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John, if reversing the yoke leads does not work, I wonder if you could try rearranging the yoke to operate in parallel, without the balancing cap? How does the inductance of the replacement yoke compare with the original? What Sams Photofact is your set in?
These RF HV supply sets for the 10" and 12" CRTs were oddball sets even in their day, and I suspect the Thordarson/Merits/Stancors of the day did not consider it worthwhile to make these low volume parts.
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John Folsom
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