I'm sorry I've been away from my SE for a while and not been able to work on it anymore. If you look very closely at the picture (which I admit is NOT a very good picture), you can see a slightly dark area cast off to the right of the window that extends all the way to the right side of the screen. This is what I'm referring to.

It's not horrible, so I might shy away from cooking the CRT, but I will try the things suggested earlier in a week or two and let you know how it goes. Too bad I don't have another SE that I could exchange parts from - then I could more easily narrow it down between the CRT and the analog board.