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RE: Tubes for Dynaco ST70 Clone with VTA Board

Posted by Lee of Omaha (D) on March 3, 2014 at 19:17:15

In Reply to: RE: Tubes for Dynaco ST70 Clone with VTA Board posted by slovell1 on February 28, 2014 at 09:45:50:

The center tube does voltage amplification duty for both channels. It is resistor loaded. The other tubes are in a constant current long tailed pair configuration with one of the grids grounded. It is the phase splitter/driver that connects to the finals. The center tube's topology is different from the other tubes' topology. The characteristics of the center tube's voltage gain will more audible than the splitter/drivers', since any common mode distortion will largely cancel in the output stage, and there's little or no gain in the stage. The 12BH7 requires more heater power than the 12AU7, but that probably won't be a problem.

Let us know how it sounds.

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