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I have tried looking at this some more: disconnected the video output tube with no difference in symptoms. I pulled off the CRT socket and turned on the set...there was no arcing. Then I tried disconnecting the screen leads and this decreases the severity of the arcing, although there is still somewhat of glow among the tube elements.
Somehow the HV is finding a discharge path back through the base elements of the tube as there is no arcing/glow when the CRT socket is disconnected. I'll just need to try the chassis out on another CRT for a conclusive test. I don't have an HV probe so cannot directly measure focus voltage.
This is part of a group of sets I got that had been stored in a repair shop for more than 25 years after the repairs were declined for whatever reason...I am seeing some more difficult problems in these than the sets I usually get from estate sales, etc. that just have normal age-related problems.
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