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RCA used the 17CP4 in some of their sets. I have a bakelite Admiral table top set that uses a metal CRT, which I also believe to be a 17CP4.
In addtion, I have a Hoffman table top that uses the 17TP4, another metal CRT. It was difficult finding a good tube for this set. The same model also uses the 17HP4(with a slightly different front bezel), which is easier to find.
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