Until somebody finds a schematic:Torque amps in general were very simple , which is good in this case.+/- 40V raikls or so, 4 2N3055 or similar driven by a pair of TIP31-32 class transistors, etc.
Post a couple close up pictures showing the power amp section, check power and driver transistor shorts, open emitter resistors, turn it on plugged into a bulb limiter, no speaker or any other load, start measuring voltages.
For starters +/-V rails and speaker out.
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