Well, I tried cleaning the dust out of my Dell-branded Trinitron tube. In so doing I seem to have knocked the convergence out of whack, even though I was really careful vacuuming around the CRT.
There's an on-screen convergence control, but even with it cranked all the way over (to 100/100 for the horizontal control, 76 for the vertical), there are still highly visible "ghosts" on screen.
Are there any other convergence controls I could adjust to get it closer, like pots on one of the boards? Or how about trying to tweak the deflection coils a tiny bit?
This monitor is on its last legs, so I'm not going to be investing a lot (in terms of time, and $0 in money) in it. I'd just like to know if I can get a few more weeks or months of use out of it.
Pity, really: when it worked well, this was an outstanding monitor.