Erly 80's Bassman 120 solid state scematic needed

[jvm]

Can't find much on this one. Early 80's Fender Bassman 120 solid state amp. 1 x 15 combo. Works fine other than a hum that I can't track down. A schematic would really be helpful in signal tracing. I have replaced all elctrolytics, cleaned all grounds, cleaned all pots and jacks. I have subbed new output transistors with no improvement.

[doctor]

I have schematics only for one solid state combo 15' Bassman manufactured in 1982.
But it is "Compact" model, not "120".

[Steve A.]

Do you have a full model number from the back of the unit? It might help track down the schematic.