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Apparently it's not getting in through the video signal. I had a very similar situation once on a Setchell Carlson portable. After a whole lot of head scratching the cure was to put a big B+ bypass cap very near where B+ supplied the horizontal oscillator or amp section. Never did figure out why it needed extra filtering other than there was apparently some AC ripple formed between various grounding points. That chassis was aluminum with the grounding points riveted to it.
Last edited by Kevin Kuehn; 01-12-2021 at 05:37 PM.
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