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When was the RCA 21AXP22A in use?
Hi, new member here. I'm cataloging the television collection at the Henry Ford Museum, and we have a 21AXP22A in the original box. The original cataloger claimed a date of 1940-1949 for this tube! I have found references to it in 1956-1959 RCA televisions, but I'd be grateful if someone could give me a better set of dates during which this tube was put into new sets. Thanks!
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