Quote:
Originally Posted by bandersen
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There has also been a loud hum since the start of this project. Some of that may be due to this super simple audio coupling design. Just a cap from the volume control to the grid and a 10M resistor to ground. Just bring my hand near that circuit increases the hum.
Wrapping the cap in grounded foil helps a little.
I'm going to recheck the tube to make sure there is no heater cathode leakage.
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Did you try reversing the cap? Hum pickup can be different depending on which end is the outer foil.