CTC-20C for the record

[Phil Nelson]

I'm guessing it won't require much work to have that looking good after you fix the cataract. Seems too nice to tear up for parts. I actually like the basket weave grille with vaguely Danish style legs. It's amazing what people use JB Weld for.

Not an expert on flybacks, but I recently used sensor safe RTV to coat a 1950s Philco flyback and it's holding up OK.

Phil Nelson

[old_coot88]

Any of you ol' RCA mavens remember that factory-issued field mod to the CTC-20 for weak vertical sync? It involved changing two resistors in the sync separator section. They were half-watters somewhere between 270K and 680K, IIRC.
Bill(oc)

[vintagecollect]

Interesting set,

I've seen old ads somewhere of $495 specials for lower end roundies. I doubt this was too thrifty, NICE cabinet quality. Dial and benzel very similiar to early RCA SS. This is a unique transition piece before ss.

DOES this have any ss components??? It only helps with reliability.

[marty59]

Originally Posted by vintagecollect

Interesting set,

I've seen old ads somewhere of $495 specials for lower end roundies. I doubt this was too thrifty, NICE cabinet quality. Dial and benzel very similiar to early RCA SS. This is a unique transition piece before ss.

DOES this have any ss components??? It only helps with reliability.

Not really except for diodes in the usual places: LV and B+ Boost rectifier, detector stages. But it does have a transistor in the UHF Tuner which had become standard practice by this time.

These sets were produced around the 1966 timeframe. This one that I have has date codes of 66-30 on the CRT and the tubes were earlier . The Howard Sams was published 9-66 as folder 837-2.

[ctc17]

My idea for rewaxing flybacks is to remove the tire, submerge the coils in a pressure cooker full of molten wax, put the lid on, pull the pot into a deep vacuum for a few minutes then slowly release vacuum remove lid and coils and let cool. That should get all the air out of the coil. Its basically how the factory does it.
I dont care if its dangerous, Ill do it outside with the proper protection.