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In Reply to: RE: ST-70 Output Tubes posted by Tre' on August 12, 2021 at 10:18:43:
Mike Samra was a big advocate of using a 6L6 in VTA's version of the ST-70 (link to but one post, below).
I put their (stuffed with parts by me) 12AU7 board into one of my ST-70s years ago, and was never in love with it. I describe the sound as "too solid-stateish" and have been told by more than a few that the non-linear 12AU7 was the prime suspect. I tried 12BH7s, but that was largely a lateral move.
After reading Mike's frequent recommendations, I bought some 6P3S-E from Jim McShane, back when he still sold them. I'm not going to claim the amp was "transformed", but it certainly was a bit more pleasant to listen to music with than with the (original but used) Mullard EL-34 or reissue Gold Lion KT-77 I tried.
I'll leave it to those with more circuit knowledge than me to explain it (Canceling distortions? He asks, very tongue in cheek) but whatever it was, I liked the VTA better with the Soviet 6L6 variant.
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Follow Ups
- Not only him - 1973shovel 07:52:04 08/13/21 (28)
- RE: Not only him - Tre' 10:00:32 08/13/21 (24)
- Thank you Tre' - 1973shovel 06:07:18 08/14/21 (1)
- You're welcome. nt - Tre' 17:50:52 08/14/21 (0)
- RE: Not only him - Triode_Kingdom 17:58:09 08/13/21 (21)
- No I haven't.... - Tre' 17:52:40 08/14/21 (0)
- I'll be anxious to hear his reply - 1973shovel 06:09:11 08/14/21 (19)
- RE: I'll be anxious to hear his reply - Triode_Kingdom 06:40:26 08/14/21 (18)
- All good points - 1973shovel 08:14:55 08/14/21 (17)
- RE: All good points - Tre' 18:25:44 08/14/21 (15)
- "Don't tell anybody" - 1973shovel 05:24:29 08/15/21 (14)
- RE: "Don't tell anybody" - Triode_Kingdom 07:15:54 08/15/21 (2)
- RE: "Don't tell anybody" - PakProtector 16:37:56 10/25/21 (0)
- "Wish I had bought a dozen of these" - 1973shovel 04:46:55 08/16/21 (0)
- RE: "Don't tell anybody" - Tre' 06:32:28 08/15/21 (10)
- "There's more to life than money" - 1973shovel 05:01:00 08/16/21 (9)
- RE: "There's more to life than money" - Tre' 08:39:54 08/16/21 (8)
- Nice - 1973shovel 03:24:18 08/17/21 (1)
- RE: Nice - pictureguy 16:45:11 11/04/21 (0)
- Very Cool! - Triode_Kingdom 09:46:16 08/16/21 (5)
- I'd say that is a great story - 1973shovel 03:39:12 08/17/21 (3)
- RE: I'd say that is a great story - PakProtector 08:11:10 08/17/21 (2)
- Sounds like fun (nt) - 1973shovel 08:10:36 08/18/21 (1)
- RE: Sounds like fun (nt) - PakProtector 08:47:06 08/26/21 (0)
- "12 degrees" somehow that doesn't sound like fun. nt - Tre' 09:53:25 08/16/21 (0)
- I like that idea! nt - Tre' 17:55:06 08/14/21 (0)
- FWIW, mineuses the 12AT7 . Bob recomended the KT66 - artemus 09:50:17 08/13/21 (0)
- But... - airtime 09:10:37 08/13/21 (1)
- "he must have" - 1973shovel 10:44:53 08/13/21 (0)