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As Username1 mentioned, it very much sounds like poor DC restoration to me. I have a CTC-16 with pretty good DC restoration, and a CTC-16X that is rather lousy at it. Since I cannot see any major difference between the circuits of the two sets, I have figured that it may be something that can be adjusted to work better, perhaps with just the right amount of AGC, CRT bias, and setup of the three guns. Or, maybe swapping tubes would help? This is a "someday" project for me. My CTC-16X HV regulation seems fine, for what that is worth, and its DC restoration is not very good at all.
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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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