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If the picture doesn't change at all when this happens, it could be, maybe, a bad cap? A HV arc would have to make some sort of disruption in the picture, I would think.
I did have a late 70s Sears TV given to me and it worked fine except one of the caps was bad. The symptom was some sizzling and a mild burnt smell. I have had sets where a bad black beauty would let out a distinct "pop!" at regular intervals, as gases would be vented. I don't know that this set would use any of the old style caps, though. The closest maybe would be a ceramic-tubular (the infamous white El-men-co) but 79 seems late for that, at least from Sears.
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Bryan
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