Well, it's arcing all around the diameter of the tube where the metal frame surrounding the tube is. It arcs in that 1/4" gap. It sizzles after the set has been on about 5-10 seconds. As the HV comes up and the CRT comes on it intensifies. The dag coating sounds like the issue. I'll try that when I get the chance to work on it.
As far as everything else goes, what you listed is where I'm headed to. I've already tested tubes. A couple are marginal. I need to go through my stash and find replacements. I plan to give it the thorough going over when I get the free time to do so. As far as soldering joints, a long departed repairman I knew many years ago told me "95% of the repairs I've made in my life were just busted solder joints." I've found that and, with the passage of time, capacitors to be the majority case as well.
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