2:90 preamp loud hum

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opauly

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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!
 
Yes! I am sorry for the title, it is the power amp. The 2:90 stereo simulator.
 
Thats ok. man ,I cud use much more info on your setup to try to help. Are you plugging guitar directly in the input of 2:90 on the back and using Instrument switch.... etc... A hum cud be 1001 things. try to tell me your signal path. Blessings. Jim
 

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