RE: The Dynaco SCA-35 is back!

Posted by Crazy Dave (A) on April 16, 2014 at 08:33:48

In Reply to: RE: The Dynaco SCA-35 is back! posted by mark.korda@myfairpoint.net on April 14, 2014 at 11:22:44:

I don't think it is all that controversial. I think there are few here who would doubt Frank VanAlStine's technical qualification or knowledge of Dynaco. I have one of his early Super Pass modification of a Dynaco PAS preamp, and it is very well thought out and executed.

By introducing the hum out of phase, they cancel each other out. It would be better to have a hum free circuit, but canceling it out is better than nothing.

7199's are rare and expensive. It is a fact for a lot of tube types. You can substitute a 6GH8A with a rewire or adapter, but they are getting harder to find too. There are also new boards that change the circuit to and ST35 type, but use more available tubes.

Dave

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Follow Ups Full Thread

Topic - The Dynaco SCA-35 is back! - mark.korda@myfairpoint.net 11:35:38 04/13/14 (16)

RE: The Dynaco SCA-35 is back! - BillH 08:51:11 04/21/14 (0)

Why? (nt) - briggs 05:11:49 04/18/14 (0)

I built an SCA 35 in the '60's and was sorely disappointed with it! - spindoctor 12:23:32 04/14/14 (2)

I don't blame you - 1973shovel 19:13:54 04/14/14 (1)

RE: I don't blame you - mark.korda@myfairpoint.net 20:17:00 04/14/14 (0)

RE: The Dynaco SCA-35 is back! - Crazy Dave 09:18:41 04/14/14 (2)

RE: The Dynaco SCA-35 is back! - mark.korda@myfairpoint.net 11:22:44 04/14/14 (1)

RE: The Dynaco SCA-35 is back! - Crazy Dave 08:33:48 04/16/14 (0)

RE: The Dynaco SCA-35 is back! - Brian Levy 06:24:15 04/14/14 (0)

Nice to see they're using Dave Gillespie's EFB mod for biasing - 1973shovel 13:24:43 04/13/14 (5)

RE: Nice to see they're using Dave Gillespie's EFB mod for biasing - mark.korda@myfairpoint.net 14:56:55 04/13/14 (4)

RE: Nice to see they're using Dave Gillespie's EFB mod for biasing - Flyquail56 15:39:22 04/13/14 (2)

RE: Nice to see they're using Dave Gillespie's EFB mod for biasing - mark.korda@myfairpoint.net 21:21:15 04/13/14 (1)

First - 1973shovel 06:43:31 04/14/14 (0)

RE: Nice to see they're using Dave Gillespie's EFB mod for biasing - Steve O 15:36:49 04/13/14 (0)

RE: The Dynaco SCA-35 is back! - fstein 12:23:00 04/13/14 (0)

Follow Ups

RE: The Dynaco SCA-35 is back! - Crazy Dave 08:33:48 04/16/14 (0)

RE: The Dynaco SCA-35 is back!

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