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The convergence pin showed a lot of white corrosion, which looked like evidence of poor contact in the past. So I shined that one up. I also tightened all the socket pins, since I have intermittent contact on the filament. Much better, but still fails to have proper contact on the filament once in a while when I first put the socket back on the CRT after working on the chassis. The focus pin doesn't look bad, but that in itself doesn't really mean anything. The convergence pin seems to be working, since the convergence control has a big effect on convergence, and the convergence is stable once set.
I do wonder a bit whether the focus pin is making poor contact. The way the socket is designed, it's a little tricky to get a wire in there to wrap around the CRT pin as an independent method to see if the voltage is really getting to the pin. Sounds like I should probably put some effort into that. Or, if you have any particular suggestion how to go after that possible problem, let me know.
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