(Derived from the Super Twin Reverb schematic)
This one was originally a combo with a 15" speaker, manufactured by Fender around 1977-1980. All I got was this badly mistreated chassis, which must have been used as an underwater amp...
One switch missing, one broken; no knobs, rusty transformers and some visible "repair attempts".
I turned it into a "Super Bassman" head with 180 Watts output and switchable 5-band EQ. Very pleased with the result.