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The electrolytic did not measure shorted, but one of the resistors biasing a 6V6 was burned open. Several others left burn marks on the chassis above. Makes me wonder if the output stage was drawing excessive current causing the 5Y3 failure?
Anyway, it's working for now. Also, the reality is that the TV museum does not have sound on its closed-circuit signal course. Reason being they don't want people fooling with blasting sound out of the sets. So we might just leave this amp unplugged once it's on display.
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