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Sounds like you have a "PC" chassis set. The most common problems were the 100uf cap in the vertical circuit failing. Early productions used a 50V capacitor, later productions used a 63V capacitor; but, both types are high failure. When I fixed these sets, I always used a 100V high temperature capacitor and I never had any callbacks. The other common problem is the big 100uf, 160V capacitor that's located at the rear right corner of the chassis, close to the flyback. If this capacitor opens and if the set is left on too long, the horizontal centering control will burn up and the HOT will short. Sometimes, when the centering control burns, you can isolate it's case from the heatsink that it's mounted to and it will work OK. I have also replaced the control with, IIRC, two 250 ohm, 5 watt resistors.
I can't remember the value; but, there is another capacitor in the B+ line to the video output stage that will open and cause one side of the screen to be darker than the other, along with a smeary, streaky picture.
There was one other capacitor in the vertical circuit that gave trouble; but, I can't remember the value. I want to say 10uf and it was close to the yoke plug.
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