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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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Old 17th January 2019, 04:33 PM   #151
rpi is online now rpi  United States
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Location: San Francisco
carlthess40, this is the main thing that you like it I needed a tube amp kit for my project. The discussion went in such a way that the new kit was eventually developed
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Old 17th January 2019, 04:58 PM   #152
carlthess40 is offline carlthess40  United States
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So you want one that you can build? Ok sorry. I got this one as it was turn key and has a turntable input and I can roll the tubes if I want to play with the sound
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Old 17th January 2019, 05:33 PM   #153
rpi is online now rpi  United States
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I'm trying to collect in one place the info scattered across multiple pages. Here is the final schematic for PS and the parts list.

Click the image to open in full size.
Code:
T1 - Triad N-68X
https://www.mouser.com/ProductDetail...L%252b8cFew%3d

T2 - Triad VPS24-1000
https://www.mouser.com/ProductDetail...Tv9IKwPkmq4%3d

T3 - Triad C-24X
https://www.mouser.com/ProductDetail...d8wC%2FQ%3D%3D

V1 - OA2
1PCS - SYLVANIA OA2 / 0A2 ( OA2WA / 6626 / CV4020) Vacuum tube NOS   | eBay

C1 - 0.01uF 2000V
https://www.mouser.com/ProductDetail...5IIgJQNHda0%3d

C2 - 20uF 400V
https://www.mouser.com/ProductDetail...oW0GsUvVneI%3d

C3, C4 - 180uF 250V
https://www.mouser.com/ProductDetail...PmyizGVpPNg%3d

C5 - 82uF 400V
https://www.mouser.com/ProductDetail...4uFjDxRrTxw%3d

C6 - 0.068uF 400V
https://www.mouser.com/ProductDetail...Tme4nl3ONOM%3d

D1, D2 - UF4007GP-TP
https://www.mouser.com/ProductDetail...DaoGuk%2f10%3d

L1 - CL-140 Inrush Current Limiter
https://www.mouser.com/ProductDetail...252bQtFpb38%3d

 R1, R2, R3, R4 - ?
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Old 18th January 2019, 06:31 AM   #154
rpi is online now rpi  United States
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Here is the amp schematic and the parts list:

Click the image to open in full size.
Code:
T1 - GXSE15-5K
EDCOR - GXSE15-8-5K

V1 - 12AX7
Sino 12AX7B Preamp Vacuum Tube  | eBay

V2 - 6P15P-EV
6P15P-EV 4Pcs Russian Military Long LIFE Vacuum Pentode tube OTK same year EL83  | eBay

C1 - 0.082uF 400V
B32642B6823J EPCOS / TDK | Mouser

 C2 - 0.1uF 400V
https://www.mouser.com/ProductDetail...FMB1%252bC8%3d

C3 - 680uF 16V
https://www.mouser.com/ProductDetail...B5OPpYC2i4g%3d

C4 - 180pF 1kV
https://www.mouser.com/ProductDetail...7PmGGS9GNQY%3d

R1 - 100 kOhm 0.5W
https://www.mouser.com/ProductDetail...m%252btXr3E%3d

R2, R12 - 100 Ohm 0.5W
https://www.mouser.com/ProductDetail...pM5jfX%252bQnA

R3 - 820 Ohm 0.5W 1%
https://www.mouser.com/ProductDetail...wSsVuz94HuQ%3d

R4 -150 kOhm 2W
https://www.mouser.com/ProductDetail...WZR%2fBAcb0%3d

R5 - 100k 5W wirewound 
https://www.mouser.com/ProductDetail...j8xqXsZy2zA%3d

R6 - 150 Kohm carbon film 1W
https://www.mouser.com/ProductDetail...AE%2fkNyxUU%3d

R7 - 220 Kohm carbon film 1W
https://www.mouser.com/ProductDetail...IToe7QaFR9Q%3d

R8, R10 - 10 kOhm 0.5W
https://www.mouser.com/ProductDetail...pDzGU6krlXY%3d

R9 - 470 kOhm 0.5W
https://www.mouser.com/ProductDetail...LdhjO%252bM%3d

R11 - 150 Ohm 0.5W
https://www.mouser.com/ProductDetail...MLMQDudKPvZ1vl

Recommended speakers 3" 8 Ohm 91 dB:
https://www.parts-express.com/faital...83&PID=7598510
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Old 18th January 2019, 09:34 AM   #155
Eli Duttman is offline Eli Duttman  United States
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There are errors in the signal BoM.

R1, R9, and R12 should be metal film, not carbon film.

R2 and R10 should be carbon composition. Use this and this.

A 0.1% tolerance part for R8 is costly overkill. Use this. The price is nice and KOA/Speer's reputation is solid.

A 1/2 W. rated part is cutting things too fine, for R11. Use this. "Better to be looking at it, than looking for it."

To put it mildly, coupling caps. are a subject of considerable "debate". With some exceptions, my preferences are discrete polypropylene film/metal foil and Soviet surplus K40 paper in oil (PIO) parts. Polyester exhibits some electrical quirks and (for the most part) metalized film is "meh". This part gets my nod for C2. We now come to subject of C1. Polystyrene is easily as good electrically as polypropylene, but it's heat sensitive. C1 is not nearly as thermally "exposed" as C2. So, this is what I suggest for C1. Don't loose sleep over the WVDC rating. Plate to grid shorts/arcs in small signal triodes are RARE occurrences.
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Old 18th January 2019, 10:24 AM   #156
merlin el mago is offline merlin el mago  Europe
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For C2 I will go for FT-3 0.1uF 600V teflon aluminium foil
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Old 18th January 2019, 01:42 PM   #157
Eli Duttman is offline Eli Duttman  United States
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That will work, but expect a lengthy "run in" period.
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Old 18th January 2019, 07:05 PM   #158
rpi is online now rpi  United States
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Are there any nuances regarding tube sockets? I need one 7-pin (OA2) and three 9-pin (12AX7 and 6BQ5). I believe the latter fits both tubes.
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Old 18th January 2019, 07:27 PM   #159
kodabmx is online now kodabmx  Canada
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Not really. Buy Belton sockets if you want to. Personally, I fine Chinese sockets work well enough if you don't do a lot of "tube rolling", but I prefer NOS Soviet parts.

7 pin: 10PC 7PIN B7A Chassis Mount Vacuum Tube Sockets For 6Z4 6J1 6J2 6J5 6X4 6K7 EAA9 | eBay

9 pin : 9 Pin Vacuum Tube Sockets For 12AX7 6DJ8 5670 EL84 ECC83 Bottom Chassis Mountx10 | eBay

I find GDparts to be reputable. Never had any issues, but of course you might want to buy them from the USA instead of China.

If you like, I can sell you the 4 sockets you need to save you money. I should be able to mail them to you for 10$ inclusive depending on the weight an size of the pack.

Last edited by kodabmx; 18th January 2019 at 07:29 PM.
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Old 18th January 2019, 07:46 PM   #160
Lingwendil is offline Lingwendil  United States
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Need 3-5W tube amp
I get by just fine with the chinese ceramic sockets. I tend to stay away from teflon ones however, I've had them loosen up fast.
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