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I have two of these. One has a 17CP4 metal cone tube and the other has all glass tube. Seems they made both kinds.
One interesting item about the RCA shown is that it uses the limiter-discriminator system for sound detection, not the typical ratio detector used in RCA tvs at that time. I know that, at the time, RCA and Howard Armstrong were in a patent fight over FM sound detection(Howards widow won later according to PBS documentary). I wonder if the decision to use the limiter-discriminator was related to the fight.
I also have 17 Hoffmans sets that mix CRT types, even though the chassis the same. Some use the 17TP4 metal cone tube and some use the 17HP4 all glass tube. I restored 3 of these. I had to find a new 17TP4-it was not easy. The 17HP4s were useable as found. The front bezel is different for the 17TP4 (flatter screen) and the 17HP4.
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