Decided to have a go at my 9T246 that's been "on display" since I picked it up over the summer. Powered it up on a variac when I got it, and while the raster was bright, the picture was a distorted mess. Today, as the wife was baking cookies, I went as far as the capacitors I had on the shelf would take me, and this is what I got!
Clicking the picture will take you to the video 
Weird problem though. If I leave it on the channel that was on when I turned it on, the set is fine. As soon as I change the channel, the picture loses horizontal sync. Otherwise, I just watched a full episode of Gunsmoke on the thing.....
If I turn the set off for a half hour or so, then turn it on, the channel I left it on is fine.
Ideas/thoughts? Obviously I'm going to have to order the rest of the capacitors and finish the re-cap, but this is something I haven't seen before.