Re: Buzzing all-tube amp... How to make it stop?
I also need help/advice. I have an ADA microtube 200 poweramp, it seems to have 2-12ax7 tubes installed. when running in bridged mono mode, there is an ever so faint hum, but i can live with it. when i try to use either channel. left/right in/out seperatley, or simultaniously, it has an enormously loud hum/buzz, 10 times louder then when using briged mode. Tried different cables cords/and speak cabs, all known to be good, tried them with another amp, no issues.. I was hoping it was a tube issue?? if it were a gound issue, whay louder buzz only in stereo mode, not when bridged?? any help appreciated..thanks, augie