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Sylvania rebuilt tubes were classified as "new gun" or "new gun and screen" so I think a lot of rebuilt tubes , B&W and color, were just equipped with new electron guns.
I really have not seen the kind of phosphor burn you get on old computer terminals on many TV crt's, except in sets from college student union lobbies or motel lobbies, etc. where the Weather channel or cable TV info channel played constantly for many years and burned text into the screen.
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