RCA for sale - Chicago CL
 

Not affiliated, etc.

http://images.craigslist.org/3k63mc3...d2aed01435.jpg

http://chicago.craigslist.org/wcl/atq/1433365228.html

Nice! The face of the tube looks fairly flat... perhaps a metal cone CRT? 17CP4? :scratch2:

jr

I have one of these and yes it has the metal cone 17 inch crt.
-Tony

Chicago must have been a hot bed of TV action, I see more nice old sets for sale up there. I think folks down here that were born here were too poor, and the folks that moved here to retire left all their stuff up north.

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.

Could be.
Also, Admiral, Motorola, Sentinel, Zenith etc were all based in Chicago. Dunno if that had something to do with it or not.