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Not only were there close similarities among all the RCAs and RCA clones, but basically, the circuit didn't change much all the way from 1957 (CTC-5) to the last RCA console tube set in the early 70s (CTC-39).
Zenith was always their own design, maybe because of the lawsuit from Sarnoff about the prototype Zenith color set in 1953 with a counterfeit 15GP22. But even that set; a chassis 43M20, was a pure Zenith design (except the aforementioned stolen tube). Zenith didn't come out with any color set for another 9 years (29JC20Q), and that one used an RCA design tube.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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