Does anyone know what sets use these metal CRTs? They are all NOS, total of 6 tubes.

17CP4 (3)
17GP4 (2)
21MP4 (1)

John:

Sone of the '51 and '52 Motorolas used the 17 inch metal tubes.

Steve

My Silvertone uses the 21MP4
-Tony

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.