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Yeah, they licensed their technology. Sets vary from chassis RCA actually built, to chassis that look identical to an RCA, but built by someone else, to things that look similar but have a few different tubes, to some that might have an RCA circuit, but completely different layout.
Circuitry is very comparable between brands. Even among the brands who fiercely resisted this, and designed their own stuff, it is remarkable how similar most of the design is. Chroma demodulators show the biggest most obvious differences.
The CTC-15 is probably the most cloned thing on the planet. It truly is the textbook color TV set. Although a roundie, there are also a whole bunch of rectangular sets of various brands based on it too.
John
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