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No, it was actually out of circuit. It still measures the proper value, and had a decent charge on it when I went to discharge the CRT... got two separate snaps, one from the picture tube anode, and one from the corona ring attached to the 'knob.
I put it back in to see if it would help any. Picture is maybe a little stabler, but still jittery and shifts left and right a bit. There's also no more discharge from the HV lead to the corona ring on warm-up, since it's now at the same potential.
Also replaced the HV lead, the old one was pretty crusty and the rubber parts were cracked. I had a spare more modern one I scavenged from an old monitor some years ago. Glad I never threw it out.
The jitter seems to get worse/better as I adjust the contrast control. Control is good though, I verified that it changes smoothly on a meter as I operate it.
Width coil is not open, but I haven't tried it since fixing the first HV issue.
I've tried looking around the HV area in the dark and nothing obvious is visible, but I'm also not able to see some parts well with the set on its side. I'll try again tomorrow - I feel comfortable wiring in the NOS dual pot for focus and brightness now that I know the replacement focus control isn't going to instantly burn up. That will let me flip the set rightside up again and take a better look around. There's still some electrical tape handiwork around the flyback that I haven't replaced yet, also worth investigating.
Maybe relevant but I also hear three or four "thup" noises as the HV comes up. Identical to what I heard when I was messing with the hold adjustments. I wonder if it's just the vertical hold trying to lock in.
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