Unknown remote chassis
 

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Sams shows a CTP12a which is used in a CTC28. It could have been used in the CTC40, which was RCA's first solid state set. With all those relays on it, it had a lot of functions.

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There isn't that many of the CTC28's around. It was a very pricey model at the time.
IIRC, it had a separate indicator lamp for each channel. Of the two I worked on, neither was a remote. To locate all the motors and special parts would be an extreme undertaking.

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I replaced the CRT in a remote CTC31,which was a lower end model at the time. I don't remember how many functions were on it. The remote transmitter was a transistorized ultra-sonic one. I had to send it to PTS for repairs, as a new one was NLA.

I had a CTC21 (another rarely seen expensive one)and it had a remote chassis, CRT and escutcheon that had lots of functions, including color and tint motors.
I never had the transmitter, so I did not try to make it work. It was removed from a combo that our shop refitted with a "new RCA 25" in 1981. I fitted the whole works into another cabinet and we used on a cable box, so there was little need for remote functions.

Maybe one of my RCA color service manuals by Carl Babcoke mentions it.

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Remote receiver
 

See the attached schematic.
This is probably similar to most RCA remotes using the 7-button transmitter.
Attachment 174685