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#1
10-05-2021, 02:50 PM
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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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#2
10-05-2021, 04:27 PM
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Marshall,
The Cover Girl screen photos are fantastic. Much more viewable than the previous photos w/the somewhat distracting lighting reflections. This, IMO, is the way to showcase the Westy. Thanks for sharing. -Steve D.
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Please visit my CT-100, CTC-5, vintage color tv site: http://www.wtv-zone.com/Stevetek/
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#3
10-05-2021, 07:06 PM
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15GP22 mask transmission 14%
Later tubes (of any type including Trinitron) mask transmission ~ 25% Ratio 1:1.8 15GP22 area: 88.5 in^2 21 inch round tube area: 255 in^2 Current per unit area ratio: 2.88:1 Brightness ratio (15G 14% / 21 inch 25%), all else equal including beam current: 1.6 So the larger tube had a 38% deficit compared to the 15G, operated at the same beam current.
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