[Adam]

Thanks. Unfortunately it only worked that good for about a day and a half.
Now what it's doing is, when I first turn it on, it pops out of focus about every 2 seconds (out of focus so slightly that I can't really notice it unless there's writing on the screen). When it pops back into focus I see very briefly a single white horizontal line flash across the screen (not always in the same place). After the set warms up for about 10 minutes, it stops going in and out of focus, but the white horiz lines start flashing across the screen at a much faster rate, until it appears that there are several of them at once. (The lines aren't that bright, not really brighter than the rest of the picture, and they don't stay on the screen for long) After the set warms up for 30 minutes or so, the problem becomes intermittent and it will do it for several minutes, then quit for a few minutes, then start up again. Now I won't have time to work on this again till the middle of next week, but anyone have any thoughts on this?
My first thought is to start checking out what's going on around the horiz output tube, but then I've never seen anything like this before. There is no problem with horiz hold, width, linearity, etc. The vertical appears a little jittery in the first couple of minutes the set is on, then stops. But the vert sync is never weak, even when it first comes on. Vert size is fine, vert linearity is not totally perfect, but it's really close. The color is good, the problem occurs exactly in the same way on a color and a b/w picture. It does not effect the sound.