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Is there a Clean Complete ST-35 Schematic Somewhere

Posted by MrThrash on June 21, 2003 at 11:23:43

I've been playing with a Stereo EL84 PP amp from a DuMont console. Amp uses 12AX7 for input/tone controls and 12au7 for driver.

I have bypassed the tone controls and now am inputting straight to the driver stage. Gain insufficient, gotta kick the preamp way up. It does work and sounds great. I tried reducing (even eliminating) the NFB loop to increase gain. That works, but this one seems to play best with the original amount of NFB.

I am thinking of going to an ST-35 style arrangement, but instead of the unusual driver tube (7247 I think), I would like to use one 12ax7 and one 12au7, each tube handling left and right channels. Electronically, I think that is the equivalent of a ST-35.

Problem is, I can't seem to find a legible schematic on the net. I dont think Sam's photofacts exist for Dynaco.

Any thoughts on this faux ST-35 or where I can get the schematic?

Thanks

Jim

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