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One thought on the HV regulation that only works without video issue: On my CTC-12 clone Silvertone, the HV regulator circuit has a lead (from it's control grid IIRC) that goes to the output of the luminance video amp through a high value resistor. I think that allows the video to have control over the HV, and if that line is bad on your set it could help explain the poor regulation with video present.
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