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Wayne, thank you for the updated information. Did color television phosphors exist prior to the 15GP22? Prototypes only right or no? We’re they used by the military prior to color television? I did not dispute the inefficiency of the three primary color phosphors used in the 15GP22, but I believe the design of the original shadow mask used in the 15GP22 was largely responsible for the brightness issue. From RCA’s own technical published paper, the 15GP22 blocked 86% of the electron light and was only 14% efficient. The original shadow mask was horribly inefficient.
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