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No, it's actually a standardization that was forced on NBC/RCA after they'd been using color tape for about 2 years.... as is their wont, NBC's engineers had been making tweaks to the color system, and eventually the FCC put a stop to it, saying they had to use exactly the same specs as everyone else.
That's why NBC tapes from that era require a specially-modified color module to really decode properly. I saw one of the modules, just last week. And I might add, when you see one of those tapes properly decoded, it's amazing!
The Astaire tapes (and the rights surrounding them) are a story unto themselves, from what I've been told...
-Kevin
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