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The most common area to have problems on most any old tv will be the verticle circuit. Everything has to function just right to have a full and correct raster. You can be certain you have a bad cap right now. If you just want to play around, and not do the wholesale recap just yet, find the vertical circuit and seek out the caps, then replace them one by one until the problem goes away. The first old set I brought back to life was a '50 Philco and I had little in the way of experience, plus no schematic. So, I turned the chassis over, noted the location of the vert. osc, then followed wired from the vert. hold and lin controls, and looked at what was there. I found a number of caps. With each replacement I saw the picture improve. This is one way to learn as you do it.
Lots of shops have done the "leave in circuit" shortcut. Maybe some of them don't know better. Best, I think, to install a terminal strip near the base of the can and then just transfer everything over.
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Bryan
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