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I want to say that the unit hasn't been plugged in for years and a capacitor caused the resistor to overheat. Often after some time working capacitors will reform and work normally if they don't short or take out something expensive like a transformer. The best thing to do in all cases with old equipment is to bring them up in steps with a variable voltage source.
A Variac or equivalent and an isolation transformer are a must if you are going to work on electronics old or new.
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