I have one of these amps to repair.the problem is there is a short between the first and the last legs on the output transistors. I removed all output transistors and a few shorted tip42. And I removed the rectifiers. There is a short between the second and third leg.
That's not a short. If you look at the components, I think you'll find a 22 ohm resistor connected between the traces that go to the base and emitter of the output transistors.