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Now it behaves differently, and I suspect I was incorrect at where the pop was coming from. This time when I turned it on, I made note that each and every tube was glowing. None of them were going nuts, but they were definitely glowing, including the 6DR7. Wiggling the tube made no difference. I heard a little sizzling going on, and I tracked it to the underside of the board under the damper socket (6DA4) either under pin 2 or 3. It was just a small white spark dancing on top of that solder joint. I'll have to pull the board again to get a better look as that area is covered and difficult to see.
This time there was no activity on the CRT until I turned it off, and the line would appear for a second and disolve to a single point, center screen for 10 seconds or so.
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