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Bob-
Thank you for the interesting and detailed notes about the CTC-4 versions. My Gainsborough is #B8082343. The tubes that are likely originals have white RCA labels and date codes of 5-43, 5-48, 5-52, and 6-04; more than half of its tubes were replaced over its service life with red-label RCA tubes with two-letter date codes in the 1959 to 1965 range, plus a couple of GE tubes with 1965-66 date codes.
I would be very interested to know how many of each of the five models still exist, out of the total number of surviving CTC-4s.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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