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The negative leads went through the holes and were firmly soldered to lugs that are twisted and soldered to the chassis.
That aside, I've probed the supply rails with a scope and there is now less than one volt off ripple on them all. I also added extra filter caps around the chassis. No difference.
I also recheck the sawtooth deflection waveforms this afternoon and they are clean. No ripple.
That leaves two possibilities. One, magnetic. Two, ripple on some other element in the CRT. Like the HV supply, cathode or grid.
I'm focusing on the HV supply right now which is weird to put it mildly. It is also grounded in a rather crude manner with screws on a painted surface. I'm going to tighten them all down and do some more probing.
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