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Sorry to hear it seems to be your vertical output transformer. It appears the insulation breaks down inside the transformer and if you look at the circuit the convergence winding is nearly at ground. The plate voltage punches through the insulation and it’s all over. I have cut apart a few of mine that have failed and that is what happened. New transformer and all is good again. I think this part is going to prove to be a week spot on early Zenith color if the set was stored in a poor environment.
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