1967 Zenith table set with 25NC37 Chassis

[dieseljeep]

Originally Posted by drh4683

Ah, yes! Those were the big post-deflection purity rings! Zenith did it that way on the M and N line 23" sets. Very large and bulky apparatus and was secured with heavy copper braided cables that curved around the bell of the CRT. An unusual approach to purity adjustment. Not sure why Zenith did it that way in the beginning as I think the rest of the industry was using the much smaller and simpler purity ring assembly at the end of the tube.

I thought it was for purity adjustment.
I didn't know, that there was an "M" chassis 23V rectangular set, just the "N" models.
I know, that RCA had a CTC17E chassis, that was their first 23V set. It had the same control panel as the CTC16E roundie. Most of them, didn't have that great of a picture and had purity problems.