The 1992 Reissue of the original '65 Twin Reverb. Different from the older model, the reissue is built with a printed circuit board and 1/4 inch footswitch phone jacks. This model features blackface cosmetics and 12'' Jensen speakers.
Bob Lenhardt, could be caused be a bad amplifier IC as well as bad caps. I suggest to disassemble it and to take a good look at the PCB and check for the obvious, like bad caps.