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I hadn't realized that there was a change in the production of the 21AX... I had been under the impression that the change came after the 21CYP22. I haven't done any research myself, nor compared them, but I'm now curious! If anyone had said this in the past, I'd have said it was a result of the CTC-2 & 2B having the I & Q demod, and the CTC-4 & newer (except for the CTC-121, I believe), are R-y etc demod. Now that I think about it, I haven't ever worked on a 4... Are those I & Q?
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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