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Quote: "The HV rect tube is a RCA 3A3C the chart calls for a 3A3A....I seem to recall once reading that some variants of that tube caused arcing in the CTC-16, but I can't recall it exactly or find it....Could that be the cause?"
There seems to be some variance in the height of the tube(s) and the "C" versions may be somewhat shorter, causing issues with the tube contacting the top of the flyback. There should be enough slack/adjustability in the top cover as it sets in place but good to verify.
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