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Rob,
Sounds like you have further shorts in your radio. Replace all bypass caps and in particular paper caps in the audio output stage. Look for shorted wires, or obvious signs that there's a short circuit. A short in one of the tubes would cause a problem too.
Sounds like the short is drawing too much current through the field coil causing it to overheat. Let us know what happens when you get the caps changed out.
Gilbert
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