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I have had my bouts with interlace issues on RCA sets (some same models some fine some more critical on vert hold setting), I have read that the .001 cap often found from the primary lead of the vert out trans to ground (.001) is there to ground horz noise that works its way back from the yoke thru the transformer.
I know I had a BW maggie that had a real bad interlace issue, the sync pulse looked fine, the vert hold could not be set to get rid of it (like most sets). in desperation I switched the yoke, voila interlace issue gone. I cant recall the details that lead me to suspect the yoke (I was scoping stuff and some how noticed hash that seemed to be coming from the vert out trans).
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