Hello. I have some problem after repairing my sherwood ax 5090r amplifier. both channels were burnt and i replaced both of them, one channel with original output transistors (sanken 2sc3857 and 2sa 1493) and another channel with replacement-pmc 2sc3858 and 2sa1494 (becouse that 2 wast last original i could find availible in my country). Except output transistors, i replaced all other transistors with same types as original ones (from schematic). My problem is that the channel what i repair with original output transistors is now in great condition, sound nice and clear but the other channel (with replacement transistors) sound very distorted. Mu question is did i need to change drive transistors too or adjust idle current on thah channel (there is no bias adj. pot btw) or there is something else the main problem?
Thank you
Thank you