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Won't the yoke impedance be all wrong, as you can't use the smaller 17DRP4 yoke... You'd have to use a duodecal base type yoke, which will be 70 degrees max, if I'm correct, and won't match the Philco flyback and vertical output transformers. I'd get a smaller button-base tube, maybe a 12" tube out of a cheapie 60s portable, and then all you have to do is rewire the socket and feed it 6.3 from an outside source.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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