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I think a new or rebuilt tube would probably help your situation. I don't think one would be too hard to find. I've seen plenty of those RCA's from the early '70's and they had (to me) great pictures provided the tube was good and everything was set up properly. Also, if that set has "instant on"; you may want to have that feature disabled. Instant on is a circuit that keeps voltage on the CRT filament even when the set is off. This eliminates warm up time but often decreases tube life. I've seen several of the early XL-100 modular sets with the "instant on" feature that had dead CRT's.
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