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Can I build an amp with any of these?

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Posted on March 14, 2022 at 15:03:17
Paul Ebert
Audiophile

Posts: 42
Location: SE Michigan
Joined: February 25, 2002
I recently ran across the following NOS tubes in my father's basement:
- 2 Taylor T-40s
- 2 RCA 8025As
- 1 Lewis JAN-CYN-3C24
- 2 Sylvania 811s (not "a"s)
- 2 Ken-Rad 826s
- 2 Ken-Rad 832As

Sadly, my father is suffering from Alzheimer's, but I think it would be meaningful to him if I could put them to some good use. I know that they are more geared toward transmitting than audio, but thought I'd check before I look into other, non-audio uses.

 

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RE: Can I build an amp with any of these?, posted on March 14, 2022 at 16:58:58
Triode_Kingdom
Audiophile

Posts: 9424
Location: Central Texas
Joined: September 24, 2006
Very sorry to hear about your dad. I was a ham for about 50 years, and I also had a sizable collection of transmitting tubes at one time. Those numbers aren't too common in this hobby, but I'm sure they've all been used at one time or another. There's considerable "prior art" for the 811s.













--------------------------
Buy Chinese. Bury freedom.

 

RE: Can I build an amp with any of these?, posted on March 17, 2022 at 07:55:06
Paul Ebert
Audiophile

Posts: 42
Location: SE Michigan
Joined: February 25, 2002
Thank you. I think I'll see if I can find a 811 design I can build. It will have to be "newby friendly" and not too expensive. If I can't find such a thing, I'll check into selling them to someone into Ham or donating them to a museum or something.

 

RE: Can I build an amp with any of these?, posted on March 17, 2022 at 11:50:25
Paul Barker
Audiophile

Posts: 907
Location: North Yorkshire
Joined: November 17, 2002
oddly the 811 data sheet shows higher plate dissipation than the 811a.

the only way to use it in audio is positive grid bias so you would need low impedance reasonable power driver direct coupled. Not a newby project.

Hold on the them for a while as the valve world is in turmoil with the Russian conflict. When it settles possibly it may, and sanctions lifted perhaps the Russians will stop playing tit for tat and lift valve export ban. Also Ukrain was price best supplier of Russian valves, may not be any left after the conflict.

Hang tough and youre valves will sell better. A lot of ham's get their replacements from Russia/Ukrain so prices will rocket of youre valves.

 

RE: Can I build an amp with any of these?, posted on March 17, 2022 at 13:26:18
Paul Ebert
Audiophile

Posts: 42
Location: SE Michigan
Joined: February 25, 2002
That's good advice. Thanks!

When you say it's not a newby project, do you mean to design and build or to build an existing design? While I'd love to tackle the learning curve to be able to design an amp, I definitely recognize that's not something I am in a position to do. So, I'm hoping to find an existing design and reasonably accessible and affordable parts. It sounds like this isn't the right direction and/or time.

 

RE: Can I build an amp with any of these?, posted on March 17, 2022 at 22:40:57
Paul Barker
Audiophile

Posts: 907
Location: North Yorkshire
Joined: November 17, 2002
oddly the 811 data sheet shows higher plate dissipation than the 811a.

the only way to use it in audio is positive grid bias so you would need low impedance reasonable power driver direct coupled. Not a newby project.

Hold on the them for a while as the valve world is in turmoil with the Russian conflict. When it settles possibly it may, and sanctions lifted perhaps the Russians will stop playing tit for tat and lift valve export ban. Also Ukrain was price best supplier of Russian valves, may not be any left after the conflict.

Hang tough and youre valves will sell better. A lot of ham's get their replacements from Russia/Ukrain so prices will rocket of youre valves.

 

RE: Can I build an amp with any of these?, posted on March 18, 2022 at 22:51:47
Paul Barker
Audiophile

Posts: 907
Location: North Yorkshire
Joined: November 17, 2002
It's too steep a learning curve to understand enough to even build an existing circuit and parts costs high. The long answer is to big: I'm really sorry. But class A2 operation is like planning to climb Everest when all you're life you've lived in Holland.

 

RE: Can I build an amp with any of these?, posted on March 24, 2022 at 08:02:04
Paul Ebert
Audiophile

Posts: 42
Location: SE Michigan
Joined: February 25, 2002
Sounds like selling these and, perhaps, using the funds to build something easier would be in order? Or, are you saying that even that is too difficult for a newby? I've built a few solid state pre-amps and amps. My first job after getting a BSEE was as a controls engineer doing factory controls and automation, so I have some background with high voltages. Perhaps a kit?

 

RE: Can I build an amp with any of these?, posted on April 5, 2022 at 13:41:09
tube wrangler
Manufacturer

Posts: 2444
Location: USA
Joined: January 29, 2007
If someone has a schematic for the Altec 1570B,
please post it so this guy can see it. Thanks in
advance! -Dennis-

 

RE: Can I build an amp with any of these?, posted on April 5, 2022 at 13:44:44
tube wrangler
Manufacturer

Posts: 2444
Location: USA
Joined: January 29, 2007
Another amp that could be looked at, it's
fairly simple-- Nobu Shishido's Single-Ended
811A amp. Someone could post that schematic.

-Dennis-

 

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