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Ditto on the capacitors. Around there they almost never get powered up until they are recapped.
Around 1940 Zenith used a lot of rubber coated wire which is hard, brittle and cracking now. Check for shorts. I have a '40 model on my bench now (8S563) that has rubber wire disease. I lifted one end of some of the wires and slipped shrink tubing over the entire wire. A few of them I replaced entirely.
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Summer's here and the time is right. 
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