I will try all of the inputs and the outputs before I pop the top...I'll keep you posted. Much Thanks...Neil
HELP high pitch whistle from tube amp
I have a unison unico with lv 2 underwood mods. Theres a very high pitch whistle from the left channel that remains constant through the volume range and input selects. Could this be ground loop issues? Or defective tubes? Outside of this recent glitch this amp is just glorious! Any advice much appreciated.