Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: AHeck on October 14, 2019, 08:26:33 am
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I just brought up my first guitar amp build, it's a 5E3, and I'm very happy with it except for the one last ground demon I can't get out. It lives in the tone pot. First things first, I had wanted to use an Alpha amp pot with SPST switch in one of the volume positions for a power switch, but ended up with a SPST toggle as power, and I ended up using it for the tone pot, I don't really know why. Anyway, I have the tone pot ground connected by a Mallory .0047uf cap to a ground chain to both volume pots and then to a four input conglomeration. I don't even need to touch the pot, just hold my hand over it and the hum is gone, but when I do try to touch it, there are crackling and poping noises. I'm not an expert, but it sounds like 60cycle. I've tried taking the pot ground to chassis, but it makes it a signal attenuator. No grounding point I could find reduces the noise, but a bunch of them made it worse. So what do I need to do, besides change out that pot when it arrives tomorrow? At this time I'm also trying to straighten resistor values out to zero in on voltage points.
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When i soldered pots to smithereens they did the same.