In Reply to: RE: preamp with paralled outputs degrading audio posted by Eli Duttman on September 16, 2014 at 18:56:32:
Something is wrong with the the schematic values. Looking at the lower version, the second 6SN7 triode can't possible be carrying 7.15 mA of quiescent current. That would produce 326V across the 47K cathode resistor, a physical impossibility considering B+ is only 250V. Maybe the "7.15 mA" notation is intended to represent combined current into both triodes.
Anyway, I SPICEd the lower circuit just for grins. With a 20K load (in addition to the 100K shown), the output clips at better than 30V pp. You might be right about the Behringer, Eli.
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- RE: preamp with paralled outputs degrading audio - Triode_Kingdom 19:50:00 09/16/14 (0)