Cant say i’ve had that particular problem, except for gain. This makes me think i have a problem in my preamp section.
I wish i could switch out tubes for 2 of my amps. But they got EXPENSIVE, especially cause i favored Sovteks cause they used to be the cheapest. Also all my amps are Sovteks so i thought it was funny
Meanwhile those who really know see 3.5e V3