• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Precision Fidelity C8 pre

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#21
I made a "cap stack". Now you have to get within 6 to 8 inches of the loudspeaker to hear any hum and hiss... and can barely hear it, even then (and I can only hear it because I am listening for it). 10K uf replaced by 5 X 2200uf bypassed.
 

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