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I was reading about this I think in an issue of the PF reporter that this was caused by a resistor that has gone up in value. It was quite a while ago so I dont recall where though. My 17" Crosley has this but not as heavy though.
Seems like it was in the video or horizontal oscillator circuit. Have you checked the carbon resistors? You might have one that drifted, especially the high value stuff 470K and up.
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