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I think that set has one of those inline IC chips for the vertical outputs, and I've seen those go intermittent a lot, but they act more like a cracked solder connection (popping in & out of full sweep) ; not so much just gradually shrinking or slowly changing as the set warms up. But they're cheap, so it might be a good shot to try it. I don't remember which version it would be, but it might be LA7838, or if not, LA78(and two more digits) .
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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