Not an expert at bringing vintage stuff back to life but: 1st thing I would do is exercise the volume, balance, and tone controls many times back and forth (like 50 or so) with the unit off. I'd get some contact cleaner and clean those same controls. Those things get dirty for sure. I got a 1979 Yamaha R-2000 recently from my Brother and went through the same process and now it's much much better.
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