• 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.

Hum when ground connected

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Jockaruba

Jockaruba

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Joined 2011
Sheldon said:
Another thought: You have 4 electrolytic caps close to that resistor. It would be good to know how hot it gets in that area. A multimeter with a temperature probe would be useful here. If it were my amp, I'd want those caps are working-life rated at 105degrees - to be on the safe side. Were I building that amp, and that resistor gets hot, I'd either vent the area above that resistor, or mount the resistor top-side (with careful insulation of the leads, so no exposed conductors).

Sheldon
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Got it:flame:
 
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