Hey Gary, Yes, your post was extremely helpful. I'm in the process of designing something remotely similar to your buffer, based around the TL071 and loosely resembling the "Soundcard Isolator" desig .......
152: Planar Speaker Asylum, Go For the 1.6--You Know You Want To :^) ) nt (0.00)
Posted by Dr Deville on 2004-11-03, 19:43:31 (68.32.213.214)
Or the 3.6, if you are completely insane like me. .......
153: Tube DIY Asylum, Re: Three Words: Bottlehead, Bottlehead, Bottlehead (0.00)
Posted by Dr Deville on 2004-11-03, 19:33:08 (68.32.213.214)
Hey Sloopjazz, You are very welcome. You will never regret going Bottlehead--just remember to learn and follow the correct high voltage safety procedures! Regarding what level of difficulty to start w .......
154: Tube DIY Asylum, Three Words: Bottlehead, Bottlehead, Bottlehead (0.00)
Posted by Dr Deville on 2004-11-03, 17:45:47 (68.32.213.214)
Hey SJ, Welcome! Abandon all hope--life as you knew it is over. A real easy recommendation is Bottlehead products--just click your way over to their AudioAsylum forum. There are at least three compell .......
155: Tube DIY Asylum, A Simpler Solution: A Resistor Instead of Zeners? (0.00)
Posted by Dr Deville on 2004-11-03, 17:38:17 (68.32.213.214)
Hey Folks, Okay, okay. I grasp the obvious eventually , it just takes me a bit longer than most. It occurs to me that all I have to do is put a dropping resistor between B+ and the CCS to drop the vol .......
156: Tube DIY Asylum, Thanks Gary! (Invevitable) Levels Question (0.00)
Posted by Dr Deville on 2004-11-03, 17:29:50 (68.32.213.214)
Thanks Gary, You data is interesting indeed, and feeds my ongoing Soundcard-Spectrum Analyzer lust. I'm setting the sensitivity of my HV-Soundcard interface (which I will share here), and would much .......
157: Tube DIY Asylum, I Guess That Makes Me Bilogous :^) nt (0.00)
Posted by Dr Deville on 2004-11-03, 17:17:57 (68.32.213.214)
I describe both ways! .......
158: Tube DIY Asylum, Slam Dunk! nt (0.00)
Posted by Dr Deville on 2004-11-01, 22:25:33 (68.32.213.214)
No Text Here. .......
159: Tube DIY Asylum, And Gary Appears From The Bat Cave! (0.00)
Posted by Dr Deville on 2004-11-01, 22:22:17 (68.32.213.214)
Hey Gary, Fascinating measurments--thanks! I hope I have better luck with using my Audigy2 as a SA than you did, though I can't imagine why I would. And now, as my college lecturers would say, for Geo .......
160: Tube DIY Asylum, Bart! Stop Teasing The Newbie!! (0.00)
Posted by Dr Deville on 2004-11-01, 19:25:25 (68.32.213.214)
Hey Douglas, it was late, and I was tired Fair enough. :^) Hmmm... is there such a thing as a 400V zener? Or would over-voltage protection cause more trouble than its worth? It's amazing how quickly s .......
161: Tube DIY Asylum, Good Point--Thanks Meister (0.00)
Posted by Dr Deville on 2004-11-01, 19:19:42 (68.32.213.214)
Hmmm... An AC peak like you describe could cause more than a breakdown in headroom--more like CCS death. Thanks for the heads up. Best, George Ferguson .......
162: Tube DIY Asylum, Then Riddle Me This, Caped Crusader... (0.00)
Posted by Dr Deville on 2004-10-31, 20:37:02 (68.32.213.214)
How come I have, right here , the link to Gary's self-bias CCS? http://home.pacifier.com/~gpimm/self_bias.htm But please, do draw a diagram! :^) Any idea whether Pimm's battery bias would have lower n .......
163: Tube DIY Asylum, But!!! That's Just What They'll Be Expecting!!!!* (0.00)
Posted by Dr Deville on 2004-10-31, 19:41:25 (68.32.213.214)
Hey Douglas, And I am indeed fortunate that you are present and responsive. You're a darned helpful guy, you know that? I would recommend using Gary's IRF820 circuit is you need to expose the devices .......
164: Tube DIY Asylum, Horneman-Pimm-Sector7G-Davenport Cascade DN2540 CCS Qs (0.00)
Posted by Dr Deville on 2004-10-31, 17:43:40 (68.32.213.214)
Hello Fellow Inmates And Acolytes of the CCS Temple, Thanks for the CCS information you have so generously provided. I'm working to adapt your CCCSBOGPDMMCCCSATBYSECTOR7ANATDD V4.c (Cascaded DN2540 wi .......
165: Bottlehead Forum, I Meant "Mmmm... Forbidden Donut!" (0.00)
Posted by Dr Deville on 2004-10-30, 13:02:48 (68.32.213.214)
Though your subject line amused me too. Thanks for the cool ideas and advice. Best, George Ferguson .......
166: Bottlehead Forum, Re: walwart ? (0.00)
Posted by Dr Deville on 2004-10-30, 13:00:07 (68.32.213.214)
Hey Burke, Just to help out, IIRC, your can either use a 12V wart and leave your tubes' filament connection as is, or use a 6V wart and change the tubes' filament connections to the current (har) 6V c .......
167: Bottlehead Forum, PS Excellent Tagline, Douglas! :^) nt (0.00)
Posted by Dr Deville on 2004-10-29, 21:58:08 (68.32.213.214)
short, and wistful. .......
168: Bottlehead Forum, V3.0: Foreplay Gain Stage Bypass (Unity Gain) Switch (0.00)
Posted by Dr Deville on 2004-10-29, 21:52:51 (68.32.213.214)
Greetings, Fellow Hollowphile, In my neverending quest to compete with the Japanese here's the next generation, 2 hours after the previous one. When pondering V2, it occured to me that the grid-stop r .......
169: Bottlehead Forum, V2.0: Foreplay Gain Stage Bypass (Unity Gain) Switch (0.00)
Posted by Dr Deville on 2004-10-29, 20:15:42 (68.32.213.214)
Greetings Bottleheads, Thanks to Douglas and Jim, I now know what those resistors on VoltSecond's Mod 1 are for: keeping the input impedance high with the gain stage bypassed. So here's an updated ide .......
170: Bottlehead Forum, I've Replaces The Blade Twice And The Handle Three Times... (0.00)
Posted by Dr Deville on 2004-10-29, 12:08:12 (68.32.213.214)
...best axe I've ever had! Hey Douglas, I like your suggestions. As I ponder them, it seems that a good solution might be to build two individually optimized stages, gain and cathode follower, and RC .......
171: Bottlehead Forum, Ah! Lowered Load Impedance Presented To The Source (0.00)
Posted by Dr Deville on 2004-10-29, 11:51:02 (68.32.213.214)
Hey Douglas and Jim, Thanks for your thoughts and suggestions. I should have known you'd be here, Douglas! :^) Thanks for the heads up on loading down the source. As I ponder, it seems to me that ra a .......
172: Bottlehead Forum, Foreplay Gain Stage Bypass (Unity Gain) Switch (0.00)
Posted by Dr Deville on 2004-10-28, 21:13:41 (68.32.213.214)
Greetings Fellow Bottleheads, You may remember that, thanks to all your help, I built a Foreplay about a year ago. Emboldened by my success and joy, I embarked on a number of DIY projects, none of whi .......
173: Digital Drive, Tubed Dac Power Supply & CCS Stuff (0.00)
Posted by Dr Deville on 2004-10-28, 15:59:14 (68.32.213.214)
I've seen the kitsrus stuff before. The 78xx series regulators should get the job done nicely also. The kitsrus board would have to be modified anyway if you want to consider using a choke. That's wh .......
174: Digital Drive, Tubed Dac Power Supply Stuff (0.00)
Posted by Dr Deville on 2004-10-28, 00:13:10 (68.32.213.214)
Here is a pretty good starting point for the LM317: Ah, excellent tutorial-thanks! To approach it from a slightly different direction, I found the following kit at Circuit Specialists: http://kitsrus .......
175: Planar Speaker Asylum, Agreed: Building One Changed My Life (nt) (0.00)
Posted by Dr Deville on 2004-10-27, 23:38:00 (68.32.213.214)
Not a religious experience, but close. .......
176: Tube DIY Asylum, Ah, Good Point! Look For DC Spec. (0.00)
Posted by Dr Deville on 2004-10-26, 20:36:04 (68.32.213.214)
Thanks Brian! So Gary, I guess you'd want to find out (specs or test) the DC current they'll pass before saturation. Perhaps you could use it late in a CLCLC filter chain, where it doesn't have to pas .......
177: Digital Drive, I Love It When A Plan Comes Together... (0.00)
Posted by Dr Deville on 2004-10-26, 16:45:02 (68.32.213.214)
Hey John, Thanks--good stuff! The LM317 based PS sounds good--I can tweak it, and hide it in my Foreplay chassis. Any links to example LM317 circuits? I am a complete novice on opamps, though familiar .......
178: Tube DIY Asylum, Choke 'Em? (0.00)
Posted by Dr Deville on 2004-10-26, 01:19:55 (68.32.213.214)
Hey Gary, How about just using them as chokes, say in a nice PS filter? My apologies if this idea is moronic, due to exceeding the trannie's voltage limit or something. Best, George "I'm Not Happy Unt .......
179: Digital Drive, Wrap That Rascal... (0.00)
Posted by Dr Deville on 2004-10-26, 01:10:26 (68.32.213.214)
...the AC lead, that is. Hey John, Thanks for the helpful info and suggestions! I didn't notice a delay. :^) Please don't trouble yourself with the schematic. That 1.7V to 2V you were measuring out o .......
180: Planar Speaker Asylum, DEQX? (drool) Do They Make A Tube Version? ;^) (0.00)
Posted by Dr Deville on 2004-10-24, 20:41:37 (68.32.213.214)
Hey Tim, a single SS should produce 106-112dB of 15Hz-16Hz in my venue. Rockin' good news! ;^) If you go the DEQX route, please post your experiences. As you said, Hemholtz sure likes his. I'd love to .......
181: Planar Speaker Asylum, The PC-Ultra (0.00)
Posted by Dr Deville on 2004-10-24, 14:01:10 (68.32.213.214)
Hey Tim, I'm eyeing the PC-Ultra (powered cylinder) rather than the SS (passive cylinder). Though awesome, the SS is more than I'm willing to pay for. (I won't say "more than I need", because I can't .......
182: Tube DIY Asylum, Thanks Michael (0.00)
Posted by Dr Deville on 2004-10-24, 12:44:33 (68.32.213.214)
Hey Michael, Thanks for your thoughts! I guess it depends upon one's definition of "HV". I too have a scope for troubleshooting, oscillation, RFI, etc. For this application, I'm also looking for a so .......
183: Tube DIY Asylum, I'll Let You Know! (0.00)
Posted by Dr Deville on 2004-10-24, 12:24:03 (68.32.213.214)
Hey Serus, I already have the Audigy2 and, with inmates' help, am constructing a buffer that will match levels, protect the soundcard from HV, and provide a 1M input impedance for compatibility with s .......
184: Tube DIY Asylum, One Comment: It's Spelled "Stoetkit" :^) nt (0.00)
Posted by Dr Deville on 2004-10-24, 11:53:52 (68.32.213.214)
FWIW, HTH, YMMV, NAL. .......
185: Tube DIY Asylum, Thanks Jim, Very Informative. nt (0.00)
Posted by Dr Deville on 2004-10-24, 11:48:52 (68.32.213.214)
Just a note of appreciation. .......
186: Planar Speaker Asylum, You Just Gotta Ask Yourself... (0.00)
Posted by Dr Deville on 2004-10-23, 22:41:08 (68.32.213.214)
Hey AJ, Yep, it sounds like we are both frugal hedonists. :^) Appropriately, I am planning on an SVS subwoofer with my 3.6's--I've heard great things about them. With tri-amping, I can patch the subwo .......
187: Planar Speaker Asylum, I'm Using 'Em (0.00)
Posted by Dr Deville on 2004-10-23, 20:15:04 (68.32.213.214)
Hey AJ, I'm using the 1.6's for HT, and love them. One challenge for me was finding a center channel speaker of comparable quality for HT use. With the 1.6's being so nice, and HT having most of its s .......
188: Digital Drive, Foreplay With Nixon... (0.00)
Posted by Dr Deville on 2004-10-23, 12:40:21 (68.32.213.214)
...now there's a frightening image. ;^) Hey John, Thanks for sharing your experience--it seemed like a good idea, so I figured other folks are doing it. If you get stuck on your charging circuit, fee .......
189: Tube DIY Asylum, FWIW, The Audigy2 Has 24-bit AD, 96kHz. nt (0.00)
Posted by Dr Deville on 2004-10-22, 23:51:43 (68.32.213.214)
Just a data point. .......
190: Tube DIY Asylum, Well, All Righty Then! (0.00)
Posted by Dr Deville on 2004-10-22, 21:59:05 (68.32.213.214)
Hey Chad, Thanks for the advice and generous offer! This might be an efficient use of your time: What say I email you the design for the kit I've found? You could tell me what you think, and any chang .......
191: Digital Drive, Don't Forget Tubed DACs! (0.00)
Posted by Dr Deville on 2004-10-22, 19:20:34 (68.32.213.214)
Hey Bromo, Tubed DACs are another alternative, and can be a cheap path to aural fun. They can be quite reasonably priced, and offer the option of augmenting your existing player, comparing tube to SS, .......
192: Tube DIY Asylum, Here's What I've Found So Far (0.00)
Posted by Dr Deville on 2004-10-22, 15:35:58 (68.32.213.214)
But I think I might be looking at product from this company for my next digital toy. But how do you plan to use it with tube voltages, without blowing it up? In case you haven't noticed, I'm curious .......
193: Tube DIY Asylum, Men!! Please Don't Fight!!! You're *All* Studs! ;^) nt (0.00)
Posted by Dr Deville on 2004-10-21, 17:52:42 (68.32.213.214)
Please delete along with the rest. :^) .......
194: Tube DIY Asylum, Fair Enough--Interface Design Help? (0.00)
Posted by Dr Deville on 2004-10-21, 17:50:23 (68.32.213.214)
Hey Serus, Thanks for the thoughtful analysis. I take your points, and agree with them: * An internal soundcard may not deliver 100dB s/n in a PC's interference-riddled innards. *100dB s/n is not ne .......
195: Tube DIY Asylum, Are You Sure? Check Out Gary's Site (0.00)
Posted by Dr Deville on 2004-10-21, 13:20:16 (68.32.213.214)
Hey Serus, Thanks for the reply. It seems to me that Gary Pimm was able to get pretty good S/N with his internal card. If you care to take a look, I'd enjoy hearing your assessment of his results: htt .......
196: Tube DIY Asylum, Re: Funny You Should Mention That, Gary... (0.00)
Posted by Dr Deville on 2004-10-20, 21:43:07 (68.32.213.214)
:^D ...because I have been wanting to try it out, and have been symied by the HV-to-Soundcard interface needed to protect the soundcard from tube-type voltages. I saw you overcame this problem to som .......
197: Tweakers' Asylum, You Could Put Shrink Tube Over The Whole Thing (nt) (0.00)
Posted by Dr Deville on 2004-10-20, 10:46:26 (68.32.213.214)
Just a thought. .......
198: Tube DIY Asylum, Re: Not Obviously Flawed? Cool! (0.00)
Posted by Dr Deville on 2004-10-20, 00:23:25 (68.32.213.214)
Thanks Par, I'm thrilled that there is nothing obviously wrong with that approach. Of course, how it sounds will be another matter. I take your point about simplicity being a plus. I'm just laying out .......
199: Tube DIY Asylum, Re: Grid Leak Resistor Requirements Change (0.00)
Posted by Dr Deville on 2004-10-20, 00:15:08 (68.32.213.214)
Hey William, You're very welcome--I'm pleased to help. You don't sound like you're having any problem with tube runaway but, just for your information, the grid leak resistance includes your 150K resi .......
200: Tube DIY Asylum, Fleming! What do I win? :^D (nt) (0.00)
Posted by Dr Deville on 2004-10-20, 00:02:28 (68.32.213.214)
Sorry, the flesh is weak. .......
201: Tube DIY Asylum, Re: Grid Leak Resistor Requirements Change (0.00)
Posted by Dr Deville on 2004-10-18, 21:23:32 (68.32.213.214)
Hi William, As Poindexter et. al. pointed out, tubes are more likely to "run away" and self-destruct without the self-regulation of cathode bias. For that reason, you will find that the maximum permis .......
202: Tube DIY Asylum, Here's An Example (0.00)
Posted by Dr Deville on 2004-10-17, 18:47:38 (68.32.213.214)
Hi Folks, I agree that those are good questions. Here is an example (barring accidents) of the sort of arrangement JoelT suggested. I have adapted it to my CCS-fed configuration, and invite your comme .......
203: Tube DIY Asylum, Back On The Air, Yay! I Was Getting The Shakes... nt (0.00)
Posted by Dr Deville on 2004-10-17, 18:30:43 (68.32.213.214)
Gotta have my fix. .......
204: Tube DIY Asylum, Very, Very, Stupid Question, Deleted In The Nick Of Time! :^) nt (0.00)
Posted by Dr Deville on 2004-10-15, 22:58:29 (68.32.213.214)
Count your blessings! Even more stupid than usual! .......
205: Tube DIY Asylum, Cool Idea, Joel (0.00)
Posted by Dr Deville on 2004-10-15, 22:49:30 (68.32.213.214)
Hey Joel, I like the idea of taking to-grid feedback from the following stage's grid--no additional caps required! But how about replace the first stage's grid resistor with the pot's wiper and ground .......
206: Tube DIY Asylum, Thanks Folks! More Info, Local Feedback (0.00)
Posted by Dr Deville on 2004-10-15, 11:35:38 (68.32.213.214)
Thanks, Inmates! Here's a little more info: The stage in question drives paralleled KT90's (PPP) with 10% degenerative cathode feedback. With this CFB, I'm designing for a linear 180Vpp swing in the d .......
207: Tube DIY Asylum, 6SN7 Equivalent With Mu of Five? (0.00)
Posted by Dr Deville on 2004-10-15, 01:04:13 (68.32.213.214)
Greetings Inmates, Is there a tube comparable to the 6SN7 with a mu of about 5? Ideally it would have the same or better: * Base (though I'm flexible) * Filament voltage and current * parallel and .......
208: Planar Speaker Asylum, Oooh! Kinky! (0.00)
Posted by Dr Deville on 2004-10-14, 12:18:50 (68.32.213.214)
I feel batter ... :^) Apologies, George "Uhm, I'll Pass On The Pancakes, Mart" Ferguson .......
209: Tube DIY Asylum, Thanks Gary, Bas, Douglas! My Application (0.00)
Posted by Dr Deville on 2004-10-13, 23:41:18 (68.32.213.214)
Hey Guys, Thanks much! My particular application is as mu follower, 450V B+, feeding 8mA to a 6SN7 and driving parallel KT90's (PPP). Any recommendations for my case? Would battery-bias be worthwhile .......
210: Tube DIY Asylum, Thanks! What's The Motivation... (0.00)
Posted by Dr Deville on 2004-10-13, 12:10:01 (68.32.213.214)
... behind this variation, versus Pimm's. Simpler? Best, George Ferguson .......
211: Tube DIY Asylum, Functioning HP 3562A's are $1K Minimum on EBay, Gulp! (nt) (0.00)
Posted by Dr Deville on 2004-10-13, 12:03:18 (68.32.213.214)
Not cheap. .......
212: Tube DIY Asylum, I'm Investigating PC Soundcard Spectrum Analyzers (0.00)
Posted by Dr Deville on 2004-10-13, 11:52:57 (68.32.213.214)
Hey Tanker, FWIW, I'm investigating spectrum analyzer solutions that use software, your PC's soundcard, and a buffer between your soundcard and HV. I'd like a SA to look at harmonics, and correlate th .......
213: Tube DIY Asylum, Tube CAD Is Nice (0.00)
Posted by Dr Deville on 2004-10-13, 00:26:01 (68.32.213.214)
Hey Bequerel, As an uncompensated endorsement, I find Tube CAD quite helpful and educational in terms of calculating OPs, voltages, Zin, Zout, gain, Wplate, etc. I'm hoping that if I plug it enough, J .......
214: Tube DIY Asylum, Oooh! Daddy Likes! Douglas/Bas/Dave -- Any More Tips? (0.00)
Posted by Dr Deville on 2004-10-13, 00:21:05 (68.32.213.214)
Greetings Inmates, As I am scheming a CCS-Fed driver stage, I viewed the link with great interest. Can you point me to more info, or supply some? I'm wondering what prompted this variation, and how it .......
215: Tube DIY Asylum, Source for Chris Paul Output Impedance Paper (0.00)
Posted by Dr Deville on 2004-10-12, 17:00:27 (68.32.213.214)
Hi Mark, Thanks for your reply. I'm pondering this, and would like to look at the paper. Can you point me to it, email it, etc? Thanks! George Ferguson .......
216: Tube DIY Asylum, RDH Says... (0.00)
Posted by Dr Deville on 2004-10-11, 21:22:37 (68.32.213.214)
Greetings Inmates, Do not despair--my silence indicates study, not disinterest. RDH is like Ebay--whenever I think to look for something there, I find it. In this case "Voltage feedback from plate--r. .......
217: Tube DIY Asylum, Well, *MY* Opinion Is... Oh Wait, No One Cares. ;^) nt (0.00)
Posted by Dr Deville on 2004-10-11, 18:31:19 (68.32.213.214)
Except me. .......
218: Tube DIY Asylum, Examples Of Middle-Of-The-Road Audiophile Resistors? (0.00)
Posted by Dr Deville on 2004-10-07, 12:03:24 (68.32.213.214)
Greetings, Inmates and Inmatinas ;^) (As an aside, let me say how nice it is to have women among our "ranks".) The subject line may seem like an oxymoron, but I'm sourcing components for my first scra .......
219: Planar Speaker Asylum, Thanks Andy--I Wasn't Expecting That! ;^) nt (0.00)
Posted by Dr Deville on 2004-10-05, 10:47:38 (68.32.213.214)
Best, George Ferguson .......
220: Tube DIY Asylum, I Got 'Em--Thanks Dirk! nt (0.00)
Posted by Dr Deville on 2004-10-05, 10:42:48 (68.32.213.214)
Very interesting... .......
221: Tube DIY Asylum, Thanks Grover... (0.00)
Posted by Dr Deville on 2004-10-05, 00:45:53 (68.32.213.214)
...it's interesting to hear that the idea can work. Can you suggest any low-mu triodes? A double-triode, octal base, something like a low mu 6SN7 perhaps? In any case, thanks! Best, George Ferguson : .......
222: Tube DIY Asylum, Thanks Dirk! The Links Aren't Working Now, But I'll Keep Trying nt (0.00)
Posted by Dr Deville on 2004-10-05, 00:43:30 (68.32.213.214)
Thanks, though! .......
223: Tube DIY Asylum, Is A Volume Pot's Bandpass Effect Like Rg's--I.E. Minimal? (0.00)
Posted by Dr Deville on 2004-10-05, 00:36:46 (68.32.213.214)
Hey Mark and Damir, When I read your comments I knew I was wrong. Now, after further study, I think all three of us were wrong. :^) Going back to basic principles, (in this case Crowhurst's analysis o .......
224: Planar Speaker Asylum, Thanks For The Data, Mart--Very Interesting! nt (0.00)
Posted by Dr Deville on 2004-10-04, 23:12:17 (68.32.213.214)
Nothing to see here. .......
225: Planar Speaker Asylum, Transient Distortion, and Multi-Amping (0.00)
Posted by Dr Deville on 2004-10-04, 23:10:20 (68.32.213.214)
Hey Andy, Now we're having fun! Yes, good theoretical explanation. Thanks that's very... D'oh! Touche'! Let's see if I can come up with something a little more concrete. [an hour later] Okay, from an .......
226: Planar Speaker Asylum, Clipping May Not Be Obvious, And May Explain Preferences For Powerful/Tube Amps (0.00)
Posted by Dr Deville on 2004-10-04, 16:08:31 (68.32.213.214)
Hey Andy, Yep, we're on the same page now. I've never heard any sign that my amps clip. Not so fast, spurious-harmonics breath! ;^) The effect may be different than what you expect. Clipping may be de .......
227: Tube DIY Asylum, Very Helpful--Thanks! I'll Post Again, Post-Pondering, nt (0.00)
Posted by Dr Deville on 2004-10-04, 00:11:48 (68.32.213.214)
There's no explanation here. .......
228: Planar Speaker Asylum, Ab-sto-lutely! Those Links Are Great (0.00)
Posted by Dr Deville on 2004-10-03, 23:56:37 (68.32.213.214)
Hey Davey, I have both your and Mart's webpages safely copied on my own confuser. :^) Yes, I do want to recreate the original curves. By the way, I think your link on the MUG tweaks page is obsolete-- .......
229: Planar Speaker Asylum, Thanks Andy and Mart--Some Clarification (0.00)
Posted by Dr Deville on 2004-10-03, 23:56:14 (68.32.213.214)
Hey Andy, I think we're on the same page: I seriously recommend you stick to re-creating actively, the original passive crossover -3dB points and slopes. Thanks for the advice--I agree. It seems only .......
230: Planar Speaker Asylum, Thanks Hemholtz! (0.00)
Posted by Dr Deville on 2004-10-03, 23:28:36 (68.32.213.214)
Hey Hem, Those plots are so cool. All that data and tweakability looks very fun, and I know you like the sound. Rest assured, if my net worth goes up an order of magnitude, I'm buying one of those bab .......
231: Tube DIY Asylum, Here Come The Worms!!! (0.00)
Posted by Dr Deville on 2004-10-02, 22:31:26 (68.32.213.214)
Hey Mark, Thanks for sending your ideas: For starters you would need to have the NFB variable over a range of maybe 60dB. Yeah, you're right. That might not be feasible. For now, I'm considering the i .......
232: Tube DIY Asylum, Dump The Signal *After* The Stage? Hmmm... (0.00)
Posted by Dr Deville on 2004-10-02, 21:53:22 (68.32.213.214)
Hey John, Thanks for the comments: The feedback does alter the input impedance dramatically, more than the pot does. How so? I was thinking vaguely that, since local feedback sometimes lowers output i .......
233: Tube DIY Asylum, Why Not Control Gain With Local NFB, Instead Of A Grid-Ground Potentiometer? (0.00)
Posted by Dr Deville on 2004-10-02, 19:05:31 (68.32.213.214)
Greetings Inmates. Please correct me if I am wrong, but it seems to me that a gain-controlling grid-ground potentiometer does only bad things for performance--it messes with Zin and the effective valu .......
234: Planar Speaker Asylum, Tri-Amp 3.6r : Individual Panel High Frequency Rolloff? (0.00)
Posted by Dr Deville on 2004-10-02, 15:54:52 (68.32.213.214)
Greetings Inmates, As I continue my slow progress towards my scheme of tri-amped 3.6r's, I'm pondering the above-band response characteristics of the bass and mid panels. Can anyone tell me how they r .......
235: Tube DIY Asylum, Sounds Like More Than Bias Problems... What's Your Design? (0.00)
Posted by Dr Deville on 2004-10-02, 14:44:34 (68.32.213.214)
Hey H, Though my understanding is shallow, it seems that you are having more than bias problems. "Motorboating" can indicate low frequency instability, sometimes caused by excessively large grid leak .......
236: Tube DIY Asylum, The Big Picture (0.00)
Posted by Dr Deville on 2004-10-02, 12:26:21 (68.32.213.214)
Hey Stewen, I'm rather partial to Vanderveen/Plitron products, since I'm building an amp with their transformers. That said, I suggest you--or someone you trust--look at the overall design before chan .......
237: Tube DIY Asylum, Please Let Me Know What Happens :^) nt (0.00)
Posted by Dr Deville on 2004-10-01, 11:22:52 (68.32.213.214)
nt .......
238: Planar Speaker Asylum, I Take Your Point (0.00)
Posted by Dr Deville on 2004-10-01, 00:54:57 (68.32.213.214)
Hey Andy, Agreed that, all else equal, its best to avoid throwing extra components in the signal path. I just wanted to make sure I understood crossover theory (a little bit). Interesting data point .......
239: Planar Speaker Asylum, Thanks Davey--I'd Missed Your Link (0.00)
Posted by Dr Deville on 2004-09-30, 22:04:02 (68.32.213.214)
Hey Davey, Thanks for the very useful link. Its now safely saved on my confuser as a pdf. I'll study it, and probably pester you later. ;^) I like the idea of making a hybrid active/passive filter inc .......
240: Planar Speaker Asylum, Please Permit Me To Reveal My Crossover Ignorance... (0.00)
Posted by Dr Deville on 2004-09-30, 21:52:42 (68.32.213.214)
Hey Andy, Thanks for the info, though I don't yet understand. Please forgive me if the following questions are based on (extreme) ignorance. A cap in series with a tweeter is a 6dB, 1st order filter. .......
241: Tube DIY Asylum, 1.1V Bias on Second Stage? That Sounds Too Low (0.00)
Posted by Dr Deville on 2004-09-30, 21:23:36 (68.32.213.214)
Hey HDS, FWIW, an amp can be PP and Class A. Is yours SE? Anyway, if you have 1.1V bias on the second stage, that sounds way too low. Line level is about 1.4Vpeak so, even without any gain in the fir .......
242: Tube DIY Asylum, I'm Reading and Pondering--Many Thanks Allen, Douglas, and Pedroskova nt (0.00)
Posted by Dr Deville on 2004-09-30, 16:53:19 (68.32.213.214)
nt .......
243: Tube DIY Asylum, Tube-CAD! Thanks Dirk, and John Broskie (0.00)
Posted by Dr Deville on 2004-09-30, 16:51:14 (68.32.213.214)
Ah, excellent tip Dirk--thanks. I'm going to just go ahead and read Tube Cad from one end to the other. Many times when I have one of these questions, insights and answers turn up there. Let's hope we .......
244: Planar Speaker Asylum, Yep! Thank Goodness Their Speakers Are So Fine ;^) (0.00)
Posted by Dr Deville on 2004-09-30, 16:44:36 (68.32.213.214)
Hey Andy, Yes, agreed on the unhelpful attitude. When I asked this person (who shall remain nameless) about issues with Maggies in small rooms he said: "If you want to get rid of room problems, get he .......
245: Planar Speaker Asylum, Power-On Thumps and Tri-Amped Tweeters: That's What Caps Are For? (0.00)
Posted by Dr Deville on 2004-09-30, 14:55:03 (68.32.213.214)
Greetings Inmates, I'm working towards tri-amped 3.6's too (building amps now), and have pondered this problem. I discussed tri-amped 3.6's with someone at Magneplanar, and he said it was a bad idea b .......
246: Tube DIY Asylum, Google On "Audio Classroom" -- Indespensible Articles nt (0.00)
Posted by Dr Deville on 2004-09-30, 10:16:26 (68.32.213.214)
Thank me later! .......
247: Tube DIY Asylum, Stupid Plate Feedback / E-Linear Questions (0.00)
Posted by Dr Deville on 2004-09-29, 22:07:22 (68.32.213.214)
Greetings, Fellow Worshippers At The Thermionic Temple, I'd like a little guidance in local feedback technique--namely E-linear, plate-to-grid, CCS-to-grid, etc. I'm looking to cut my amp's voltage ga .......
248: Tube DIY Asylum, Fascinating Captain... (0.00)
Posted by Dr Deville on 2004-09-28, 22:42:09 (68.32.213.214)
This degradation of CCS drive performance with increasing bias current, is it true of all CCSs, or just the ones you mentioned? Regards, George "Scotty" Ferguson .......
249: Tube DIY Asylum, Inspiring! Thanks Pete. My Little Plan... (0.00)
Posted by Dr Deville on 2004-09-28, 22:36:26 (68.32.213.214)
Hey Pete, I read your post in the Bottlehead forum, and enjoyed it. I'm in a boring phase--bogey design finished, and picking out all the little nit-picky little bits that a first time from-scratch bu .......
250: Tube DIY Asylum, Hale Fellow Cathode Feedbacker, Well Met (0.00)
Posted by Dr Deville on 2004-09-28, 19:09:22 (68.32.213.214)
The output stage is EL34/KT88/Ei90 etc. (triode or UL) and, with cathode feedback from the OT, I'll need close to 70V of drive. Oooh... hello again! :^D Coincidentally, I am doing the same. What are .......
251: Tube DIY Asylum, Donning William Shatner Voice: "But *Why*?" (0.00)
Posted by Dr Deville on 2004-09-28, 18:59:54 (68.32.213.214)
Well, you probably cut the outpt of the mu-follower in half too when you doubled its current Hey Douglas, Could you explain what you mean by "output", and why it is cut in half? Best, George "Mouth B .......
252: Planar Speaker Asylum, Because They're So Popular--Do An Archive Search (nt) (0.00)
Posted by Dr Deville on 2004-09-28, 10:07:07 (68.32.213.214)
nt .......
253: Hi-Rez Highway, Thanks Ken--Works With Multichannel Formats? (0.00)
Posted by Dr Deville on 2004-09-28, 09:54:56 (68.32.213.214)
Hey Ken, Thanks for the reply--yes it did help. Just to clarify, both players were adept at generating a phantom center when in hi-rez (SACD/DVD-A) mode? And thanks for the comments on their sound. I .......
254: Tube DIY Asylum, I Think Muddy Waters Did The Original Version (nt) (0.00)
Posted by Dr Deville on 2004-09-27, 22:51:15 (68.32.213.214)
Sorry, I couldn't help it. .......
255: Tube DIY Asylum, Let's Make A Deal... (0.00)
Posted by Dr Deville on 2004-09-27, 22:45:59 (68.32.213.214)
...I'll give you my novice insights, if you tell me the details of your CCS (I need one for my 6SN7 driver stage, and am thinking SS for the voltage swing I need.) Anyway, here are my thoughts, presen .......
256: Planar Speaker Asylum, Are You Crazy (Like Me), Or A Fool? :^) (0.00)
Posted by Dr Deville on 2004-09-26, 11:40:31 (68.32.213.214)
Hey V, I'm planning to upgrade my 1.6's to 3.6's in a similarly sized room. But then again, I am insane. Of course the 3.6's would sound better in a larger room, but I'm betting they'll sound better .......
257: Hi-Rez Highway, An Analog Mixer For Phantom Center Channel--I Like It! (0.00)
Posted by Dr Deville on 2004-09-26, 11:05:12 (68.32.213.214)
Hey Graemme, Thanks for the thoughtful and helpful reply. I like your analog mixer idea, and am imagining a little box that would sit between the player and the preamp, and mix three channels into two .......
258: Hi-Rez Highway, Thanks Again Martin--Very Helpful (nt) (0.00)
Posted by Dr Deville on 2004-09-26, 10:57:41 (68.32.213.214)
no text .......
259: Tube DIY Asylum, Thanks Douglas--Live Long And Radiate (nt) (0.00)
Posted by Dr Deville on 2004-09-26, 00:46:07 (68.32.213.214)
Tubes is purdy. .......
260: Hi-Rez Highway, Thanks Martin! Opinions Of 3910 And 2910? (0.00)
Posted by Dr Deville on 2004-09-25, 15:51:00 (68.32.213.214)
Thanks Martin, That is just the sort of info I seek--clearly there is a difference between having a "phantom center" menu option, and doing it correctly. It seems the 2900 and 5900 have been supercee .......
261: Hi-Rez Highway, Phantom Center Channel Option For Hi-Rez (SACD/DVD-A) Multichannel Playback? (0.00)
Posted by Dr Deville on 2004-09-25, 12:28:38 (68.32.213.214)
Hi All, I hope this is the right forum for my question--I received no response in the Digital forum, so I've moved here. (Original deleted--no cross-posting) :^) I'm pondering the purchase of a Univer .......
262: Tube DIY Asylum, How To Make $50K From Custom Audio: Invest $100K ;^) (0.00)
Posted by Dr Deville on 2004-09-25, 11:14:25 (68.32.213.214)
Hey Jimmy, Economics' major criteria for evaluating a venture's profitability are "Competitive Advantage" and "Barriers To Entry". Competitive advantage means having something the other guy's haven't- .......
263: Tube DIY Asylum, Voltsecond Is Indeed A Fine Resource--Here's Another (0.00)
Posted by Dr Deville on 2004-09-24, 17:00:56 (68.32.213.214)
Hi Pastito, You could do a lot worse than following Voltsecond's advice--following mine, for example. ;^) Here's another link to a wealth of information, including the different types of volume contro .......
264: Tube DIY Asylum, Promising Link--Thanks Dirk! (0.00)
Posted by Dr Deville on 2004-09-24, 11:09:39 (68.32.213.214)
RD-- It seems that there's more to that circuit than initially meets the eye. I can't yet evaluate the link's content on technical grounds, but I believe MJ Magazine has a good reputation, and it look .......
265: Tube DIY Asylum, WAG Ho! (0.00)
Posted by Dr Deville on 2004-09-23, 23:21:02 (68.32.213.214)
Hey RD, WAGs are welcome. And I'm just the man for the job. I'll jump in, and give you my novice impressions in hopes you find them useful, or others correct me. If that wasn't enough of a disclaimer, .......
266: Tube DIY Asylum, TubeCAD? I Love It! (0.00)
Posted by Dr Deville on 2004-09-23, 15:02:29 (68.32.213.214)
Hey Russ, Your kind words are gentle rain to the desert of my ego. ;^) I bought TubeCAD reluctantly, because I was happily drawing loadlines by hand at the time. But a friend recommended it and I want .......
267: Tube DIY Asylum, D'oh!! Thanks! :^) Revised Calculations (0.00)
Posted by Dr Deville on 2004-09-23, 12:10:34 (68.32.213.214)
Hey Russ, Thanks for the kind words--I'm glad you took my comments in the spirit that I offered them. you mentioned doing your tube cad stuff with a 12AT7 and the original post used a 12AX7 Ooops! Wel .......
268: Planar Speaker Asylum, Thanks! nt (0.00)
Posted by Dr Deville on 2004-09-23, 11:38:48 (68.32.213.214)
nt .......
269: Planar Speaker Asylum, Revel In Your Freedom (0.00)
Posted by Dr Deville on 2004-09-23, 11:31:19 (68.32.213.214)
Hey DR, Well, wouldn't you know it, a local shop has a pair that would run same as the B&G ribbons. You consider this a problem ? ;^) Now I am all messed up!!! Cool! Confusion offers growth. Would I g .......
270: Tube DIY Asylum, No Offense or Sarcasm Intended--Just Trying To Help nt (0.00)
Posted by Dr Deville on 2004-09-23, 11:12:50 (68.32.213.214)
George "Not Perfect" Ferguson .......
271: Tube DIY Asylum, Thanks For The Useful Review! Irony Alert! (0.00)
Posted by Dr Deville on 2004-09-23, 01:40:40 (68.32.213.214)
Hey ShiFtY, Thanks for the clear review--you described your test situation clearly, allowing readers to come to their own conclusions. As a newbie, I found your experience ripe for pondering. What cou .......
272: Tube DIY Asylum, By Hand? That's Dedication! Thanks Jose! nt (0.00)
Posted by Dr Deville on 2004-09-22, 21:52:18 (68.32.213.214)
no text here .......
273: Tube DIY Asylum, Thanks For The Photos--Perf Plate Source? (0.00)
Posted by Dr Deville on 2004-09-22, 10:44:44 (68.32.213.214)
Hey Jose, Thanks for the photos. Can you recommend any sources for the perforated plate you used? I'd like to use some, and have not found a reasonably priced vendor. Best, George Ferguson ::: TOPIC: .......
274: Tube DIY Asylum, Thanks Russ--When I'm In S Florida, The Beer's On Me! nt (0.00)
Posted by Dr Deville on 2004-09-22, 10:38:41 (68.32.213.214)
Beer... ahhh....... .......
275: Tube DIY Asylum, Thanks Guys, For The Helpful Advice! nt (0.00)
Posted by Dr Deville on 2004-09-21, 23:37:43 (68.32.213.214)
nt .......
276: Tube DIY Asylum, Is A 2.5" Greenlee Punch Really $143? (0.00)
Posted by Dr Deville on 2004-09-21, 16:53:28 (68.32.213.214)
Greetings Inmates, I will eventually need to punch some 2.5" holes for some nifty oil-run caps, and the best price I could find on a Greenlee was $143, IIRC! Is that as cheap as the big 'uns get? For .......
277: Tube DIY Asylum, Re: You're right .... (0.00)
Posted by Dr Deville on 2004-09-21, 14:19:13 (68.32.213.214)
Hey Steven, Ignoring the low signal to noise of some posters ... I salute you! Thanks for the reminder of the 6SL7 -- I had forgotten how linear it is. I might almost be able to replace two 6SN7 stage .......
278: Tube DIY Asylum, Thanks Mike! Tube Versus Transistor Mu Stage? (0.00)
Posted by Dr Deville on 2004-09-20, 23:44:36 (68.32.213.214)
Hey Mike, So some like the lower tube's output eh? Interesting. Any opinion on a tubeless Gary Pimm CCS versus Alan Kimmel's pentode-based version? The Pimm appeals for its low power and voltage drop- .......
279: Tube DIY Asylum, I Reached Him! Strip the x's and .'s From The Email Addy nt (0.00)
Posted by Dr Deville on 2004-09-20, 11:37:50 (68.32.213.214)
No Text .......
280: Tube DIY Asylum, I'd Like A "Sound Practices" Source Too (0.00)
Posted by Dr Deville on 2004-09-19, 23:16:30 (68.32.213.214)
It sounds interesting. I see a site under construction at soundpractics.com , but no content or contact info. It makes perfect sense that the Internet would spark a renaissance in thermionics, just a .......
281: Planar Speaker Asylum, Buck Up GL--Your Heart Will Go On. Har! nt (0.00)
Posted by Dr Deville on 2004-09-19, 20:38:25 (68.32.213.214)
nt .......
282: Planar Speaker Asylum, A Maggie And Head Sandwich (0.00)
Posted by Dr Deville on 2004-09-19, 11:06:21 (68.32.213.214)
are you saying 6 inches or 6 feet? (please say feet) "Feet" ;^) It seems both my reason and my typing are impaired. Ah, but what's an apostrophe between friends? :^D> Sorry about the confusion, thoug .......
283: Planar Speaker Asylum, How Crazy Are You? (0.00)
Posted by Dr Deville on 2004-09-18, 19:34:12 (68.32.213.214)
Hey Craig, I sit about 6" from my 1.6's and love the sound-- until I get my 3.6's, that is. Of course, I am (happily) insane. YM(and sanity)MV. Best, George Ferguson .......
284: Planar Speaker Asylum, You Need Stinking Notches (0.00)
Posted by Dr Deville on 2004-09-18, 15:41:05 (68.32.213.214)
Hey DR, As you probably already know, your ribbon's resonance is at 5KHz to 6KHz, which is well above the MMG's crossover frequency. Drat. Too bad the manufacturer couldn't design them for flat respon .......
285: Tube DIY Asylum, The Student Is The Teacher Is The Student (0.00)
Posted by Dr Deville on 2004-09-18, 15:31:10 (68.32.213.214)
I was making an attempt at dry humor too, perhaps too dry. Nope, and the humor is always appreciated. It just goes to show how easy it is to misunderstand, especially when physical cues are missing. .......
286: Planar Speaker Asylum, Best Of Both Worlds (0.00)
Posted by Dr Deville on 2004-09-18, 11:54:35 (68.32.213.214)
Hey Mike, If forced to choose I'd go for the 3.6, because then I'd have a speaker with greater potential, and could upgrade my other equipment over time. But that's just me. But maybe you don't have t .......
287: Planar Speaker Asylum, Re: Notches!? Do We Need Any Stinking Notches? (0.00)
Posted by Dr Deville on 2004-09-17, 19:34:23 (68.32.213.214)
I would love a room to support 3.6s triamped. I just don't have the room,or the budget for the 3rd amp. Neither do I. ;^) Anyhow, see the link, and the manufacturer's recomended crossovers. Maybe if .......
288: Planar Speaker Asylum, Notches!? Do We Need Any Stinking Notches? (0.00)
Posted by Dr Deville on 2004-09-17, 16:49:41 (68.32.213.214)
Hey DR, Building your own amp!! Now that sounds like fun!! Oh it is! As much as I can handle! ;^) Any idea about the notch filter?? I'm afraid I'm not familiar with it. If you describe it, perhaps I .......
289: Planar Speaker Asylum, An Attempt At Actually Answering Your Question... (0.00)
Posted by Dr Deville on 2004-09-17, 11:51:05 (68.32.213.214)
Hey DR, Sometime's a fellow's gotta take the road less travelled, even if it means tradeoffs, right? I understand--I am learning tube design so that I build my own design, tailored to 3.6s. It is far .......
290: Tube DIY Asylum, I'm Concerned That The Signal Is Not Pure Feedback (0.00)
Posted by Dr Deville on 2004-09-17, 10:54:11 (68.32.213.214)
Hey Grover, Thanks for joining the conversation! Any sort of negative feedback would reduce noise, wouldn't it? I believe so. My concern in this case is that the signal is not pure negative feedback. .......
291: Tube DIY Asylum, A beginner's Answer about mu-followers (0.00)
Posted by Dr Deville on 2004-09-17, 10:37:29 (68.32.213.214)
Hi SomeJoe, The archives will provide you with plenty of references. Here are some overall ideas that may help you make sense of them. The lower tube supplies voltage gain, in an ideal manner because .......
292: Tube DIY Asylum, I Have Concerns About Single-Ended PSRR... (0.00)
Posted by Dr Deville on 2004-09-17, 00:33:03 (68.32.213.214)
Hey Kataparokhi, I'm concerned about that plate-to-grid connection feeding power supply noise right into the grid. Actually, I believe the author talked about excessive noise, and reducing it by filte .......
293: Tube DIY Asylum, No Worries! (0.00)
Posted by Dr Deville on 2004-09-16, 20:55:45 (68.32.213.214)
Hey Douglas, Thanks for the reassurance. My comment was meant in humor and acknowledgement--I do tend to ask a lot of questions! I try to maintain a good attitude, though I'm often frustrated at how s .......
294: Tube DIY Asylum, You BAS..., Er, I Mean, Thank You Sir, May I Have Another? ;^) nt (0.00)
Posted by Dr Deville on 2004-09-16, 19:17:17 (68.32.213.214)
no text here .......
295: Tube DIY Asylum, Ah Ha! Plate Feedback! (0.00)
Posted by Dr Deville on 2004-09-16, 14:18:39 (68.32.213.214)
Hey Kataparokhi, Thanks for the interesting article. I too am intrigued with the plate feedback as a sound-enhancing method of reducing gain, as opposed to a simple attenuator, which degrades input & .......
296: Tube DIY Asylum, Plates and Channel Iron (Aluminium, Actually) (0.00)
Posted by Dr Deville on 2004-09-16, 13:56:26 (68.32.213.214)
Hi Steve, I have to concur with others that bending a box may not be the best way to go. Here are two alternatives to consider: 1. The basic top plate on a nice wood base, a la Bottlehead. Douglas's s .......
297: Tube DIY Asylum, An Offering To Those Wiser Than I (0.00)
Posted by Dr Deville on 2004-09-15, 22:56:54 (68.32.213.214)
Howdy Inmates, Each of you knows much more than I do about thermionics. Please accept these observations with the respect with which I offer them: 1. The only courtesy we can decide is our own. 2. Fre .......
298: Tube DIY Asylum, (Mouth Hanging Open, Drool Running Down Chin...) (0.00)
Posted by Dr Deville on 2004-09-15, 22:23:42 (68.32.213.214)
Hey Damir, Thanks, though at the moment I'm at a loss to figure Ua for an Ultralinear PP setup. D'oh! Perhaps after I do some more studying? :^) say -25...-60V Now that I understand. ;^) Best Regards .......
299: Tube DIY Asylum, Thanks Dave--I'm Waiting For A Reply Back On Soundcard-To-Instrument Info Request (0.00)
Posted by Dr Deville on 2004-09-15, 17:19:08 (68.32.213.214)
Hey Dave, Thanks for the endorsement. Do you use the 216? We're thinking alike--I'm going to get an analog scope anyway, for supra-audio RF and oscillation troubleshooting. I want a PC scope as an eco .......
300: Tube DIY Asylum, Thanks Russ--It Sounds Like External Venting Would Save Energy (0.00)
Posted by Dr Deville on 2004-09-15, 16:56:08 (68.32.213.214)
Within 6 inches I'd say it would be close to hot enough to burn you. I am running EL34's in class AB1. You can reach across the top of the amp okay but you wouldn't want to linger. If I had a wood sh .......
301: Tube DIY Asylum, I Always Have To Google On "Audio Classroom" To Find It (0.00)
Posted by Dr Deville on 2004-09-15, 00:06:04 (68.32.213.214)
Hey Beat, You are very welcome! Be sure to stock up on caffeine and ibuprofen--your brain is going to be throbbing. And least mine was... and still is. It amazes me how quickly the consequences of rel .......
302: Tube DIY Asylum, Recommended Readings (0.00)
Posted by Dr Deville on 2004-09-14, 20:23:25 (68.32.213.214)
Hi Beat, You could start with AudioXpress's online version of Crowhurst (et. al)'s marvelous Audio Classrom series: http://www.audioxpress.com/resource/audioclass/ Get some your favorite caffeinated b .......
303: Tube DIY Asylum, Fixed Bias Voltage Range for 6550 / KT88 / KT90 ? (0.00)
Posted by Dr Deville on 2004-09-14, 17:08:06 (68.32.213.214)
Greetings Inmates, Could wise and kindly souls please give me an idea of the voltage range required for fixed bias of 6550 / KT88 / KT90 ? I'm designing a spiffy bias bridge, and want to optimize its .......
304: Tube DIY Asylum, Hot Air Outside Versus Inside--Air Around Amps 20 Degrees Hotter? (0.00)
Posted by Dr Deville on 2004-09-14, 14:42:09 (68.32.213.214)
Man, I am really threadjacking! Well, at least its a thread I started. I'd say you could count on the room with the stereo being a good 5 to 10 degrees warmer than other removed rooms Thanks for the c .......
305: Tube DIY Asylum, Pondering Room-Cooling Options... (0.00)
Posted by Dr Deville on 2004-09-14, 10:39:23 (68.32.213.214)
carry on of course! Thanks--it's good to have partners in obsession. :^) but be warned, as you lift this Iron Well, I'm building them as monoblocks, but they still promise to be mighty hefty. Perhap .......
306: Tube DIY Asylum, Smokin'! (0.00)
Posted by Dr Deville on 2004-09-13, 16:19:23 (68.32.213.214)
you do realize that you are going to have one hell of a heater here All too well. My guesstimate is 300W/monoblock. And when I biamp... ...did I tell you that I live in Tucson? But hey, if I wanted e .......
307: Tube DIY Asylum, Cap On Wiper--Thanks Douglas! (0.00)
Posted by Dr Deville on 2004-09-13, 11:15:23 (68.32.213.214)
Don't forget a cap between the wiper and ground...perhaps a 10 uF oil cap? it is for a final filtering and in case the pot gets noisy. That sounds like a good idea. Thanks! Best, George Ferguson ::: .......
308: Tube DIY Asylum, Hot, Multi-Tube Action!!! (0.00)
Posted by Dr Deville on 2004-09-13, 10:35:13 (68.32.213.214)
Hey George, Here we go... (strapping in) Douglas: >>How about lowering your B+ from 450V to 350V, for compatibility with 6550? George: Isn't 450V fine for 6550? I am speaking of a 100-120 mA idle cu .......
309: Tube DIY Asylum, Gaffes, big chokes, and Cathode Feedback (0.00)
Posted by Dr Deville on 2004-09-12, 22:07:36 (68.32.213.214)
Thanks for your interest. No, thank you! ;^) Yeah, I'm right there with you on having to relearn stuff that I already learned once--it soaks in slow, and evaporates easy. I recently did that with th .......
310: Tube DIY Asylum, From Unbalanced to Balanced (0.00)
Posted by Dr Deville on 2004-09-12, 21:57:43 (68.32.213.214)
split phase first then. (snip) common cathode( not grounded cathode SE ), are PP and have excellent PSRR just like the PP power stage. That certainly seems like a good idea, and I see that a number o .......
311: Tube DIY Asylum, Any Opinions on This PC Soundcard Spectrum Analyzer Hardware and Software? (0.00)
Posted by Dr Deville on 2004-09-12, 17:27:22 (68.32.213.214)
I have sitting before me a computer with massive processing power and an Audigy2 card with 24-bit/96kHz ADC sittin idle. Of course it needs hardware to protect the soundcard from high voltage, and spe .......
312: Tube DIY Asylum, Fair Enough--I'm Just Thinking About Trading Gain for *Better* Sound (nt) (0.00)
Posted by Dr Deville on 2004-09-12, 15:58:33 (68.32.213.214)
nt .......
313: Tube DIY Asylum, No! That's Just What They'd Be Expecting!!! (nt) (0.00)
Posted by Dr Deville on 2004-09-12, 15:56:58 (68.32.213.214)
nt .......
314: Tube DIY Asylum, Oh, God Yes! (0.00)
Posted by Dr Deville on 2004-09-11, 20:41:13 (68.32.213.214)
(in William Shatner voice) Must... build... nixie... clock... Count me in. Do you sell the PC boards? Can you steer me to a nice source of nixies? (eBay?) That looks like an excellent way to warm up t .......
315: Tube DIY Asylum, Re: Good Ways To Tweak An Amplifier Design's Gain? (0.00)
Posted by Dr Deville on 2004-09-11, 20:34:12 (68.32.213.214)
HEY-Hey!!! Howdy Douglas, Thanks for your reply--it is as thought-provoking as usual. I consider it a badge of honor that I now understand most of what you are saying, or at least think it do. How 'f .......
316: Tube DIY Asylum, Thanks Damir--Maybe I'll Try More Cathode Feedback (0.00)
Posted by Dr Deville on 2004-09-11, 14:34:21 (68.32.213.214)
Well, George - you liked 6SN7 and now you must pay for it:-) Guilty as charged! ;^) Maybe I'll look around and see if I find a dual triode with 10 mu and curves that I like as well as the 6SN7. It's .......
317: Tube DIY Asylum, Plate to Grid NFB Consideration (0.00)
Posted by Dr Deville on 2004-09-11, 12:15:35 (68.32.213.214)
For example, would plate-to-grid NFB reduce the PSRR, coupling more PS noise into the signal? Just a thought. Best, George Ferguson .......
318: Tube DIY Asylum, Good Ways To Tweak An Amplifier Design's Gain? (0.00)
Posted by Dr Deville on 2004-09-11, 12:05:02 (68.32.213.214)
Greetings Fellows, I'm looking to tweak an amplifier design's gain to better integrate with my other components. My question is this: If a body is happy with an amplifier design's tubes, topology, and .......
319: Planar Speaker Asylum, Exceptional (0.00)
Posted by Dr Deville on 2004-09-11, 10:41:19 (68.32.213.214)
I am thinking of making an exception and going for a Parallel Push Pull KT90 Tube amp to drive the Maggies. Hey TubeBear, Great minds think alike. ;^{)> I'm building myself a custom PPP KT90 amp, opt .......
320: Planar Speaker Asylum, Expensive Does Not Equal Profitable (nt) (0.00)
Posted by Dr Deville on 2004-09-10, 23:03:06 (68.32.213.214)
nt .......
321: Tube DIY Asylum, The Blind Leading The Blind... (0.00)
Posted by Dr Deville on 2004-09-10, 22:56:17 (68.32.213.214)
Hi Dave, For what they're worth, here are my novice ponderings on the issue, presented in hopes that they might help you, and that someone will step in and correct me if I am wrong. To reiterate, thes .......
322: Tweakers' Asylum, Ah! The 4960 or Samsung 841! Thanks Guys! (0.00)
Posted by Dr Deville on 2004-09-09, 21:43:10 (68.32.213.214)
Davet and Fatcobra, Thanks for the info--I was just beginning to think I had posted in the wrong forum. You tip looks very promising. I had missed the 4960/841. I don't care about 5-disc carousel, so .......
323: Tweakers' Asylum, Does The Toshiba 6915 (DVD-A/SACD) Have Potential Like The 3950 / 3960 ? (0.00)
Posted by Dr Deville on 2004-09-09, 16:55:47 (68.32.213.214)
Greetings, I have read the threads on the Toshiba 3950 / 3960 with great interest. I'd like a player with high-res format compatibility (SACD and DVD-A), and I see Toshiba's 6915 offers that, and is a .......
324: Tube DIY Asylum, I'm Building A Gary Pimm CCS Mu-Stage Fed 6SN7 Driver (0.00)
Posted by Dr Deville on 2004-09-09, 10:48:29 (68.32.213.214)
I'd like to see MuStageFan's schematic too. In the meantime, Google for Alan Kimmel and/or Mu Stage Philosophy to find Kimmel's article--one host site seems to be down, temporarily I hope. Have fun! B .......
325: Tube DIY Asylum, PC Soundcard Scope / Analyzer -- Hardware and Software Resources? (0.00)
Posted by Dr Deville on 2004-09-09, 10:30:49 (68.32.213.214)
Thanks Arend-Jan and Dave, Your suggestions for a soundcard-based solution is appealing. After all, I have an Audigy2 card sitting idle in my PC, with 24-bit AD and DA converters. I noticed on Gary Pi .......
326: Tube DIY Asylum, Excellent Tip--Thanks John! (nt) (0.00)
Posted by Dr Deville on 2004-09-09, 10:24:56 (68.32.213.214)
No text here. .......
327: Tube DIY Asylum, Re: Enough already!!!! (0.00)
Posted by Dr Deville on 2004-09-08, 19:29:26 (68.32.213.214)
So how 'bout we get back to DIY on a nice friendly basis, OK? Sounds like an excellent idea! So, what would you have me do? allow somebody to speard wrong information w/o calling attention to it? .......
328: Tube DIY Asylum, Whether Or Not You Did Before, You Certainly Don't Now... (0.00)
Posted by Dr Deville on 2004-09-08, 10:16:30 (68.32.213.214)
have a wife, children, or pets, that is. :-D Thanks for the cool photo. I find it oddly inspiring. Best, George "Come Up To The Lab And See What's On The Slab" Ferguson .......
329: Tube DIY Asylum, Thanks Jim! S/N, Etc? (0.00)
Posted by Dr Deville on 2004-09-07, 19:29:03 (68.32.213.214)
Hey Jim, I appreciate your comments--here and in the archives. The Velleman's price is right, but I don't see any S/N noise or ADC bit-depth specs in their information. I'm thinking that I'll need ple .......
330: Tube DIY Asylum, Better PC Scope / Spectrum Analyzer than Pico Tech. ADC-216 (0.00)
Posted by Dr Deville on 2004-09-07, 15:56:30 (68.32.213.214)
Hi Folks, I have a question for those taking a breather from the Ohm's Law cage match. ;-) I'm about to pull the "trigger" (scope pun) on a PC oscilloscope, and am wondering if anyone has any insights .......
331: Inmate Systems, Dr Deville's DIY Dream Under Construction: Multi-Amped Tubes and Magnepans (0.00)
Posted by Dr Deville on 2004-09-05, 10:54:16 (68.32.213.214)
Audio Asylum Inmate Dr Deville's DIY Dream Under Construction: Multi-Amped Tubes and Magnepans System
Audio Asylum Inmate Dr De .......
332: Tube DIY Asylum, Got My 100uF ASCs Too! (0.00)
Posted by Dr Deville on 2004-09-04, 10:51:45 (68.32.213.214)
Hey DH, I just received my ASCs too--a case of the 100uF jobbies, and the box still had a Japanese label on it. : ) The transaction was a breeze, and the price good. Now I'm one more step closer to cr .......
333: Tube DIY Asylum, 100uF ASC Cap Source (0.00)
Posted by Dr Deville on 2004-09-04, 10:43:49 (68.32.213.214)
Hi RD, As other's have already mentioned, I got mine from: http://stores.ebay.com/Capacitor-and-Craft-Farm_W0QQsspagenameZl2QQtZkm I am completely satisfied with the transaction, and have no relations .......
334: Tube DIY Asylum, Nice Mounts For the Round 2.5"-ers (0.00)
Posted by Dr Deville on 2004-09-03, 10:55:14 (68.32.213.214)
Thanks DJL, These mounts look perfect for the 100uF ASCs I bought, due to arrive today: http://meci.com/Catalog/Item/720f5c47-eb7f-41f3-abbc-17e791b3c2fa Best, George Ferguson .......
335: Tube DIY Asylum, Yep, I Use TubePad Too (nt) (0.00)
Posted by Dr Deville on 2004-09-02, 10:20:52 (68.32.213.214)
no text .......
336: Planar Speaker Asylum, Tubes and Maggies Can Change Your Life (0.00)
Posted by Dr Deville on 2004-08-31, 18:21:33 (68.32.213.214)
I really did hear an ARC/Magneplanar system in the 1970s that to this day is in my top 3 all-time systems Relax Yada, I believe you. : ) Yes, it was during the 70s that I had my own Maggies-and-Tubes .......
337: Planar Speaker Asylum, Don't Stop Now!!! ;-) (0.00)
Posted by Dr Deville on 2004-08-30, 16:42:28 (68.32.213.214)
You're very welcome. But there's glass on the side walls as well. Then, put curtain rods on the side walls as well, and damp those first-order reflections! I ran curtain rods around my room's entire p .......
338: Planar Speaker Asylum, I'm Definitely Nuts (0.00)
Posted by Dr Deville on 2004-08-30, 10:21:13 (68.32.213.214)
Hi Jane (nice handle), I have my Maggies in a similarly small room, and love them. Proper wall treatments are crucial, IMO. As soon as I finish building my self-designed tube amps and crossover, I'm s .......
339: Planar Speaker Asylum, One Thought (0.00)
Posted by Dr Deville on 2004-08-30, 10:06:38 (68.32.213.214)
my 3.3's don't like all the glass. I'm selling and going to try Martin Logan CLS, which I understand will work well with my REL sub, though I remain open to suggestion....Any thoughts? Yes, drapes! G .......
340: Tube DIY Asylum, Triad Chokes? (0.00)
Posted by Dr Deville on 2004-08-30, 09:49:17 (68.32.213.214)
where do I buy chokes that work well for choke input supplies that don't cost a fortune. Hey John, I have my eye on some Triads at Allied for my own PS, on the bottom of this page: http://www.alliede .......
341: Tube DIY Asylum, The Voltage Is Less, But It Hz Just As Much (0.00)
Posted by Dr Deville on 2004-08-29, 22:55:32 (68.32.213.214)
Just to get completely wacky, what about something like Jon Risch's power conditioner, with values adjusted for lower voltage? It seems that the principle is the same. I suppose judicious shielding an .......
342: Tube DIY Asylum, Me Four! Thanks John M, Et Al (0.00)
Posted by Dr Deville on 2004-08-29, 20:37:25 (68.32.213.214)
Show me the oilers! :D I just went and ordered a case of the caps from the source JohnM mentioned. That should be enough to do my present monoblocks, and my next project too (barring accidents ;) Best .......
343: Tube DIY Asylum, The Usual Reason... (0.00)
Posted by Dr Deville on 2004-08-29, 20:30:28 (68.32.213.214)
that's why I don't build *ANYTHING* but choke input power supply. That stuff gets everywhere, and instead of trying to filter it out, why not just *NOT* create it in the first place? Hey Douglas, Vo .......
344: Tube DIY Asylum, Gizmo Said It Best... (0.00)
Posted by Dr Deville on 2004-08-29, 09:56:10 (68.32.213.214)
Hey Adkins, Check out Dr. Harvey "Gizmo" Rosenberg's article: http://www.meta-gizmo.com/Tri/4w/Plitron4W.html He presents they whys and wherefores, along with a heaping helping of good will. This arti .......
345: Tube DIY Asylum, Thanks Douglas! (nt) (0.00)
Posted by Dr Deville on 2004-08-28, 17:12:37 (68.32.213.214)
nooooo text. .......
346: Tube DIY Asylum, Approx. 1uF ASC Oilers--Part Numbers? (0.00)
Posted by Dr Deville on 2004-08-28, 16:15:35 (68.32.213.214)
Hi Douglas, Thanks for the recommendation. I've asked before, but I'm still puzzling over which particular ASC caps you are referring to in the 1.5uF size? Looking at Allied, I see oilers (X386S, X38 .......
347: Tube DIY Asylum, 100uF ASC Polypropylene-in-oil caps? Where? (0.00)
Posted by Dr Deville on 2004-08-25, 23:09:53 (67.167.156.58)
Hi Chris, Thanks for the report. Where can I find the 100uF ASCs? 60 is the largest I have seen. I have my eye on some 60uF 470V ASCs for about $13/ea from AlliedElec Thanks for the info, and happy li .......
348: Tube DIY Asylum, Yep, I Was Geeking Out. (0.00)
Posted by Dr Deville on 2004-08-22, 11:43:42 (67.167.156.58)
Think of this discussion as fishing for different things to try, not a way to come to a final design. Hey Dave, Fair enough--I was becoming a bit obsessed with my newfound tools. Thanks again for t .......
349: Tube DIY Asylum, Re: welllllll (0.00)
Posted by Dr Deville on 2004-08-21, 23:29:22 (67.167.156.58)
Hey Douglas, Plate-to-Grid NFB... what a cool idea! Can you point me to any discussion and analysis of same? (I've read the E-linear threads.) I wonder if it would reduce the effects of Miller Capacit .......
350: Tube DIY Asylum, Tubes Don't Kill Music, *Loadlines* Kill Music (0.00)
Posted by Dr Deville on 2004-08-21, 23:23:40 (67.167.156.58)
Hey Joel, I agree that the most linear plate curves are useless unless one takes advantage of them with crafty loadlines. My CCS-loaded driver stage design is similar to what you suggest--I'm using 8m .......
351: Tube DIY Asylum, Re: No Substitute For Studying The Plate Curves? (0.00)
Posted by Dr Deville on 2004-08-21, 23:17:08 (67.167.156.58)
> A perfectly linear device would have a constant mu at all plate current points. Hey Joel, I agree. In our imperfect reality, it seems to me that the best one can do is to select a loadline that pas .......
352: Tube DIY Asylum, You're Right--The 6BX7 Cga Is Around 4.4pF (0.00)
Posted by Dr Deville on 2004-08-21, 22:50:23 (67.167.156.58)
Hey Damir, You're right--I got my 10.5pF from TubeCAD, but the data sheets say 4.2 or so. Here's my OP for the gainstage (using 6SN7 for all examples below): To my eyes, if one draws a line from (300V .......
353: Tube DIY Asylum, Thanks Dave--Comparing Operating Points (0.00)
Posted by Dr Deville on 2004-08-21, 22:36:30 (67.167.156.58)
Hey Dave, Thanks for the suggestions--is your gainstage OP around 110V/5mA? B+ around 350V? Looking at the plate curves, linearity looks good along that load line but, to these admittedly novice eyes, .......
354: Tube DIY Asylum, No Substitute For Studying The Plate Curves? (0.00)
Posted by Dr Deville on 2004-08-20, 22:52:40 (67.167.156.58)
Hi Andy, Thanks for sharing your thoughts and experiences. > I've tried for a split of thirds in the concertina - a third of the B+ on the anode, a third on the cathode and a third across the valve. A .......
355: Tube DIY Asylum, It Was Fun To Study the 6BX7 (0.00)
Posted by Dr Deville on 2004-08-20, 22:45:41 (67.167.156.58)
Hey Damir, Thanks for the 6BX7-GT suggestion. You picked a very nice operating point--constant amplification to within my limits of curve-reading. :-) I had fun playing with its loadlines and simulati .......
356: Tube DIY Asylum, Loadlines, Distortion, & Tube Type (0.00)
Posted by Dr Deville on 2004-08-20, 14:32:31 (67.167.156.58)
> George, you can't really go by the published plate curves, as they don't represent a cathode degenerative amplifier. If you mean that the published curves don't take into account the effect of dege .......
357: Tube DIY Asylum, Thanks Jimmy--That Sounds Very Fun (nt) (0.00)
Posted by Dr Deville on 2004-08-20, 11:58:59 (67.167.156.58)
No Text here. .......
358: Tube DIY Asylum, Isolation Transformer, And Good Practices (0.00)
Posted by Dr Deville on 2004-08-20, 11:38:51 (67.167.156.58)
Hi Furry (and others who have inquired about shocks), An AC isolation transformer can float your bench & equipment with respect to ground, and might save your life if you happen to touch something hot .......
359: Tube DIY Asylum, Feedback Back (0.00)
Posted by Dr Deville on 2004-08-20, 11:18:04 (67.167.156.58)
>Maybe a decoupling cap will "destroy" less than alternative mending... Good point. It would certainly be simpler than providing a higher B+. >I'm not to sure feedback is a "mend all" cure, but I thin .......
360: Tube DIY Asylum, Ah--Good Point! Thanks Joel (nt) (0.00)
Posted by Dr Deville on 2004-08-20, 11:04:59 (67.167.156.58)
No Text here. .......
361: Tube DIY Asylum, Thanks Damir--6SN7 Cathodyne Alternatives? (0.00)
Posted by Dr Deville on 2004-08-20, 11:03:47 (67.167.156.58)
Hey Damir, Thanks for the suggestions--I'll try out your operating points. Can you suggest any tubes you think would be superior to the 6SN7 in my application? My preferences are: * Low distorion (e .......
362: Tube DIY Asylum, Does Unity Gain Imply Low Distortion? (0.00)
Posted by Dr Deville on 2004-08-19, 22:37:23 (67.167.156.58)
Fellow Inmates, The following question has been nagging at the back of my mind, and now has specific relevance to my design: Does unity gain in a voltage stage, through degenerative feedback, imply lo .......
363: Tube DIY Asylum, Found One (0.00)
Posted by Dr Deville on 2004-08-19, 10:41:29 (67.167.156.58)
Here's a round Simpson analog meter with range 0-1.5V model 08850: http://www.simpsonelectric.com/pdf/webpdfe/Round VDC.pdf I think it would do the trick. However, at $75/ea I am tempted to just insta .......
364: Tube DIY Asylum, Excellento. Thanks For Your Patience Russ. : ) (nt) (0.00)
Posted by Dr Deville on 2004-08-18, 22:10:21 (67.167.156.58)
Nothing to see here. Please move along. .......
365: Tube DIY Asylum, Re: Followup Questions: The Next Generation (0.00)
Posted by Dr Deville on 2004-08-18, 11:46:52 (67.167.156.58)
Hey Russ, Thanks for the info--I'm learning lots. I guess I'm guilty of treadjacking, but at least its a thread I started. ;) >So surf around his [John Risch's] website for lots of good ideas from bal .......
366: Tube DIY Asylum, Thanks Russ--And Now, My Inevitable Followup Questions (0.00)
Posted by Dr Deville on 2004-08-17, 23:39:58 (67.167.156.58)
Thanks Russ, I've just had fun researching Jon Risch's filter. Thanks for the tip. Have you had good experiences with it? Regarding your xformer suggestion, yes I am indeed in the US (Tucson). Please .......
367: Tube DIY Asylum, Re: Synchronicity--I'm Looking For A 1V Round Analog Meter Too! (0.00)
Posted by Dr Deville on 2004-08-17, 15:12:21 (67.167.156.58)
I've been clicking around meterdistributor.com, but so far the lowest range round analog meters I've found are 10V. I need 1V max. Best, George Ferguosn .......
368: Tube DIY Asylum, Re: Here's Another Torroid Application--AC Isolation (0.00)
Posted by Dr Deville on 2004-08-16, 21:50:04 (67.167.156.58)
Here is another option--isolate and balance the AC going to *all* your treasured gear: http://www.hometheaterhifi.com/volume_10_3/feature-article-isolation-transformer-8-2003.html I'm packaging one wi .......
369: Tube DIY Asylum, Re: Output Stage PS Ripple Less Critical? Groovy! (0.00)
Posted by Dr Deville on 2004-08-16, 15:07:29 (67.167.156.58)
> If you want to add capacitance, do it after the choke or even further down the line. In PP outputs hum will generally cancel in the output stage. Add your capacitance to the driver and front end sup .......
370: Tube DIY Asylum, Re: One Newbie To Another (0.00)
Posted by Dr Deville on 2004-08-16, 11:11:13 (67.167.156.58)
Hi Sott, I'll try to help here, with the hope that wiser folks will intervene if I lead you astray. >From what you are telling me, if I want I can increase the capacitance values in the power supply f .......
371: Tube DIY Asylum, Re: Fair Enough (0.00)
Posted by Dr Deville on 2004-08-13, 13:35:21 (67.167.156.58)
I'm using the chokes in capacitor-input filters, and will keep my fingers crossed. I'll also stock up on rubber washers. ;-) Thanks Henry, George Ferguson .......
372: Tube DIY Asylum, Re: Got 'Em! (0.00)
Posted by Dr Deville on 2004-08-13, 11:35:47 (67.167.156.58)
Hi Damir, I got through to your site and copied your photos. They indeed provide layout ideas. But where are the pink and yellow filament wires? ;o)> Thanks! George Ferguson .......
373: Tube DIY Asylum, Re: So Triad Chokes Are Okay? (0.00)
Posted by Dr Deville on 2004-08-13, 10:14:17 (67.167.156.58)
Henry Said: > Power supply is choke-input using Triad 10H @ 200mA, 150 Ohm chokes. Are Triad chokes okay in PS filters? I'm eyeing some on Allied Electronics for my first abomination, er, amp. Best, G .......
374: Tube DIY Asylum, Re: Still No Response From TubeBuilder (0.00)
Posted by Dr Deville on 2004-08-13, 10:08:12 (67.167.156.58)
Thanks for the email addys John. I've sent messages to all of them, but still no reply. I hope this is just a temporary glich. Best, George Ferguson .......
375: Tube DIY Asylum, Re: Rockin' Good News! :^D) (nt) (0.00)
Posted by Dr Deville on 2004-08-12, 20:15:27 (67.167.156.58)
Nothing to see here. Move along. .......
376: Tube DIY Asylum, Re: Thanks John, I'll Try These Emails (nt) (0.00)
Posted by Dr Deville on 2004-08-12, 10:07:12 (67.167.156.229)
Still no reply yet. .......
377: Tube DIY Asylum, Re: one mo' thing... (0.00)
Posted by Dr Deville on 2004-08-11, 13:54:14 (66.82.170.53)
Hey Douglas, Thanks for the tips. I take your point that even a transformer that is robust for AC filaments might load down on a rectifier-to-cap's large charging surges. I'll ponder the difference in .......
378: Tube DIY Asylum, Re: Thanks Russ--Very Helpful. (nt) (0.00)
Posted by Dr Deville on 2004-08-11, 13:21:08 (66.82.170.53)
Nothing to see here. .......
379: Tube DIY Asylum, Re: Thanks Francois--I Must Be Misusing PSUD (nt) (0.00)
Posted by Dr Deville on 2004-08-11, 13:19:41 (66.82.170.53)
Nothing to see here. .......
380: Tube DIY Asylum, Re: Photo Link Broken? (0.00)
Posted by Dr Deville on 2004-08-11, 09:55:23 (66.82.170.53)
Hey Damir, Thanks again! I tried your photo link: http://damir.webizlog.com and it came up broken. Am I doing something wrong? Best, George Ferguson .......
381: Tube DIY Asylum, Re: Thanks All--Just What I Needed! (0.00)
Posted by Dr Deville on 2004-08-10, 22:19:50 (66.82.170.53)
Hi Folks, Thanks for taking the time to educate me. Your posts gave me what I wanted--an idea of the overall tradeoffs and specific considerations of DC filament supplies. Now I'm more confident that .......
382: Tube DIY Asylum, Re: Thanks Jimmy! 0.55V Drop Schottskys? (0.00)
Posted by Dr Deville on 2004-08-10, 22:01:07 (66.82.170.53)
Hey Jimmy, Thanks again--the sort of hard-won experience that folks like you share boosts both my knowledge and my spirits. If it isn't too much trouble, could you share a part # and retail source for .......
383: Tube DIY Asylum, Re: Schottsky Forward Drop, Can't get 6.3Vdc Out of PSUD (0.00)
Posted by Dr Deville on 2004-08-10, 19:03:15 (66.82.170.53)
Hey Francois, Thanks for your tips--I'm having fun so far. ; ) What is the forward voltage drop for Schottskys? From their spec sheet I'm getting about 2V--is that right? And if that is true, doesn't .......
384: Tube DIY Asylum, Re: Haven't Heard Back--What Email? (0.00)
Posted by Dr Deville on 2004-08-10, 18:38:09 (66.82.170.53)
Hey John, Could you tell me what email addy you used? I have'nt heard back from TubeBuilder yet, and wonder if I used the wrong email. Best, George Ferguson .......
385: Tube DIY Asylum, Re: Thanks Damir! Yes Toroids, Loops Around Tubes? (0.00)
Posted by Dr Deville on 2004-08-10, 18:08:27 (66.82.170.53)
Yes, you are correct that I am using Plitron torroids for both power and output transformers. Your wiring tips confirm what I already heard, and went straight into my "cheat sheet". : ) It's helpful t .......
386: Tube DIY Asylum, Newbie DC Filament Power Supply Questions (0.00)
Posted by Dr Deville on 2004-08-10, 10:20:54 (66.82.170.53)
Hi All, As I continue the endlessly entertaining and educational process of designing my first amp, I am now pondering the value and difficulty of DC filament power. Here are my particulars: With 3 6S .......
387: Tube DIY Asylum, Thanks John! I Sent TubeBuilder An Email. (nt) (0.00)
Posted by Dr Deville on 2004-08-09, 14:06:51 (66.82.170.53)
Move along. Nothing to see here. .......
388: Tube DIY Asylum, Schottky Diode Sources (0.00)
Posted by Dr Deville on 2004-08-09, 12:18:35 (66.82.170.53)
Howdy Folks, Can you recommend a current source (har!) for 600V Schottky diodes? Searching the archives shows TubeBuilder as a source, but I don't see them there, and some of that site's links are bro .......
389: Tube DIY Asylum, Bottlehead Ditto (0.00)
Posted by Dr Deville on 2004-08-08, 14:36:43 (66.82.170.53)
Not only are the kits cheap, quality, and euphonic, but the forum is priceless. If you avail yourself of all the info it and its members offer, you will be a happy advanced-novice. Best, George Fergus .......
390: Tube DIY Asylum, Re: Thanks VS for the Useful Comments and Link! (nt) (0.00)
Posted by Dr Deville on 2004-08-08, 14:20:39 (66.82.170.53)
Nothing to see here, move along. .......
391: Tube DIY Asylum, Re: Nice Photos! (0.00)
Posted by Dr Deville on 2004-08-08, 09:58:21 (66.82.170.53)
Thanks for the photos. Can you tell me more about the angle "iron" in there? Are you using it as terminal strips? Best, George Ferguson .......
392: Tube DIY Asylum, Thanks Ray! Examples/sources? (0.00)
Posted by Dr Deville on 2004-08-07, 21:39:27 (66.82.170.53)
Thanks Ray, This newbie appreciates your guidance. Could you give some specific examples and sources, especially for the buss bar? That would help me get my bearings. Best, George Ferguson ::: TOPIC: .......
393: Tube DIY Asylum, Here's The Schematic, I Hope (0.00)
Posted by Dr Deville on 2004-08-04, 20:45:36 (66.82.170.53)
Okay, here's the schematic: http://home.comcast.net/~gkf/CcsFedConcertina1a.GIF I hope it comes through. The triodes are halves of a 6SN7, and the layout and component values are from a configuration .......
394: Tube DIY Asylum, I'll Try To Post A Schematic (0.00)
Posted by Dr Deville on 2004-08-03, 18:58:03 (66.82.168.1)
Hey Dave, Yes, whether or not a CCS fed Concertina is a good idea, I'd enjoy understanding it. The design I got from TubeCAD is a standard Concertina, with another triode between it and B+ acting as a .......
395: Tube DIY Asylum, Ah Ha!, Noise Considerations for Line Level Concertina (0.00)
Posted by Dr Deville on 2004-08-03, 10:49:55 (66.82.168.1)
Thanks Henry, I think you've solved my riddle. The revised -phase load that TubeCAD suggests is indeed the same value as the cathode resistor--seemingly doing what you suggest to restore balance. It l .......
396: Tube DIY Asylum, Implications of Putting The Concertina First (0.00)
Posted by Dr Deville on 2004-08-02, 10:26:57 (66.82.168.170)
Hi Jeff, Thanks for offering your constructive criticism--it gives me the chance to learn by pondering and explaining. Actually, my philosophy seems to be similar to yours-- optimize stages for their .......
397: Tube DIY Asylum, Thanks All! So If I Understand... (0.00)
Posted by Dr Deville on 2004-08-02, 09:36:37 (66.82.168.170)
Then the reason no one talks about hanging a resistor on a Concertina's lower-Zout leg to match impedances is, its simply not necessary? : ) Thanks to all for bothering to educate me, and for being so .......
398: Tube DIY Asylum, Alternative: Standard (non CCS) Concertina and Regulated B+ (0.00)
Posted by Dr Deville on 2004-08-01, 17:27:32 (66.82.168.1)
Hey Eli, Thanks for the suggestion, and another idea to ponder. : ) Can you point me towards a simple-yet-effective regulation circuit? I'm still hoping someone will comment on my "add impedance to th .......
399: Tube DIY Asylum, Concertina ( Split Load ) Output Impedance Considerations, CCS Fed and Otherwise (0.00)
Posted by Dr Deville on 2004-08-01, 13:48:05 (66.82.168.1)
Greetings Veteran Tubophiles, I have a question about Concertina output impedance matching in general, and for my CCS-fed version in particular. Before getting into the specifics, here is my general q .......
400: Tube DIY Asylum, Re: Ditto, Thanks! (nt) (0.00)
Posted by Dr Deville on 2004-07-19, 22:50:29 (68.32.213.214)
Nothing here. .......
401: Tube DIY Asylum, Count Your Blessings... (0.00)
Posted by Dr Deville on 2004-07-19, 22:34:07 (68.32.213.214)
Hi All, Boy, I just came within a mouse-click of posting a reeeeeeeeeeeally stupid question. Fortunately, as I finished writing it out, I realized my mistake. I think. ; ) So, as I learn, I may becomi .......
402: Tube DIY Asylum, Ah, Slow (Time Constant) Indeed! Thanks Henry! (nt) (0.00)
Posted by Dr Deville on 2004-07-14, 23:26:06 (68.32.213.214)
Nothing here. Really. .......
403: Tube DIY Asylum, Thanks UC--I Appreciate Your Auricap Recommendation. (nt) (0.00)
Posted by Dr Deville on 2004-07-14, 23:24:46 (68.32.213.214)
Move along. Nothing to see here. .......
404: Tube DIY Asylum, Thanks Gary--Very Helpful (nt) (0.00)
Posted by Dr Deville on 2004-07-14, 23:23:18 (68.32.213.214)
Nothing to see here. Move along. .......
405: Tube DIY Asylum, Thanks! Recs for Signal-Type Oil Caps in Metal Cans (0.00)
Posted by Dr Deville on 2004-07-14, 23:22:23 (68.32.213.214)
Thanks John and All, Your insights are very helpful, and sound like they come from experience. : ) I am using no global feedback, so that is not an issue. Now that you, Gary P, and Henry P mention it .......
406: Tube DIY Asylum, Thanks Russ, You Have Me Dead To Rights. : ) (nt) (0.00)
Posted by Dr Deville on 2004-07-14, 18:15:22 (68.32.213.214)
Nothing to see here. Move along. .......
407: Tube DIY Asylum, Oversized Coupling Caps--Any Significant Downside? (0.00)
Posted by Dr Deville on 2004-07-14, 16:27:46 (68.32.213.214)
Greetings Fellow Inmates, Another thread has me pondering this question: is there any significant downside to using inter-stage coupling caps with a much bigger capacitance than the design requires? A .......
408: Tube DIY Asylum, Many Thanks, Douglas. (nt) (0.00)
Posted by Dr Deville on 2004-07-14, 10:06:50 (68.32.213.214)
There is nothing to see here. Move along. .......
409: Tube DIY Asylum, Groovy--What Size Do You Use? (0.00)
Posted by Dr Deville on 2004-07-13, 19:32:52 (68.32.213.214)
>>>Yep, those are the ones, X386 and 387. Nice stuff. Hi Douglas, I'm wondering what size you use, and for what. As far as I can see, they come in sizes from 5uF to 60uF. Since my PS requires multip .......
410: Tube DIY Asylum, Polypropylene or Metallized Polypropylene? (0.00)
Posted by Dr Deville on 2004-07-13, 15:23:03 (68.32.213.214)
Hi Douglas, I believe I am looking at the sort of caps you recommend-- ASC s over at Allied Electronics: http://www.alliedelec.com/catalog/pf.asp?FN=978.pdf Is these indeed the type you like? I see in .......
411: Tube DIY Asylum, Polypropylene or Metallized Polypropylene? (0.00)
Posted by Dr Deville on 2004-07-13, 14:47:57 (68.32.213.214)
Hi Douglas, I believe I am looking at the sort of caps you recommend-- ASC s over at Allied Electronics: http://www.alliedelec.com/catalog/pf.asp?FN=978.pdf Is these indeed the type you like? I see in .......
412: Tube DIY Asylum, Re: Do Tubed CCSs Have A Greater Voltage Drop? (0.00)
Posted by Dr Deville on 2004-07-13, 10:01:57 (68.32.213.214)
Thanks Douglas! And won't a tubed CCS require more like 150V, for the drop across the tube and its associated resistors? Best, George Ferguson .......
413: Tubes Asylum, Mmm Mmm Good! Some Considerations (0.00)
Posted by Dr Deville on 2004-07-12, 14:12:17 (68.32.213.214)
Hey Dave, Maggies and tubes can change one's audio life--it did mine. Long long ago, hearing Tympanis bi-amped with Audio Research tubes left me forever transformed. Female voices hovered in the room, .......
414: Tube DIY Asylum, Thanks John--More Info (0.00)
Posted by Dr Deville on 2004-07-12, 09:59:59 (68.32.213.214)
Hi John, Thanks for your helpful response. It sure is nice to have companions on the journey. Yes, the output load is a bit deceptive-- its for paralleled (clutch the pearls!) KT90 's, each with 270 K .......
415: Tube DIY Asylum, Further Thoughts--Do Tubed CCSs Have A Greater Voltage Drop? (0.00)
Posted by Dr Deville on 2004-07-11, 16:28:36 (68.32.213.214)
Gary Pimm's design is my baseline, and I am wondering if there was a good tubed alternative. So far my impression is that tube CCSs require about a 200V-drop from input to output --which might be too .......
416: Tube DIY Asylum, Mu-Follower For 6SN7 : Specifics? (0.00)
Posted by Dr Deville on 2004-07-10, 10:40:03 (68.32.213.214)
Howdy Folks, Can you share specific recommendations/experiences for a mu-follower for a 6SN7 grounded-cathode voltage amplifier stage? I'm studying Allan Kimmel and Gary Pimm's articles, the circuit i .......
417: Tube DIY Asylum, (...sigh...) nt (0.00)
Posted by Dr Deville on 2004-06-25, 20:55:07 (68.32.213.214)
Move along, nothing to see here... .......
418: Tube DIY Asylum, Hey Gary--You Still Selling Your CCS Boards? (0.00)
Posted by Dr Deville on 2004-06-24, 23:30:14 (68.32.213.214)
Hi Gary, Could you contact me--email is fine--and let me know how to reach you? I've sent you some emails about your CCSs, but no joy. Thanks for the great website, and all the CCS info. I hope you ar .......
419: Tube DIY Asylum, It Just Isn't Fair! (0.00)
Posted by Dr Deville on 2004-06-24, 13:07:29 (68.32.213.214)
How come the Amplimo website's data sheets are so much prettier than Plitron's? Home court advantage? ; ) Best, George "Dreaming About Torroids And Huge Triodes" Ferguson .......
420: Tube DIY Asylum, Example... (0.00)
Posted by Dr Deville on 2004-06-24, 10:23:20 (68.32.213.214)
Plitron PAT-HQ5090 Handles 90w of SET goodness. .......
421: Tube DIY Asylum, Yep! (0.00)
Posted by Dr Deville on 2004-06-24, 10:14:27 (68.32.213.214)
What Bas said. Plitron make some fine ones. Well-designed and built torroids offer low stray fields and excellent bandwidth, at the expense of low DC saturation rejection. But DC capability can be inc .......
422: Tubes Asylum, Very Well Done Review--Thanks! (0.00)
Posted by Dr Deville on 2004-06-23, 15:02:55 (68.32.213.214)
Hi Ed, Thanks for the informative and interesting review. It was thorough, clear, useful, and the photos were very nice. :D Best Regards, George Ferguson .......
423: Tube DIY Asylum, Voltsecond Has Played With It (0.00)
Posted by Dr Deville on 2004-06-10, 11:29:29 (68.32.213.214)
Try: http://www.siteswithstyle.com/VoltSecond/K-12M_AMP/K-12M_Push_Pull.html Beware of scorching tube sockets--an early problem that they may or may not have fixed. Best, George Ferguson .......
424: Tube DIY Asylum, Safety Tip--Umbilical Controlled Disconnect Relay (0.00)
Posted by Dr Deville on 2004-06-10, 11:21:47 (68.32.213.214)
Thanks all for the good info. My own suggestion--use one umbilical lead to control a relay on the HV, switching it off if continuity is lost. No matter how nice the connector, I'd hate to think of wha .......
425: Tube DIY Asylum, Re: Wiring Tips to Minimize Noise--One More Tip (0.00)
Posted by Dr Deville on 2004-06-06, 17:15:49 (68.32.213.214)
Within the above constraints, try to keep your wires as far apart as possible, both when parallel and when crossing. For that reason, your photo's cable ties, though they do make things look neat, are .......
426: Tube DIY Asylum, Thanks Brian--It Looks Interesting and Informative! (nt) (0.00)
Posted by Dr Deville on 2004-06-06, 15:45:14 (68.32.213.214)
nt .......
427: Tube DIY Asylum, That's What I Figured (nt) (0.00)
Posted by Dr Deville on 2004-06-06, 15:14:50 (68.32.213.214)
nt .......
428: Tube DIY Asylum, Not Ready Yet... (0.00)
Posted by Dr Deville on 2004-06-06, 15:13:45 (68.32.213.214)
Hey Damir, Thanks for the reply and the tip-- Norman Koren's site, and PSpice certainly look useful and fascinating. For the time being, I have my hands full just learning the basics--figuring amplifi .......
429: Tube DIY Asylum, Wiring Tips to Minimize Noise (0.00)
Posted by Dr Deville on 2004-06-06, 12:54:03 (68.32.213.214)
"I could have assembled this thing twice in the time that I have spent pondering the layout." Perhaps, and, IMO, you have made the right choice. : ) I learned much about the issues you describe on the .......
430: Tube DIY Asylum, Thanks--*Build* it?!? What??! ; ) (0.00)
Posted by Dr Deville on 2004-06-06, 11:48:33 (68.32.213.214)
"but in my view/experience - just build the ... amp, then you`ll have something to listen to, to tweak, to measure, to calculate and compare to varius data, etc" Huh? What? Are you *insane*? ; ) Thank .......
431: Tube DIY Asylum, Voltage Gain of Vanderveen / Plitron Output Stage -- UL w/ Cathode Feedback (0.00)
Posted by Dr Deville on 2004-06-05, 16:04:09 (68.32.213.214)
Hello Fellow Inmates, For those who have not been taking notes, I'm designing an amp based on the Vanderveen / Plitron torroidal OT with Ultralinear and Cathode Feedback taps. (Yes, I'm a techno-wh*re .......
432: Tube DIY Asylum, Pico Link Regarding Bits and Dynamic Range (0.00)
Posted by Dr Deville on 2004-05-25, 10:01:15 (68.32.213.214)
Hey All, Here's a link on the Pico site about bits and performance: http://www.picotech.com/applications/resolution.html It seems to back up Allen's assertion. Comments? Look good? : ) Best, George Fe .......
433: Tube DIY Asylum, PC Oscilloscope : Opinions of Pico ACD-216? (0.00)
Posted by Dr Deville on 2004-05-25, 09:55:16 (68.32.213.214)
Hey Allen and All, Based on Allen's comments, I searched for 16 bit PC Oscilloscopes, and so far I have found the Pico ACD-216 . Here's a link: http://www.picotech.com/audio_spectrum_analyzer.html Ca .......
434: Tube DIY Asylum, Ah! Good To Know... (0.00)
Posted by Dr Deville on 2004-05-25, 09:36:50 (68.32.213.214)
Hey Allen, Thanks for the wisdom on dynamic range--that is just the sort of thing I am wondering about. Could you provide more info or a link to the SpecA/scope? I Googled, could not find it, and won .......
435: Tube DIY Asylum, PC Based Oscilloscopes and Test Gear (0.00)
Posted by Dr Deville on 2004-05-22, 21:54:58 (68.32.213.214)
Howdy Inmates, I have an idle laptop that I would like to make into an Oscilloscope/Function Generator/ Spectrum Analyzer/Distortion Measurer. I read Jim Doyle and others' posts on the Velleman and Bi .......
436: Tube DIY Asylum, You'll Be A Guru, And *Like* It!! ; ) (0.00)
Posted by Dr Deville on 2004-05-22, 13:10:05 (68.32.213.214)
(And Douglas too--Many Thanks!) Hi Damir, You're right, my prospective "preamp" (a Marchand XM126 Tube Crossover) will have plenty of gain (6dB), so I was being way too conservative in my gain require .......
437: Tube DIY Asylum, Please Instruct Me, Master Damir! ; ) (0.00)
Posted by Dr Deville on 2004-05-22, 10:41:32 (68.32.213.214)
Thanks very much Damir, for your continued suggestions and clarifications. >>IMO- 6SL7 is not the good option here (concertina) Could you please tell me why? It's not that I don't believe you, I just .......
438: Tube DIY Asylum, Cool! (0.00)
Posted by Dr Deville on 2004-05-21, 17:35:24 (68.32.213.214)
And very groovy! So, I figure I need an amplification of about 300, and Menno's design has about 500. So I may be able to throw some gain away and get lower distortion in the bargain. (Maybe remove th .......
439: Tube DIY Asylum, Just To Check My Comprehension... (0.00)
Posted by Dr Deville on 2004-05-21, 10:46:17 (68.32.213.214)
Thanks again Damir and Douglas, for taking the time to educate me. To see if I understand your calculation, does 87Vp/61.5Vrms represent the drive voltage required at the output tube's grid to drive t .......
440: Tube DIY Asylum, Re: Gain In Ultralinear With Cathode Feedback--Excellent! (0.00)
Posted by Dr Deville on 2004-05-20, 08:42:33 (68.32.213.214)
That's just the sort of approximation I was seeking. I'm reading, and learning. : ) Best, George Ferguson .......
441: Tube DIY Asylum, Why go higher gm, Especially in First Stage? (0.00)
Posted by Dr Deville on 2004-05-20, 08:40:19 (68.32.213.214)
Hi Douglas, Thanks for bringing that up! It gives me a chance to demonstrate my ignorance and ask, why higher gm, especially in the input/Concertina stage? I noticed that the 6SL7 has lower gm than th .......
442: Tube DIY Asylum, Many Thanks, All! (0.00)
Posted by Dr Deville on 2004-05-19, 22:57:44 (68.32.213.214)
Thanks for your friendly and helpful replies. I am pondering all of them, and appreciate your graciousness. You folks are totally tubular! Best, George Ferguson .......
443: Tube DIY Asylum, Plate-Curve Spacing Along The Loadline, and Harmonics (0.00)
Posted by Dr Deville on 2004-05-19, 22:53:29 (68.32.213.214)
Hey Jim, Although it did not specifically address my questions, your message was certainly useful. : ) If I recall correctly, one sort of irregularity in plate curves crossing the loadline results in .......
444: Tube DIY Asylum, Gain In Ultralinear With Cathode Feedback (0.00)
Posted by Dr Deville on 2004-05-19, 22:25:27 (68.32.213.214)
Hey Damir, Thanks for the info. Time to study, so that I can do my own gain calculations. : ) To check my work, can you tell me what the gain in in Ultralinear with Cathode Feedback configuration? I'm .......
445: Tube DIY Asylum, Amp Schematic, Does Your Gain Include the Cathode Feedback? (0.00)
Posted by Dr Deville on 2004-05-19, 10:54:08 (68.32.213.214)
Hi Damir, Yep, I'm working with the Vanderveen design you mentioned-- folks can take a look at it on page 4 of this link: http://www.plitron.com/PDF/PB/Article/Atcl_4.pdf Clearly I need to do the gain .......
446: Tube DIY Asylum, Lower Distortion Alternatives to 12AT7 & 12AU7 ? (0.00)
Posted by Dr Deville on 2004-05-18, 17:41:19 (68.32.213.214)
Hello Inmates, I'm building a cathode-feedback PPP amp, and am looking at tweaking the design of the input and driver stages. Because of the cathode-feedback design, the driver stages must provide hef .......
447: Tube DIY Asylum, OT: Totally OT--Web of Trust (0.00)
Posted by Dr Deville on 2004-05-14, 09:16:37 (68.32.213.214)
Hi Folks, I agree with you, Andy, and your dinner party analogy is apt. IMO, the future lies in a concept called "web of trust". In such a forum, each person can vote their approval of everyone else, .......
448: Tubes Asylum, Ah, Great! Thanks MB and Damir... (0.00)
Posted by Dr Deville on 2004-05-13, 17:00:11 (68.32.213.214)
For answering all my questions--you are true gentlemen. : ) MB: Are situations are indeed different, but you have given me good food for thought. I expect many happy hours investigating your suggestio .......
449: Tubes Asylum, Vanderveen PAT-2100/CFB Driver Circuits (0.00)
Posted by Dr Deville on 2004-05-13, 09:24:49 (68.32.213.214)
Hey MB, Many thanks for your information on driving the PAT-2100/CFB. Could you tell me what tubes, plate load resistor, etc., you used in the concertina and second driver stages of your PAT-2100/CFB? .......
450: Tube DIY Asylum, Cool! (0.00)
Posted by Dr Deville on 2004-05-12, 23:21:23 (68.32.213.214)
Thanks Mark, That makes sense, and is probably a good rule of thumb, if a minor one. Besides, having tubes staggered shows them off better. : ) I was concerned it was some sort of EM interference iss .......
451: Tube DIY Asylum, KT88 / KT90 Mounting--"Pins 4 and 8 in line"? (0.00)
Posted by Dr Deville on 2004-05-12, 22:30:06 (68.32.213.214)
Hi Folks, I'm getting some EH KT90 s and, since there is not much info out there on them, I'm looking at KT88 instructions and hoping they apply. In looking at KT88 mounting instructions on DuncanAmps .......
452: Tubes Asylum, Better Driver Circuits? (0.00)
Posted by Dr Deville on 2004-05-12, 15:22:16 (68.32.213.214)
"I do not like the driver circuits of Menno van der Veen - in some aspects they are marginal, therefore I use my own..." Hey MB, Thanks for the reply. Given your experience, I'd be very grateful to he .......
453: Tubes Asylum, Thanks For The Plitron Endorsement--I'm Building A Vanderveen Amp (0.00)
Posted by Dr Deville on 2004-05-12, 10:34:17 (68.32.213.214)
Hey Jim, Glad to hear you have had good luck. Did you build VTV's "Ultimate PP KT88 Amp"? ( http://www.plitron.com/pages/Products/Audio/vtvkt88.htm ) I have no experiences to relate yet, but, since I .......
454: Tube DIY Asylum, Thanks Henry (0.00)
Posted by Dr Deville on 2004-05-11, 12:08:49 (68.32.213.214)
I appreciate the distinction, and you taking the time to share it. Man, I have so much to learn. It's great! Best, George Ferguson .......
455: Tube DIY Asylum, What's An Extra Dimension Between Friends? (0.00)
Posted by Dr Deville on 2004-05-10, 21:14:05 (68.32.213.214)
Hey Mark, Thanks for the further insights and corrections--they are helpful and interesting. I've saved them for future reference. :) Folks like you make a big difference. Best, George Ferguson ::: TO .......
456: Tube DIY Asylum, Re: Right--About The Same Non-Linearity As A Resistor (0.00)
Posted by Dr Deville on 2004-05-10, 21:09:45 (68.32.213.214)
Hi Henry, Hmmm... I was thinking that you were splitting hairs, but perhaps rigor is a good thing when high voltages (and learning) are involved? ; ) Okay, how about this: both the test resistor and t .......
457: Tube DIY Asylum, Right--About The Same Non-Linearity As A Resistor (0.00)
Posted by Dr Deville on 2004-05-10, 15:09:08 (68.32.213.214)
Pimm's measurements show non-linearity, as decreasing effective impedance at high audio frequencies, due to device capacitance. If you look at his plots, his CCS's non-linearity is similar to a 2G res .......
458: Tube DIY Asylum, Current Conceptual Sources (0.00)
Posted by Dr Deville on 2004-05-10, 10:04:17 (68.32.213.214)
Hey Mark, Many thanks for the informative reply--your consideration is a big help. You are currently a conceptual source, and I am a current conceptual sink. Har! Admittance, eh? So that's the current .......
459: Tube DIY Asylum, CCS Conceptual Qs, Using Gary Pimm CCS as Example (0.00)
Posted by Dr Deville on 2004-05-09, 16:19:10 (68.32.213.214)
Greetings All, I've done a search, and not found a thread like this one, but if there is one, please point me to it and accept my apologies. :) I'm a semi-novice, am fascinated with CCS concepts, and .......
460: Tubes Asylum, ResellerRatings.com It Is Then! : ) (0.00)
Posted by Dr Deville on 2004-05-08, 14:41:43 (68.32.213.214)
Hey Eminem ; ) Thanks for the tip! That looks like a great place to share our experiences-- I will do so. Best, George Ferguson .......
461: Tubes Asylum, Seller Rating Services? (0.00)
Posted by Dr Deville on 2004-05-06, 23:19:49 (68.32.213.214)
Speaking only for myself, I enjoy hearing good experiences, and recently had one with Boiaudioworks.com (no affiliation, YMMV,Caveat Emptor, etc. ) Is there a rating/comment service for Tube audio ven .......
462: Tube DIY Asylum, To Quote Ghostbusters... (0.00)
Posted by Dr Deville on 2004-05-01, 12:13:59 (68.32.213.214)
"You don't know what it's *like* out there-- they expect *results*!" : D Best, George Ferguson .......
463: Tube DIY Asylum, Photos, We Must Have Photos!!! : D (0.00)
Posted by Dr Deville on 2004-05-01, 00:10:10 (68.32.213.214)
It's the least you can do for all us CCS/Differential Wannabes! : ) Best, George Ferguson .......
464: Tube DIY Asylum, Congrats Douglas, I Salute You! (nt) (0.00)
Posted by Dr Deville on 2004-05-01, 00:06:01 (68.32.213.214)
nt .......
465: Tube DIY Asylum, I'll Second That!!! And Lynn, Paul, Volt2nd... (0.00)
Posted by Dr Deville on 2004-04-28, 00:37:42 (68.32.213.214)
Add my name to the list of very grateful ponderers of Gary's website. His writings about separating AC and DC circuit paths, CCS's, and upgrading his amplifier with differential/CCS techniques are abs .......
466: Tube DIY Asylum, You Read Me... (0.00)
Posted by Dr Deville on 2004-04-25, 01:05:45 (68.32.213.214)
...like a book! ; ) Yes, "the book" is indeed Morgan Jones, and I have others stacked like firewood, waiting. It's great fun, and I am looking forward to "knowing nothing" for a long long time. : ) J .......
467: Tube DIY Asylum, Whuzzat? (0.00)
Posted by Dr Deville on 2004-04-24, 22:57:05 (68.32.213.214)
Hi Keto 'n All, Thanks for the schematic and the discussion-- they are interesting and informative, and I enjoy hearing about these hybrid circuits. If you would humor a newbie question, would someone .......
468: Tube DIY Asylum, Congrats! (0.00)
Posted by Dr Deville on 2004-04-12, 12:22:21 (68.32.213.214)
Very pretty. You must be a Proud Papa. : ) Does this mean you've finished your thesis? :D Best, George Ferguson .......
469: Tubes Asylum, Re: Q, Jim: How would EH KT88s compare sonically with SED 6550c's? (nt) (0.00)
Posted by Dr Deville on 2004-04-06, 12:26:42 (68.32.213.214)
Hi Jim, Sorry to threadjack, but how would you describe the KT-90s? I assume you are talking about EI--any preference between various types of EIs and the new EHs? Best, George Ferguson .......
470: Tube DIY Asylum, Re: Parallel DHT Tips (0.00)
Posted by Dr Deville on 2004-03-22, 10:26:26 (68.32.213.214)
Hey Helmut, Many thanks for the advice, and the New Sensor tip. I didn't know about them! Happy Tweaking, George Ferguson .......
471: Tube DIY Asylum, Re: Parallel DHT Tips (0.00)
Posted by Dr Deville on 2004-03-21, 10:31:14 (68.32.213.214)
Thanks Ivan, Very pretty! Can you point me to any schematics/parts list? Remember--lift with your legs! ; ) Best, George Ferguson .......
472: Tube DIY Asylum, Re: Forced Balance Diff. (0.00)
Posted by Dr Deville on 2004-03-18, 22:25:37 (68.32.213.214)
> As I see it Allen's forced balanced diff circuit forces the total current to be constant but there will still be a zero crossing point somewhere so the problem is still there. I am not sure that is .......
473: Tube DIY Asylum, Re No: No, and Yes. ; ) (0.00)
Posted by Dr Deville on 2004-03-18, 19:16:13 (68.32.213.214)
Hey Mark, Thanks for the reply and the info. >I think what you describe as "microdistortion" is the well known reduction in permeability near zero magnetic flux in transformer steels. This is because .......
474: Tube DIY Asylum, Re: Parallel DHT Tips (0.00)
Posted by Dr Deville on 2004-03-18, 11:53:37 (68.32.213.214)
Hi Helmut, Thanks very much for sharing your experiences and point of view--they are very interesting to me. I'll do the search you suggested. One question for now--you mention tube matching and therm .......
475: Tube DIY Asylum, Output Tranny EM Field Reversal Effects and Solutions (0.00)
Posted by Dr Deville on 2004-03-18, 11:44:15 (68.32.213.214)
Wow, so I wasn't completely off-base? I must be getting better. (Or just luckier ; ) If you're taking a break from your thesis, ponder this--my understanding is that Wright's Differential Amplifier, a .......
476: Tube DIY Asylum, Re: Parallel DHTs - Proof that More is Less (0.00)
Posted by Dr Deville on 2004-03-17, 22:12:18 (68.32.213.214)
Hey TK, Thanks very much for your advice--I value such insights, and appreciate you taking the time to share them. Best, George Ferguson .......
477: Tube DIY Asylum, You Know Me Too Well... (0.00)
Posted by Dr Deville on 2004-03-17, 22:09:33 (68.32.213.214)
Douglas said: >You're being seduced by pretty pictures and glowing technical >specifications again I resemble that remark! And you point is? ; ) Guilty as charged. I am a thermionic slut. The more glo .......
478: Tube DIY Asylum, New 65W 2x 211 SET--Information and Opinions (0.00)
Posted by Dr Deville on 2004-03-17, 16:29:44 (68.32.213.214)
Greetings Fellow Inmates, I am smitten with a new SET that I found on the Amplimo website ( Plitron in the US). Bert Fruitema built it, and calls it the ALFI HQSE-65. You can see photos at: http://www .......
479: Planar Speaker Asylum, Or A Trade Secret : ) (nt) (0.00)
Posted by Dr Deville on 2004-03-11, 12:11:11 (68.32.213.214)
no text .......
480: Planar Speaker Asylum, Re: The Mylar Panels and Crossovers Have Changed Too (0.00)
Posted by Dr Deville on 2004-03-10, 23:18:34 (68.32.213.214)
Hey Monk, For what it's worth, here's a quote from Brian Damkroger's Stereophile review, on the Maggie site: "Compared to the MG1.5/QR, which preceded it, the '1.6 incorporates two major changes, acco .......
481: Planar Speaker Asylum, Cool! Co. and Forum Are Very Helpful--Feel Free To Contact Me <nt> (0.00)
Posted by Dr Deville on 2004-03-10, 22:47:26 (68.32.213.214)
no text .......
482: Planar Speaker Asylum, The Mylar Panels and Crossovers Have Changed Too (0.00)
Posted by Dr Deville on 2004-03-10, 11:21:43 (68.32.213.214)
"Since the bass/mid mylar panels haven't changed that much over the years" Actually, that is not true. One of the big improvements that made the 1.6 into a Giant Killer is retensioning and optimizatio .......
483: Planar Speaker Asylum, Nice Post--Go for the Foreplay (0.00)
Posted by Dr Deville on 2004-03-10, 11:10:29 (68.32.213.214)
Hey Transfigure, Thanks for the post--you reminded me of one of the sublime joys of our hobby/passion. I checked out your system, and see that you are considering a Foreplay preamp, "if you have the b .......
484: Tube DIY Asylum, You're *Way* Off... (0.00)
Posted by Dr Deville on 2004-03-08, 21:01:50 (68.32.213.214)
Rodney--it's *2%* distortion at 1000W. ; ) Of course, that's distortion of the Time-Space Continuum. Har! I especially like the 2000W input power. And the 3,500V B+ Is that save to work on? If I keep .......
485: Tube DIY Asylum, Re: Bi-Amping and Tri-Amping!--Pick Your Religion (0.00)
Posted by Dr Deville on 2004-03-08, 11:47:50 (68.32.213.214)
Hey TK, Thanks for the update and friendly words. You might also consider trying a crossover point of 300Hz. Yes, this gets into the Vital Information range of 100 to 1000Hz, but statistically there i .......
486: Tube DIY Asylum, Bi-Amping and Tri-Amping!--Pick Your Religion (0.00)
Posted by Dr Deville on 2004-03-08, 00:25:39 (68.32.213.214)
Hey Triode User, You are venturing into an area of spirtual fervor, and will hear strong opinions in all directions. Some subscribe to the "Simple and Sweet" philosopy--SETs and horns. Others, in the .......
487: Tube DIY Asylum, Tip of the Hat to Keto--Awesome System! <nt> (0.00)
Posted by Dr Deville on 2004-03-08, 00:00:45 (68.32.213.214)
No text. .......
488: Planar Speaker Asylum, Re: Try the Marchand XM126 Tube x-over (0.00)
Posted by Dr Deville on 2004-03-05, 11:00:27 (68.32.213.214)
In case you haven't guessed, I am a total geek about such things. I researced the Marchand thoroughly, and heard nothing but good things about the unit's sound and quality, and the service Marchand su .......
489: Planar Speaker Asylum, What Tubes in the Marchand XM126 x-over? (0.00)
Posted by Dr Deville on 2004-03-05, 10:51:46 (68.32.213.214)
Hey Geo, I am building the XM126, and am curious as to which tubes you are rolling in it? best, George Ferguson .......
490: Bottlehead Forum, Great Company--Get's Me My Orders In A Flash! (nt) (0.00)
Posted by Dr Deville on 2004-03-02, 20:59:53 (68.32.213.214)
There is No Text here. .......
491: Planar Speaker Asylum, Another Calibration Proceedure (0.00)
Posted by Dr Deville on 2004-03-01, 18:59:59 (68.32.213.214)
Hey U2Fanatic, A good method is to get a disc with test tones, (I believe the Video Essentials discs have them, but am not certain)--tones of equal volume, going up and down the audio spectrum. Then, .......
492: Planar Speaker Asylum, Before You Hammer... (0.00)
Posted by Dr Deville on 2004-03-01, 15:30:26 (68.32.213.214)
You are on the right track, but check out this thread for where to locate your carpets, and how to hang them temporarliy so you can find where they work best: http://www.audioasylum.com/forums/MUG/mes .......
493: Planar Speaker Asylum, What Rico Said... (0.00)
Posted by Dr Deville on 2004-03-01, 11:23:53 (68.32.213.214)
Magneplanars are extremely popular in the audiophile community. Sure, audio-obsessive-geeks (like me) are a minority in the audio marketplace-- most just buy whatever mass-market speakers are availabl .......
494: Planar Speaker Asylum, More Acoustic Treatment Tips, Renovation Relevant (0.00)
Posted by Dr Deville on 2004-03-01, 11:07:21 (68.32.213.214)
Hey Andy, What Hem said! Here are some more rules of thumb: *Drapes and insulation-filled fabric panels are the high PAF (Partner Acceptance Factor, being non-sexist and lifestyle tolerant ;) absorbe .......
495: Planar Speaker Asylum, Pondering Is Fun--A Cheap And Easy Acoustic Experiment (0.00)
Posted by Dr Deville on 2004-02-29, 23:39:37 (68.32.213.214)
Sure Andy, There's lots to think about, but that's the joy of being a geek! Here's my suggestion for a free tweak that might surprise you. Get four old blankets, bedspreads, quilts, whatever. Drape tw .......
496: Planar Speaker Asylum, My Work Here Is Done! ; ) (0.00)
Posted by Dr Deville on 2004-02-29, 23:18:56 (68.32.213.214)
In celebration, I am now getting high on life. Best, George "Up, Up, and Away!!!" Ferguson .......
497: Planar Speaker Asylum, Guys, Don't Fight!! ; ) (0.00)
Posted by Dr Deville on 2004-02-29, 18:39:40 (68.32.213.214)
You're *both* beautiful! ; ) As I said, this is something over which reasonable people can disagree. An audio chain (and that chain includes the room) is only as strong as its weakest link. So the que .......
498: Planar Speaker Asylum, Re: Imaging Question (0.00)
Posted by Dr Deville on 2004-02-29, 12:44:36 (68.32.213.214)
This is an area where intelligent folks can disagree. I found huge bang-for-the-buck in room treatments. $300 to ring my room with high-quality Levlor 1 3/8" curtain rods from Home Depot, some old bl .......
499: Planar Speaker Asylum, Ah! You're Still Using Your 3.6 Internal Crossover (0.00)
Posted by Dr Deville on 2004-02-29, 10:35:00 (68.32.213.214)
That's probably a good idea, since your Phase Linear amp connected directly to your tweeter could probably eject the ribbon with enough velocity to insert it into lunar orbit. ;) Since you're using yo .......
500: Planar Speaker Asylum, I Paid About $1700 For My 1.6s... (0.00)
Posted by Dr Deville on 2004-02-29, 10:18:43 (68.32.213.214)
And had to twist my dealer's arm to get him to agree to 1 year trade-up priviledges. He said "You know, we have to sell the speakers you return." Best, George Ferguson .......
Found total of 500 records, Query: , Author: Dr Deville in All Forums, Time: 0 sec.