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RE: Cathode bypass...

Doesn't the LED make it necessary to hand-select the tubes? With a constant voltage device at the cathode, bias current will be controlled by tube-to-tube variations, rather than the self-adapting curve created by a cathode resistor. I don't use unbypassed SS devices in tube circuitry, but even if I did, this would be something I would avoid. It also needs to be understood that if the cathode capacitor is sufficiently large so that the cathode has no detectable AC voltage, the capacitor cannot be responsible for coloring the sound. Coloration requires waveform modification, but that can't happen if no signal voltage is present.
















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