Dynaco ST-70 mod

Tubes Asylum

Questions about tubes and gear that glows. FAQ

Hello!
I want to rebuilt my ST-70 and someone is kindly sent me a circuit diagram that is Sonic Frontiers SFS-40. The fellow highly recommended I adopt the whole circuit including the pentode output stage with regulated screen, and have 6FQ7 or 12BH7 for the driver, and he claimed that no needed to change the resistors and caps value that is supposed made for 6922. Is that true??

But I have no ideal about the B+ voltage for the driver and output section as well as the screen regulated voltage.

The output transformer will remain the same with Dynaco A470 but probably will have a much beefier power transformer for this rebuilt.

Thanks!

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Topic - Dynaco ST-70 mod - Audio Diamond 06:51:56 12/23/16 (11)

You have bigger issues that AC or DC filaments - DAK 19:02:40 12/23/16 (1)

RE: You have bigger issues that AC or DC filaments - Audio Diamond 04:26:59 12/24/16 (0)

Thank you - Uncle Mike 09:36:39 12/23/16 (4)

RE: Thank you - Uncle Mike 16:09:07 12/23/16 (0)

RE: Thank you - Audio Diamond 11:39:20 12/23/16 (2)

RE: Thank you - Eli Duttman 11:55:08 12/23/16 (1)

RE: Thank you - Audio Diamond 17:59:56 12/23/16 (0)

RE: Dynaco ST-70 mod - Mick Wolfe 08:47:53 12/23/16 (0)

How much experience do you have with building amps? - DAK 08:15:08 12/23/16 (2)

Yeap - airtime 10:10:53 12/23/16 (1)

RE: Yeap - jsblock 15:24:36 12/23/16 (0)

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