2:90 preamp loud hum

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opauly
Bottle Rocket
Posts: 8
Joined: Thu Apr 04, 2019 12:36 am

2:90 preamp loud hum

Post by opauly » Thu Jun 06, 2019 5:23 pm

Hello!
My 2:90 preamp is having a loud hum in channel A. Channel B does not have it. I already tested all tubes (with a tube tester) and all are fine. Hum goes away when guitar is unplugged, but in that case why is channel B not having that loud hum?

Thanks!

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