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1: Tube DIY Asylum, RE: lol (nt) (0.00)
Posted by tubefever on 2008-12-12, 11:56:42 (66.117.135.184)
nt .......
2: Tube DIY Asylum, RE: TFA-2004 (0.00)
Posted by tubefever on 2008-12-12, 11:42:54 (66.117.135.184)
I'm crossing over threads here, but do you still have any of the TFA-2004s without plastic? .......
3: Tube DIY Asylum, RE: Acetate (0.00)
Posted by tubefever on 2008-12-12, 11:29:08 (66.117.135.184)
Hi Mike--this information is very helpful. Of course the ultimate arbiter is at school right now, but I see a discussion about organic and inorganic chemistry this weekend. Separate from this thread, .......
4: Tube DIY Asylum, Delrin (0.00)
Posted by tubefever on 2008-12-12, 10:59:25 (66.117.135.184)
According to Wikipedia, Delrin was used for wheel bearings in Hot Wheels cars in the late 60s. That takes me back. .......
5: Tube DIY Asylum, RE: environmental reasons? (0.00)
Posted by tubefever on 2008-12-12, 10:20:10 (66.117.135.184)
Maybe. At school and at home, there is a sense of, "Disposable plastic: BAD. Glass, wood, metal: GOOD. Not that there is anything disposable about a tube amp. My son brought it up, and it seemed like .......
6: Tube DIY Asylum, RE: Amp without plastic (0.00)
Posted by tubefever on 2008-12-12, 10:11:17 (66.117.135.184)
The idea was my son's. I'm hoping it will hold his interest in a project that is somewhat less thrilling for him than his Wii. Even the question about what constitutes "plastic" is interesting to disc .......
7: Tube DIY Asylum, Transformer Options (0.00)
Posted by tubefever on 2008-12-12, 09:58:33 (66.117.135.184)
Yes--it is definitely an exercise that slows the project down for my son and me. And gives an interesting angle on the process of finding parts. Deciding which old transformers to try in place of the .......
8: Tube DIY Asylum, RE: An exercise (0.00)
Posted by tubefever on 2008-12-12, 09:45:11 (66.117.135.184)
Yes--blame it on newfangled ideas my son gets at school, recycling programs, bisphenol A alerts, Obama. But I think it is an interesting way to hold his interest. We get focus on each individual part, .......
9: Tubes Asylum, RE: 6SC7+6K7 history question (0.00)
Posted by tubefever on 2007-11-01, 19:45:18 (66.117.135.184)
It's a National/Dobro guitar amp on e-Bay. I just quieried the seller; the first tube is a 6K7 pentode. I'm looking for guitar amps built before WWII, and I'm wondering if this might be one. ::: TOPIC .......
10: Tubes Asylum, Thx (nt) (0.00)
Posted by tubefever on 2007-08-19, 16:43:56 (66.117.135.184)
nt .......
11: Tubes Asylum, RE: Gibsonoid Mystery Amp (0.00)
Posted by tubefever on 2007-08-19, 12:45:02 (66.117.135.184)
It has a lot of Gibson-like features. The cabinet is square shouldered and cloth covered like the earlies Gibsons (but it's blue). The circuit uses a 6N7 paraphase splitter like some EH-100s. But it u .......
12: Tubes Asylum, ST (0.00)
Posted by tubefever on 2007-08-19, 10:38:43 (66.117.135.184)
It's a 5V4-G. .......
13: Tubes Asylum, When were 1st octal-based rectiifers? (0.00)
Posted by tubefever on 2007-08-19, 08:10:50 (66.117.135.184)
I'm dating an early guitar amplifier that has no EIA codes. Tube compliment = 6N7 x 2, 6F6 x 2, 5V4 x 1. The 5V4 could be a replacement, but the octal rectifier socket looks original. Can anyone tell .......
14: Tube DIY Asylum, RE: you have mail (0.00)
Posted by tubefever on 2007-06-24, 00:58:19 (66.117.135.184)
Excellent--thanks! .......
15: Tube DIY Asylum, Question for Drummerwill (0.00)
Posted by tubefever on 2007-06-23, 00:29:41 (66.117.135.184)
...or anyone else in the know. In the Wurlitzer 660 juke box amps, how are the 30 triode heaters wired up? I know they use DC, but the schematic I have is so bad I can't read any resistor or cap value .......
16: Tube DIY Asylum, RE: Wurlitzer 661s (0.00)
Posted by tubefever on 2007-06-03, 12:07:07 (66.117.135.184)
Hi Willie I've been reading your posts with interest ever since I found this amp. Very nice work! Since I have one chassis and have been yearning for a SE 45 amp for some time now, I think I'm going t .......
17: Tube DIY Asylum, SET amp recommendations using 45 +/- 27, 30, 56 (0.00)
Posted by tubefever on 2007-06-03, 04:35:15 (66.117.135.184)
After a quick foray into guitar amps (that lasted 2 years), I am returning to the fold with an amp project using an old Wurlitzer Jukebox amp chassis as a starting point. I'm hoping to build a user fr .......
18: Tube DIY Asylum, Re: End of Zen (0.00)
Posted by tubefever on 2004-01-01, 22:11:10 (66.167.76.32)
Search on these pages for "End of Zen" -- a terrific single-ended amp using inexpensive tubes and transformers. If you don't use Cerafine capacitors, you can probably bring it in for $250. But if you .......
19: Tube DIY Asylum, Re: SE amp..EL34 or 6L6.. (0.00)
Posted by tubefever on 2003-10-17, 23:52:28 (66.167.204.103)
I've built the Fi Primer EF86-->6L6 SE UL amp using Electraprint O/P transformers. This amp sounds great--and could probably be adapted for EL34s. .......
20: Tube DIY Asylum, Re: Pictures (0.00)
Posted by tubefever on 2003-07-01, 22:17:46 (66.167.205.32)
Looking forward to pics. I'm just finished rebuilding a salvaged 6V6 amp myself. .......
21: Tube DIY Asylum, Kepco regulator (0.00)
Posted by tubefever on 2003-06-26, 20:40:35 (68.165.7.132)
Well now, that's interesting. The KT66s I'm using were pulled from the back of a Kepco voltage regulator just this AM. Something synchronous going on here..... .......
22: Tube DIY Asylum, Re: Partsconnexion has them (0.00)
Posted by tubefever on 2003-06-26, 18:30:55 (69.3.141.221)
www.Partsconnexion.com in Oakville, Ontario has them and they are nice people to deal with. They also have TDKs for a bit more. .......
23: Tube DIY Asylum, ElectraPrint Iron in 6L6 SE UL (0.00)
Posted by tubefever on 2003-06-26, 07:54:10 (69.3.141.221)
A year ago I built the 6L6 SE UL amp from the Fi Primer. It's been limping along with Hammond 125ESE o/p transformers until last night when I installed some ElectraPrint 3K O/P transformers (the TM3KB .......
24: Tube DIY Asylum, Best way to wed tubes and SACD 5.1? (0.00)
Posted by tubefever on 2002-12-18, 11:51:58 (165.247.220.1)
As prices come down, I'm thinking of jumping into SACD/DVD-A. I'm wondering how people are dealing with 5 channels. Building 5 channel amps? 5 monoblocks? And what about preamps? Does this mean SS pre .......
25: Tube DIY Asylum, Help with Eico HF-86 clone (0.00)
Posted by tubefever on 2002-11-07, 11:09:08 (209.86.252.67)
Building a HF-86 clone (EL84 P-P). Any recommendations on mods to the basic design? Thanks. .......
26: Tube DIY Asylum, Which SE output transformer for Fi Primer 6L6SE? (0.00)
Posted by tubefever on 2002-09-30, 12:52:09 (209.239.208.36)
Am planning the JC Morrison 6L6SE amp and am wondering which output transformer to use since the recommended one is no longer available. How do people rate Hammond 125E, 125ESE, 1627, Magnequest, Elec .......
27: Tube DIY Asylum, Re: Thanks. Will report back (nt) (0.00)
Posted by tubefever on 2002-08-26, 12:19:45 (209.239.204.232)
nt .......
28: Tubes Asylum, Re: Loctal equivalents (0.00)
Posted by tubefever on 2002-06-04, 10:09:23 (209.239.199.192)
I hear that a 7B4 = 1/2 12AX7. Just wondering if there is a double triode equivalent. I have both 7Y4 and 7Z4s. Any idea which is closer to a 5Y3? .......
29: Tubes Asylum, Loctal equivalent of 12AX7? (0.00)
Posted by tubefever on 2002-06-04, 01:10:21 (209.239.199.195)
Building a guitar amp. Have 7C5s for 6V6s. Wondering if there are loctal equivalents for 12AX7s and 12AY7s? .......
30: Bottlehead Forum, With integrated Foreplay, where do I put the 470K output resistor? (0.00)
Posted by tubefever on 2002-06-04, 01:06:27 (209.239.199.195)
Building a Foreplay and a 6V6 PP amp (the Rick Spencer design from AudioXpress (Sept '01)) in the same enclosure. I will be wiring the output caps directly to the 6SL7 input tubes of the PP amp. Where .......
31: Tube DIY Asylum, DIY 6L6 SE recommendations (0.00)
Posted by tubefever on 2002-05-21, 23:43:11 (209.239.210.6)
Found an old Airline (M.Ward) mono PP amp with 2 6L6-GAs, a 6SL7, a 5U4G, and 2 other tubes I've never heard of (12SQ7 & 12SC7). The power transformer secondaries are 300-0-300, 5 and 6.3VAC. Thinking .......
32: Tube DIY Asylum, Re: thanks(nt) (0.00)
Posted by tubefever on 2002-05-16, 20:38:41 (209.239.204.174)
nt .......
33: Tube DIY Asylum, Re: Duncan PSU Designer: how do I choose the load? (nt) (0.00)
Posted by tubefever on 2002-05-15, 22:41:30 (209.239.193.67)
nt .......
34: Bottlehead Forum, Re: how 'bout those Leafs, eh? (0.00)
Posted by tubefever on 2002-04-21, 02:19:09 (209.239.194.178)
Ex-Torontonian, now living in Berkeley, tho I still pine for the northland, esp during the playoffs. As for your hummmmmmm: I built a Foreplay last year, and since then 3 clones in different boxes. My .......
35: Tubes Asylum, PAS tone pot replacements (0.00)
Posted by tubefever on 2002-04-15, 11:56:29 (209.239.193.241)
Can anyone recommend good sounding replacement pots for the 400K and 750K tone controls in a Dyna PAS 3? Do they have to be exactly these values (hard to find)? Thanks .......
36: Tweakers' Asylum, Best PCB stereo amp kit (0.00)
Posted by tubefever on 2002-03-05, 12:29:42 (209.239.202.42)
Need an inexpensive SS amp kit, 15-30 WPC. Anybody have any experience with the amplifier and power supply kits that are out there (Velleman etc)? .......
37: Tube DIY Asylum, Audio Reality vs. Valve Amplifiers (0.00)
Posted by tubefever on 2002-02-23, 22:19:19 (209.239.196.27)
Which of these should I buy for vacation reading? Interested in a mixture of theory and practical tips leading to amplifier projects (so far, have built a Foreplay, a 300B kit, and a SE 1626 from scra .......
38: Tube DIY Asylum, Looking for push-pull EL34 circuit (0.00)
Posted by tubefever on 2002-02-12, 22:25:48 (209.239.196.247)
I'm looking for a schematic of a basic push-pull circuit using EL34s, that will also take 6550s (similar to the AE-25/Superamp). .......
39: Tube DIY Asylum, P-P amp project recommendations (0.00)
Posted by tubefever on 2002-02-03, 05:23:23 (209.239.204.26)
Looking for a simple, easy to build, fabulous sounding, inexpensive, tweakable push-pull amp schematic. I have built a 300B SET from a kit, and just finished my first scratch project-- a "DC Darling" .......
40: Bottlehead Forum, Re: Newbie capacitor metaphors (0.00)
Posted by tubefever on 2002-01-25, 07:23:48 (209.239.194.101)
To continue the water flowing through the pipes analogy, I think of a capacitor as a water tower. It is filled up by a slow steady continuously flowing stream of water, but it can discharge large quan .......
41: Bottlehead Forum, Re: ringing and snubbers (0.00)
Posted by tubefever on 2002-01-22, 23:51:50 (209.239.210.181)
Do you recommend adding something to the Foreplay PS based on Paul's post? .......
42: Tube DIY Asylum, Re: 47uF or .47uF @ 630V Solens (0.00)
Posted by tubefever on 2002-01-21, 13:38:34 (209.239.207.218)
My schematic isn't very clear for the End of Zen amp. Wondering if the last caps in the PS are 47uF or .47uF? Similarly, with the Cathode bipass caps--are they 22uF or .22uF @630V Solens? Thanks, Sha .......
43: Tube DIY Asylum, Darling vs. DC Darling vs End of Zen (0.00)
Posted by tubefever on 2002-01-20, 23:20:13 (209.239.196.44)
After building a few kits, I'm planning my first amp from a schematic. Any thoughts about these three. The Darlings are 3/4W amps built around 1626 tubes and parts are ~$175. The End of Zen puts out 1 .......
44: Bottlehead Forum, Re: Resistors & Capacitors (0.00)
Posted by tubefever on 2002-01-16, 14:16:37 (209.239.195.17)
I read a post a while back saying that the stock Foreplay resistors were Xicons. These (and other resistor types) can be purchased online from www.mouser.com. Do a search under resistors and you will .......
45: Bottlehead Forum, Foreplay output caps: How big is too big? (0.00)
Posted by tubefever on 2002-01-16, 04:22:39 (209.239.201.113)
I'm considering 4.7uF 630V Auricaps--wondering if anyone has gone higher, and if there is a down side. .......
46: Tube DIY Asylum, Recommendations for tube amp project ~$200 (0.00)
Posted by tubefever on 2002-01-14, 13:55:49 (209.239.197.217)
I have built an amplifier kit (300B) and a few preamps (Foreplay + variants). Now I want to build a small inexpensive amp from scratch--could be PP or SET. Any recommendations for tried and true desig .......
47: Bottlehead Forum, Re: Voltage regulator (0.00)
Posted by tubefever on 2002-01-13, 21:56:04 (209.239.204.119)
Does your VR get too hot to touch within a minute? If so, a bigger heat sink should help. You might also consider using two 317s to drop the voltage in two stages. If so, why not add a current regulat .......
48: Bottlehead Forum, Re: Can't get my DC filament supply to rise above 6.0V (0.00)
Posted by tubefever on 2002-01-10, 23:37:25 (209.239.204.133)
I have built both LM317 and LT1086 DC filament supplies with voltage regs followed by a current reg for my V2 FP. No matter how I manipulate R1 and R2, I can't get the filament voltages above 6.03V. I .......
49: Tube DIY Asylum, Rick Spencer 12SL7/12V6 Amp (0.00)
Posted by tubefever on 2002-01-09, 00:30:03 (209.239.210.6)
Wondering if anyone has built the 12SL7/12V6 amp described by Rick Spencer in Dec 2001 AudioXpress? .......
50: Bottlehead Forum, Re: DC heater supplies (0.00)
Posted by tubefever on 2002-01-03, 11:50:25 (209.239.208.173)
Run a search under "DC Heater", "LM317", "LT1086" and you will find a wealth of advice about different DC heater supply schemes. I have just been around the block with Phil Sieg builting a RonanReg cu .......
51: Bottlehead Forum, Excellent! Thank-you. (nt) (0.00)
Posted by tubefever on 2002-01-02, 22:37:34 (209.239.198.203)
nt .......
52: Bottlehead Forum, Re: Foreplay heater current reading (0.00)
Posted by tubefever on 2002-01-01, 23:15:41 (209.239.201.177)
Am building a current-regulated DC heater supply for my Foreplay (with much help from Phil S and others) --V.2(6.3V)-- using LT1086 regulators and a 12.6, 1A transformer. I have the final current regu .......
53: Bottlehead Forum, Re: thanks (0.00)
Posted by tubefever on 2002-01-01, 22:16:09 (209.239.210.45)
Thanks for all your help and patience--I have a much clearer understanding of these power supplies and the various calculations. I'll continue working on this and may post above to see if anybody know .......
54: Bottlehead Forum, Re: Don't cry (0.00)
Posted by tubefever on 2002-01-01, 22:05:19 (209.239.210.45)
I have 91dB 4 ohm speakers -- my Foreplay and 300B SET amp drive them to unacceptably loud levels. I am planning a sub, however. .......
55: Bottlehead Forum, Re: parallel vs series (0.00)
Posted by tubefever on 2001-12-30, 21:24:29 (209.239.194.195)
I ran seperate wires from the RR to each filament--didn't change the current across each filaments (still 600mA). I tried doubling the current setting resistor to 4r0--this cut the current across the .......
56: Bottlehead Forum, Re: Not sure ... (0.00)
Posted by tubefever on 2001-12-30, 11:23:20 (209.239.203.43)
I may have it wrong. My filament supply is basically the 6.3V Foreplay version. The + passes through pin 4&5 of the B tube and continues on to 4&5 of the A tube. The - runs from pin 9 of the A tube to .......
57: Bottlehead Forum, Re: Ok, so... (0.00)
Posted by tubefever on 2001-12-30, 01:34:43 (209.239.202.241)
I have increased the current setting resistor to 2r0. The rest of the resistors are correct. The caps I'm using in the C3 and C5 positions have higher values than on the RR schematic (330uF instead of .......
58: Bottlehead Forum, Re: Required data (0.00)
Posted by tubefever on 2001-12-29, 09:40:26 (209.239.197.204)
Line voltage = 114-115VAC. Power transformer = MagneTek F5-12 from Mouser (primary = 115VAC), output = 12.6 @ 1.0A. .......
59: Tweakers' Asylum, Grounding Question (0.00)
Posted by tubefever on 2001-12-29, 00:58:35 (209.239.204.14)
Building a SET amp, live in a 100 year old rented house, just realized there are NO grounded outlets in the entire house! What's the best way to ground a single outlet? I have easy access to the under .......
60: Bottlehead Forum, Re: Some Answers (0.00)
Posted by tubefever on 2001-12-28, 16:05:38 (209.239.197.213)
(1)Is your current setting resistor 4r17? -->No: 1r2 (2) Are you running both tubes off one regulator? -->Yes If so how do you have the filaments wired? --> parallel. (3) Is pin 9 grounded? --> It's c .......
61: Bottlehead Forum, Re: Help with capacitor upgrade for Foreplay. (0.00)
Posted by tubefever on 2001-12-28, 09:17:40 (209.239.207.208)
The green caps are the ones you want to upgrade. They run from pin 8 to the center of the output RCA jacks. The caps that come with the kit are usually 2.2 mF. Many people increase the value of the ca .......
62: Bottlehead Forum, Yet another RonanReg question (0.00)
Posted by tubefever on 2001-12-27, 20:55:26 (209.239.210.182)
This is for 12AU7 filament supplies in a Foreplay (6.3V 300mA). I have the Ohmite 10 ohm 12.5V wirewound (cost more than my valves) after the filter caps and before the first VR. I have R1&3 @ 120r0, .......
63: Bottlehead Forum, Re: *star ground destinations* (0.00)
Posted by tubefever on 2001-12-26, 03:55:50 (209.239.210.218)
How does it sound with the ground as described? .......
64: Bottlehead Forum, Re: RonanReg Question (0.00)
Posted by tubefever on 2001-12-26, 03:52:27 (209.239.210.218)
I'm trying to regulate current. I have 3 LT1086s with the first two configured as voltage regulators and the last one set up as a current regulator. The schematic has been posted here a few times by P .......
65: Bottlehead Forum, More RonanReg questions for Phil Sieg (0.00)
Posted by tubefever on 2001-12-25, 23:17:20 (209.239.197.64)
Thanks for your helpful posts. My first go at the RonanReg used R2=464r0 and R4=169r0 (taken from John Levreult's schematic) and this yielded a low output voltage (~3VDC). With R2=862r0 and R4=735r0 ( .......
66: Bottlehead Forum, RonanReg Question (0.00)
Posted by tubefever on 2001-12-23, 20:56:14 (209.239.210.32)
I just finished building a DC heater power supply for my Foreplay, using the RonanReg schematic and LT1086s. I have a 12VAC, 1A transformer. If I use the recommended resistor values, I can't get the v .......
67: Bottlehead Forum, Re: Resistor Upgrade (0.00)
Posted by tubefever on 2001-12-23, 20:43:17 (209.239.210.32)
I have tried a number of resistors in my Foreplays. I use 3W wirewounds from Vishay/Dale (Mouser) in the power supply and HV snubber. I started with Dale 1/2W (the 32 cent ones from Mouser) everywhere .......
68: Bottlehead Forum, Re: Foreplay channel isolation question (0.00)
Posted by tubefever on 2001-12-18, 11:06:02 (209.239.204.185)
I have the PDPS set up on 2 different Foreplays. I think I tried to isolate the channels as described, but had problems with it. Now I have bothe channels attached to SPG and it is quiet in both units .......
69: Tubes Asylum, 12AU7 identification (0.00)
Posted by tubefever on 2001-12-16, 19:29:14 (209.239.197.56)
Can anyone identify this tube? I bought it used from Jack Elliano for $1 as a spare. It sounds great and I would like to find a partner for it. The ink is all gone, but it was labelled Amperex. Steve .......
70: Bottlehead Forum, Re: Newbie advances in current-regulated DC battle (0.00)
Posted by tubefever on 2001-12-15, 08:20:46 (209.239.207.31)
Thanks. I added a second LM317, and connected ADJ and Vout with a 1.25 ohm--I think this makes a voltage regulator followed by a current regulator. Sounds better--all the mid/high detail with less har .......
71: Tubes Asylum, Re: Mystery tube indentification on 6SN7 and 6SL7 NOS . (0.00)
Posted by tubefever on 2001-12-15, 05:22:15 (209.239.196.169)
How does one get a photo to appear in a post? Thanks Shane .......
72: Bottlehead Forum, Re: Newbie admits partial defeat in current-regulated DC battle (0.00)
Posted by tubefever on 2001-12-15, 05:15:21 (209.239.196.169)
Now think I may have built a nice voltage-regulated DC PS. If I take out the resistor between ADJ and neg, how do I control the voltage (which will be too high)? Thanks Shane .......
73: Bottlehead Forum, Newbie claims partial victory in current regulated DC battle (0.00)
Posted by tubefever on 2001-12-14, 22:37:26 (209.239.207.125)
I managed to get a simple current-regulated DC filament supply to my FP tubes operating tonight, and I have a few questions. I'm using a 12V 1A transformer, the RS LM317T (heatsinked) with a full brid .......
74: SET Asylum, Re: SE-1 vs Superamp (0.00)
Posted by tubefever on 2001-12-13, 11:55:09 (209.239.197.153)
I have (and enjoy) an SE-1 Sig, but I almost bought the AE-25. I've always wondered how they compare. Can you compare and contrast? Thx Shane .......
75: Tweakers' Asylum, Re: Angela vs. Jensen vs. AudioNote Caps (0.00)
Posted by tubefever on 2001-12-09, 12:26:43 (209.239.198.98)
Re: your positive experience with the AudioNote caps: Did you try Jensens some time in the past? .......
76: Bottlehead Forum, Output cap values (0.00)
Posted by tubefever on 2001-12-09, 01:35:21 (209.239.207.11)
I have Auricap 2.2 @ 200V output caps in my FP, am thinking about changing. Wondering if any body has compared 3.0, 3.3 or 4.0s? Amp is AES SE-1 300B. Thanks Shane .......
77: Tweakers' Asylum, Angela vs. Jensen vs. AudioNote Caps (0.00)
Posted by tubefever on 2001-12-09, 01:28:45 (209.239.207.11)
Are these copper FIO caps still the same? If not, how do they compare? Thanks, Shane .......
78: Bottlehead Forum, 12AU7 advice (0.00)
Posted by tubefever on 2001-12-09, 01:14:31 (209.239.207.11)
Need help with 12AU7 choices for FP. Currently have JJ/Teslas (sound OK). Managed to kill both 5814s that came with FP (probably from too much taking out and putting back in again). Bought a pair of .......
79: Bottlehead Forum, Hum Asylum (0.00)
Posted by tubefever on 2001-12-09, 00:06:45 (209.239.210.162)
Has anybody ever pulled together all the posts on hum? The collective expertise on this subject at this forum and the other forums is really quite remarkable. .......
80: Bottlehead Forum, Re: safety vs signal grounds (0.00)
Posted by tubefever on 2001-12-08, 23:58:23 (209.239.210.162)
BM We are in similar territories as I have been chasing buzz to the point of Dual pseudo mono PS (w oversized caps) in seperate chassis, HV snubber, filament snubber (since pulled), shielding, output .......
81: Tubes Asylum, Re: Amperex 12AU7 identification (0.00)
Posted by tubefever on 2001-12-08, 00:56:47 (209.239.199.204)
There is a seam on top. If the anode plates are the grey, vertically oriented housings, there are two pairs of rectangular holes on either side of each housing. .......
82: Tubes Asylum, Amperex 12AU7 identification (0.00)
Posted by tubefever on 2001-12-07, 23:26:49 (209.239.210.4)
I have 1 Amperex 12AU7-type tube. Would like to buy a partner but all the ink has rubbed off it. Is there a site that has photos of Amperex tubes that I can compare it to? It has a tilted halo up top .......
83: Bottlehead Forum, Re: weird Foreplay ground situation (0.00)
Posted by tubefever on 2001-12-06, 12:50:04 (209.239.198.242)
Is it possible that the chassis is meeting SPG though the volume pots or selector switch? .......
84: Bottlehead Forum, Thanks (nt) (0.00)
Posted by tubefever on 2001-12-05, 22:10:32 (209.239.201.30)
nt .......
85: Bottlehead Forum, LT1086CT VOltage Regulators (0.00)
Posted by tubefever on 2001-12-05, 16:44:19 (209.239.198.53)
For Foreplay regulated DC heater supply, should I order the 12V version (LT1086CT-12-ND) or the Adjustable Voltage version (LT1086CT-ND)? Thanks Shane .......
86: Bottlehead Forum, Re: current regulated heater supplies (0.00)
Posted by tubefever on 2001-12-05, 02:18:34 (209.239.202.90)
I used the Kemet 1uF 100v X7Rs (from Mouser) in my filament snubber. Found they killed virtually all my buzz. The addition of the 100uF electrolytic had little effect. I've pulled the snubber because .......
87: Bottlehead Forum, Will do (nt) (0.00)
Posted by tubefever on 2001-12-03, 23:23:47 (209.239.207.130)
nt .......
88: Bottlehead Forum, Help with Current Regulated DC Filament Supply for Newbie (0.00)
Posted by tubefever on 2001-12-03, 21:34:44 (209.239.204.220)
Back already! For the LM317 circuit, do I generate initial DC with a 10-12VAC into 4 x 1N5822s? Can I use a bridge rectifier (eg W02) instead? Thanks. Shane .......
89: Bottlehead Forum, Re: Help with Current Regulated DC Filament Supply (0.00)
Posted by tubefever on 2001-12-03, 13:26:19 (209.239.195.176)
Thanks for your help--this really is the most incredibly helpful forum. I may start with the simpler LM317 regulator and work my way up. Will check back when I'm in the thick of it Shane .......
90: Bottlehead Forum, Help with Current Regulated DC Filament Supply for Newbie (0.00)
Posted by tubefever on 2001-12-02, 22:48:47 (209.239.204.110)
I converted my Foreplay heaters to DC using a cheap unregulated adjustable transformer. No buzz. Have read posts going back 2 years on current regulated DC filament supplies and how good they sound. H .......
91: Tube DIY Asylum, 300B SET amp Q: Any reason not to substitute a 0.22 630V coupling cap with a 0.22 1.5KV? (0.00)
Posted by tubefever on 2001-12-02, 21:44:20 (209.239.197.139)
Thanks .......
92: SET Asylum, Re: To Cary 300SE-Sigs owners: Anyone has changed Coupling caps? (0.00)
Posted by tubefever on 2001-12-02, 21:39:41 (209.239.197.139)
I have an AES SE-1 Sig that came with the same Audio 1 coupling caps. I swapped in some Angela Copper Foil in Oil 0.22 630V caps (which I understand may be the same as Jensens). BIG change in sound. L .......
93: Tubes Asylum, Re: Tube Mono Block Kit ( for a kid to learn on while building ) ?? (0.00)
Posted by tubefever on 2001-11-29, 21:30:14 (209.239.198.135)
Check out these monoblock kits at Antique Electronic Supply (www.tubesandmore.com) for $ 89.95 EA. Part number : K-501. Uses 11BM8 tubes included in the kit. .......
94: Bottlehead Forum, I believe the effect is exponential (nt) (0.00)
Posted by tubefever on 2001-11-26, 11:52:21 (209.239.207.163)
nt .......
95: Bottlehead Forum, Re: Voltseconds! Filament Snubber question (0.00)
Posted by tubefever on 2001-11-25, 20:25:25 (209.239.195.245)
Would you describe how you built your DC power supply (in enough detail that a slightly slow person can understand)? I think this may be my next project. How does it sound compared to the AC? Thanks. .......
96: Bottlehead Forum, Re: mods (0.00)
Posted by tubefever on 2001-11-25, 09:45:57 (209.239.210.227)
This is my second Foreplay (I keep the stock one for when this one's in the shop) and it has some non-standard elements, like a seperate power supply with higher voltage caps, the pseudo-dual PS, etc. .......
97: Bottlehead Forum, Re: Auricaps (0.00)
Posted by tubefever on 2001-11-25, 01:26:13 (209.239.196.132)
I've tried Solens (2.2mF 200v and 450V, 3.3mF 630V) and Auricaps (2.2 200V). The Solens cost a few dollars and are an improvement on the stock caps. The 3.3s sound better than the 2.2's. The Auricaps .......
98: Bottlehead Forum, Re: Resistors for VS's Filament Snubber (0.00)
Posted by tubefever on 2001-11-25, 01:16:51 (209.239.196.132)
Correction: I used Rikens for the shunt mod. .......
99: Bottlehead Forum, Resistors for VS's Filament Snubber (0.00)
Posted by tubefever on 2001-11-25, 00:34:58 (209.239.207.78)
I want to try to add a 'smidge' of filament snubbing to my Foreplay to get rid of some buzz. The full snubber as described in VS's notes eliminated my buzzing completely, but shrank the soundstage too .......
100: Bottlehead Forum, Re: Chasing Hum (0.00)
Posted by tubefever on 2001-11-24, 00:46:38 (209.239.210.239)
I, too, am chasing hum in a Foreplay rebuild. Would love to hear about your experiences in as much detail as you can provide. Regards Shane .......
101: Bottlehead Forum, Re: Foreplay Heater Voltages (0.00)
Posted by tubefever on 2001-11-22, 22:17:00 (209.239.210.109)
I tried the filament snubber (see below-->Snubber Ate My Soundstage), so I am searching for other options. I have built an outboard power supply, with the Pseudo-Dual configuration and 220mF 450V caps .......
102: Bottlehead Forum, Foreplay Heater Voltages (0.00)
Posted by tubefever on 2001-11-22, 05:32:23 (209.239.196.151)
Please help me understand. I'm trying to tame some buzz that I'm convinced is coming from the 6.3V heater supply. My heater voltages are ~53. B+ (tab2) ~191. Per recommendations of VS/Doc B, I wanted .......
103: Bottlehead Forum, Re: resistor values in foreplay (0.00)
Posted by tubefever on 2001-11-21, 15:38:19 (209.239.207.237)
Some believe that substituting higher wattage resistors will improve the sound. .......
104: Bottlehead Forum, Re: Doc's right. It ain't broke (0.00)
Posted by tubefever on 2001-11-19, 20:45:27 (209.239.208.198)
Well . . . fact is, I'm still trying to get rid of this hum. I thought lowering the B+ voltages might help. The heater voltages are almost spot on. .......
105: Bottlehead Forum, Reducing Foreplay Voltages (0.00)
Posted by tubefever on 2001-11-19, 13:33:47 (209.239.207.124)
What is the best way to reduce Foreplay voltages. Mine consistantly run 15-20% high (the unit sounds great). .......
106: Bottlehead Forum, Microphony--tube or socket (0.00)
Posted by tubefever on 2001-11-19, 13:25:43 (209.239.207.124)
As I have been making changes in my Foreplay (eg. star ground), any tube I put in it sounds microphonic. Tapping on the tube makes a brittle ringing sound come out of the speakers. If I touch the tube .......
107: Bottlehead Forum, Re: Bass Boxes (0.00)
Posted by tubefever on 2001-11-16, 00:13:59 (209.239.207.242)
Is it possible to construct the box with the driver firing downward and still get a good sound? I'd like to hide the sub inside a table or something. Thanks Shane .......
108: Bottlehead Forum, Re: Soundstage Questions (0.00)
Posted by tubefever on 2001-11-16, 00:08:00 (209.239.207.242)
Since installing the filament snubber, instruments seem much more localized at the speakers--that is, sound clearly comes from one or other speaker. Previously, the music existed in the general area o .......
109: Bottlehead Forum, Help! Snubber ate my soundstage (long) (0.00)
Posted by tubefever on 2001-11-15, 00:40:17 (209.239.196.93)
The new filament snubber in my Foreplay does a great job of cutting the buzz/hummmm, but the sound has pulled back into the speakers. The overall sound is a bit drier, with a touch more sibilance on v .......
110: Tube DIY Asylum, Re: wood enclosures (0.00)
Posted by tubefever on 2001-11-13, 16:42:35 (199.35.86.196)
I have built two preamps in wooden cigar boxes. I lined them with adhesive backed copper foil for chassis ground/RF protecion--easier than drilling into copper plate. They look and sound fabulous. TF .......
111: Bottlehead Forum, Re: Received 4Play Yesterday, Listening Tonight! (0.00)
Posted by tubefever on 2001-11-11, 01:33:20 (199.35.87.15)
"It's only the beginning . . ." Congrats on getting your FP up and running. Do a search under Buzz or Hum for suggestions. Common solutions are: 1) installing a snubber (two resistors and two caps) be .......
112: Bottlehead Forum, Re: not Olen, but (0.00)
Posted by tubefever on 2001-11-09, 11:39:30 (199.35.86.237)
Thanks for your post. Where exatly did you put the ferrite clamps? Just before the lines exit the box? Also, I have a pre-diode spike filter. Where did you put the post-diode filter and what was it li .......
113: Bottlehead Forum, Outboard power supply Q for Olen (0.00)
Posted by tubefever on 2001-11-09, 04:44:59 (199.35.86.75)
Olen, I'm building an outboard power supply for my Foreplay, and I'm looking for wisdom, ideas, watch-outs. Thought I might find this through your link at Bottlehead but can't access pages. Have you m .......
114: SET Asylum, Re: I second this question (0.00)
Posted by tubefever on 2001-11-07, 23:20:23 (199.35.85.9)
I have an AES SE-1 Sig. and am also curious about the benefits of the outboard power supply. I have only compared JJ/Tesla 300Bs with cheap Chinese 2A3s from Angela--> I can't listen to the 2A3s (too .......
115: Bottlehead Forum, Question about Foreplay RCA output resistors (0.00)
Posted by tubefever on 2001-11-07, 05:21:24 (204.30.192.15)
How does varying the value of the 470K resistors on the output RCA's affect the sound? .......
116: Tube DIY Asylum, Re: Bottlehead Foreplay! (nt) (0.00)
Posted by tubefever on 2001-11-05, 12:48:55 (199.35.85.151)
Ditto .......
117: Bottlehead Forum, Re: Foreplay output caps (0.00)
Posted by tubefever on 2001-11-05, 12:16:38 (199.35.85.15)
My limited experience: Most cost effective upgrade: Solen fast caps, 3.0 mF 400V (or thereabouts-do a search for everyone's experience with different values) Best sounding?: Wide range of opinion on t .......
118: Bottlehead Forum, Re: Cheap preamp (0.00)
Posted by tubefever on 2001-11-04, 22:55:34 (199.35.85.48)
Why don't you buy the Foreplay manual from Doc (I think it's $10), then source the parts yourself--you can get lots of advice here about where to safely trim costs. I built an el-cheapo Foreplay in a .......
119: Bottlehead Forum, Re: Which SET? (0.00)
Posted by tubefever on 2001-11-04, 22:44:13 (199.35.85.48)
I have a Foreplay pre-amp and a AES SE-1 300B amp (both built from kits) driving 91.5dB 4 ohm speakers. Volume is NOT a problem--in fact, I have too much gain. The mids and highs are beautiful, detail .......
120: Bottlehead Forum, Re: Outboard Power Supply (0.00)
Posted by tubefever on 2001-11-04, 08:22:13 (199.35.87.153)
Thanks for your post. I plan to use AC on the filaments initially, then move to DC if needed. I was planning to bring the 6.3VAC through the same umbilicus as the PS DC, but it sounds as though you re .......
121: Bottlehead Forum, Outboard Power Supply Question (0.00)
Posted by tubefever on 2001-11-03, 04:38:56 (204.30.193.154)
In a previous post, I believe VS recommended placing the first power supply cap in the outboard power supply and the remaining two caps in the unit with the tubes, pots etc. Any idea why all 3 caps do .......
122: Bottlehead Forum, Re: Foreplay power supply buzz & Starground (0.00)
Posted by tubefever on 2001-11-01, 13:18:42 (204.30.192.131)
Thanks for your reply. I've been studying the posts on star grounds and experimenting with various schemas (i.e. signal path ground-->tube ground-->power supply ground-->chassis ground, etc). What do .......
123: Bottlehead Forum, Foreplay power supply buzz (0.00)
Posted by tubefever on 2001-11-01, 00:10:35 (199.35.86.95)
I'm building a second foreplay from scratch and have an audible buzz that seems to be coming from the power supply (the caps, resistors, or ground wires) rather than the transformer. I can hear it fro .......
124: Bottlehead Forum, Who makes WE 127 PIO caps? (nt) (0.00)
Posted by tubefever on 2001-10-24, 15:36:57 (204.30.193.54)
nt .......
125: Bottlehead Forum, Re: transformer cover for Foreplay (0.00)
Posted by tubefever on 2001-10-23, 10:43:55 (199.35.86.165)
Go to this site for info on transformer covers by Horace Atkinson. His contact info is on this site as well. Cost is ~$17.50 + handling. http://alexj.users3.50megs.com/hacovers.htm Cheers! ::: TOPIC:: .......
126: Bottlehead Forum, Re: Name of that <$100 sub? (nt) (0.00)
Posted by tubefever on 2001-10-22, 22:43:51 (204.30.193.60)
nt .......
127: SET Asylum, Re: Thanks (nt) (0.00)
Posted by tubefever on 2001-10-15, 17:04:46 (199.35.85.28)
SM .......
128: SET Asylum, Experience with Gabe's 300B (0.00)
Posted by tubefever on 2001-10-14, 02:52:23 (204.30.192.55)
Anyone have any experience with the amplifier kits at Gabe's Tubes n Stuff site? The 300B kit is $550. Wondering if this is a reasonable jumping in spot for a Newbie. .......
129: Bottlehead Forum, Re: Newbie Foreplay Chasis Construction (0.00)
Posted by tubefever on 2001-10-14, 02:08:41 (204.30.192.55)
My selector sticks up higher than the volume pots too. You can add a few washers underneath, or use a hack saw to trim the shaft a bit. .......
130: Bottlehead Forum, Foreplay Star ground (0.00)
Posted by tubefever on 2001-10-11, 13:57:12 (204.30.193.215)
I've been reviewing previous post/recommendation on star grounding schemes and am creating one in my scratch Foreplay. If my Foreplay is in a cigar box (the Don Diego Foreplay), then I have no chassis .......
131: Bottlehead Forum, Re: Cigar Box Foreplay (0.00)
Posted by tubefever on 2001-10-11, 12:58:34 (199.35.86.4)
Thanks for your suggestions. The cigar box Foreplay is now referrred to as the "Don Diego" (after the name on the box). Will post a pic once I get it grounded properly. .......
132: Bottlehead Forum, Grounding Problems in Wooden Enclosure (0.00)
Posted by tubefever on 2001-10-11, 00:37:27 (199.35.86.105)
I'm building a Foreplay in an all wood enclosure (all right, it's a cigar box). I've created a central grounding point by joining all the terminals on an 8 terminal strip and running individual ground .......
133: Tubes Asylum, Re: Foreplay+SS Amp (0.00)
Posted by tubefever on 2001-10-09, 20:47:57 (199.35.87.202)
My foreplay is stock with the exception of 2.2 mF Auricaps in place of the stock output caps. This made a BIG difference in sound vs. stock: richer fuller sound, more bottom end, deeper sound stage, e .......
134: Bottlehead Forum, Question about Anticipation and resistors (0.00)
Posted by tubefever on 2001-10-09, 14:44:49 (199.35.87.149)
In the Foreplay, which resistors does the Anticipation replace? I want to upgrade some resistors while I wait for my Anticipation to arrive (Anticipation anticipation), but don't want to order the one .......
135: Tubes Asylum, Re: Foreplay+SS Amp (0.00)
Posted by tubefever on 2001-10-09, 14:20:19 (199.35.87.58)
I was curious about the Foreplay with a solid state amp, so I plugged my Foreplay into a friend's NAD 350 integrated and bypassed the SS preamp. It sounded really good--more detailed, better sound sta .......
136: Tubes Asylum, Re: HELP selecting a tube amp (long) (0.00)
Posted by tubefever on 2001-10-09, 00:49:54 (199.35.86.232)
I second the above statement. Start with a Foreplay, you won't regret it. Build it stock, use it to drive your SS amp and your 87 dB speakers. You'll learn tons and enjoy what you hear. Then add a new .......
137: Bottlehead Forum, Alps (RS) 100K dual pot question. (0.00)
Posted by tubefever on 2001-10-07, 21:11:32 (204.30.192.170)
There are two terminals on the back side of the the RS 100K dual audio taper volume pot (i.e. opposite side from the three pairs of terminals I'm familiar with from my Foreplay mono pots). Anyone know .......
138: SET Asylum, Re: AES SE-1 compromise (0.00)
Posted by tubefever on 2001-10-05, 23:16:30 (199.35.87.124)
Thanks for your informative reply. I just finished building the SE-1 Signature about two weeks ago and have been running it with JJ/Tesla 300Bs. It sounds terrific compared to my old SS amp, but now I .......
139: SET Asylum, AES SE-1 compromise (0.00)
Posted by tubefever on 2001-10-05, 12:01:59 (204.30.192.51)
I am curious about previous posts suggesting that the AES SE-1 amp suffers because it is a 2A3/300B compromise. Is it possible to optimize this amp for 300B with transformer upgrades etc and get the " .......
140: Bottlehead Forum, Re: Helps a lot , as always ---->Supplemental (0.00)
Posted by tubefever on 2001-09-27, 00:15:01 (199.35.87.51)
A) Source for radial 220mF/200v electrolytic capacitors B) Source for 1/4W 1% resistors (I can only find 1/2W and higher). Appreciative, as always. .......
141: Bottlehead Forum, Foreplay rocker switch rating (0.00)
Posted by tubefever on 2001-09-26, 21:19:11 (204.30.193.174)
I'm planning to build a second Foreplay from scratch. On my last visit to Rat Shack I noticed that switches come in all different currents. Can anyone tell me the correct current rating for the Forepl .......
142: Bottlehead Forum, Re: AES + Foreplay (0.00)
Posted by tubefever on 2001-09-24, 16:01:16 (204.30.193.192)
I just finished Foreplay (stock) + AES SE-1 Signature (300B). They sound great together. The only hum I can hear with both units on comes from the SE-1, not the foreplay. Go for it! .......
143: SET Asylum, Re: Rational Upgrade Path? (0.00)
Posted by tubefever on 2001-09-24, 03:14:40 (199.35.86.242)
Thanks for your suggestions. Do you remember how sensitive your friend's speakers were? I have assumed that 2A3's won't be able to drive my Missions (91dB, 4 Ohm). .......
144: SET Asylum, Rational Upgrade Path? (0.00)
Posted by tubefever on 2001-09-22, 21:28:04 (204.30.193.120)
I'm very new to this. Have just built a Foreplay (stock) and an AES SE-1 Signature with JJ/Tesla 300B tubes. I'm enjoying wonderfully detailed and warm sound for the first time. I would love a bit mor .......
145: Inmate Systems, tubefever's Tubefever (0.00)
Posted by tubefever on 2001-09-22, 21:12:44 (204.30.193.120)
Audio Asylum Inmate tubefever's Tubefever System
Audio Asylum Inmate tubefever's Tubefever System
[ Audio Asylum ]
[ Speakers ]
[ Tubes ]
[ Vinyl ]
[ Digital ]
[ Ca .......
146: Bottlehead Forum, Electrical Wiring (0.00)
Posted by tubefever on 2001-09-20, 13:03:32 (204.30.193.12)
Just finished stock Foreplay and AES SE-1 Signature. The nearest electrical outlet is part of the old wiring in my house and has no ground. Anything special I should ask the electrician to do when he .......
147: Bottlehead Forum, Re: quick foreplay question (0.00)
Posted by tubefever on 2001-09-14, 03:54:59 (204.30.192.192)
I had a similar problem (see below --> Foreplay up but not running). Replacing the pot solved the problem. .......
148: Bottlehead Forum, Re: 2 issues here (0.00)
Posted by tubefever on 2001-09-12, 10:56:51 (204.30.193.227)
Thanks so much for your suggestions. I went for #2, bought a replacement pot, and now am up and running! Now if I could just get rid of that hum...... .......
149: Bottlehead Forum, Foreplay up but not running (0.00)
Posted by tubefever on 2001-09-09, 23:46:25 (204.30.192.162)
Is it possible to fry a volume pot on the first go? Just hooked up my Foreplay Rev 2 after checking resistances and voltages. There was a buzz (not too loud) from both channels, but when I switched on .......
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