Quote:
Originally Posted by benman94
Would the 19VP22 be NTSC correct also? It was my understanding that they were, but I could be mistaken. ...
-Benny
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Unknown to me. However, a working one could be measured.
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Here's a laugh: the original patent on the sulfide phosphors touts not only their brightness, but claims that the restricted color gamut is an advantage because the tube cannot make extremely wrong colors! In other words, if you don't correct the reduced saturation (which everyone WOULD do by turning up the color), you can't see variations in transmission so clearly.
Also, there is a story behind the NTSC blue vs. the modern blue. RCA experiments with the triniscope used very pure primary colors, including a blue nearer to present sulfide blue. But sulfide blue is very sensitive to copper impurities, which turn it green. Therefore, RCA chose a different blue phosphor that was slightly toward cyan, but doesn't change due to presence of copper during the processing of the CRT. There is a futher confusion, in that it is not clear that RCA intended the cyanish blue to go into the NTSC specs - the color coordinates that ended up in the FCC rules look suspiciously like a typo.