Without seeing a schematic of your amp all I can do is venture a guess. Some SET amps have outputs that are capacitively coupled to your speaker. The capacitor is there to keep DC of of your speakers. It could be that this capacitor is breaking down. If you are witnessing this in both channels the problem is probably a bad or breaking down power supply filter capacitor. This problem is consistant with the Hum you are hearing also. In either case you are risking damage to your speakers and or amp by using it in this condition. The repair is pretty straight forward but I recommend a pro doing the job if you do not feel comfortable as a faulty repair can do much more damage than you care to deal with. Best of luck and I hope you enjoy your amp for many years to come after it's repair.
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