Got one!

[Electronic M]

Originally Posted by jhalphen

Hi to all,
Hi @Penthode,

wouldn't a CTC-2 (original CT-100 chassis) need important modifications to drive a 21" roundie (21AXP22, 21CYP22,...) ?
More H deflection power, more EHT (21 kV instead of 19kV), different Focus voltage and much more sophisticated Convergence controls.



Best Regards

jhalphen
Paris
France

RCA sold a factory CTC-2 chassis that was modified to drive a 21AXP22 (and compatible with the all glass types) the CTC-2B (combined with the CTC-3 convergence sub-chassis) found in the 21" RCA 21CT55....Which was basically an emergency stop gap between the CT-100 and CTC-4 to deal with the 15GP22 being obsoleted by larger tubes.

I highly doubt a rarer (and IMO better) 21CT55 got scrapped to make a franken CT-100.
It's likely the OP bought that cabinet that was gutted and stuffed with a BPC.

I've mentioned this before in various topics, but you can drive a color test jig off a CT-100 (I recently saw someone do so in restoration photos)...If I had a CT-100 with a bad CRT what I would do is look for one of the first 13" inline test-jigs sold to repair shops that still supports tube sweep chassis, but doesn't require dynamic convergence signals, then build a faux CT-100 inner mask to improve the illusion....It ain't as good as a real 15G but anything that allows you to experience the original chassis in operation is an improvement over a full gutting and installation of a BPC.