I just finished building a custom amp based on the Valve Junior, but with switched components throughout the signal chain and at the cathode bypass caps. It works, but I have a low 120Hz hum that is independent of the signal volume. I think I've traced the problem to the power supply - the bleeder resistor may be allowing some unfiltered rectified current through to B+?
Would moving the bleeder to the cap for the screen grid current fix this?
Peter
Would moving the bleeder to the cap for the screen grid current fix this?
Peter
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