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I've worked on quite a few of those, and I've always noticed that the AGC is very unstable. I remember that even when I worked on a few CTC-5s for the original owners in the early 80s. I think part of the problem is design, but new mica caps may help. RCA sets use those in the front end, and they're often shot. Actually, the reddish and brown "Micamold" ones often aren't even real mica caps... They're paper caps in a mica-looking package!
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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