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Wayne, Not sure exactly what time period you refer to, but assuming it was post 1950, then it seems likely that it would have used a 5TP4 or 5AZP4 CRT, as this is what RCA was making. Of course, as the screen got bigger, the image got dimmer. And the projection CRT at the museum may well have had lots of hours of run time on it. The 5TP4 suffers from considerable dimming with use.
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John Folsom
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