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The Development of Color Television -- 1956 RCA Film
I'm quite certain this has been posted about before, but I never tire of watching it. Definitely looks like a CTC-4 at the end. The 21AXP22 shown at 2 minutes, 20 seconds doesn't have the red aquadag, so it's an earlier tube.
https://www.youtube.com/watch?v=WIFMVcIZSJM |
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