Anyone fixed a Gale GT2101 turntable?

Mine has a blown TIS93 or TIS91 (it's a bit hard to tell) General Purpose Amplifier on the motor pcb. It's a very rare bit of kit with approx 200 made back in 1975, so I wonder if anyone will respond. But I have to ask in case someone knows someone who's worked on one, or read about someone fixing one. The question is twofold ... 1. if anyone has fixed one of these motor/controller rarities, what was the fix? and 2. if anyone has fixed this particular bit (TIS91/93) then what bits upstream on the circuit might have caused this failure, and whats other bits downstream might also be blown because of the failure.