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Sounds like you have two seperate problems. I would check all of the components in the vertical output and oscillator sections. The problem with the picture is probably a bad component in the video circuitry based on the fact that you did not mention the sound being effected. As always first check your tubes. Start with the easiest and most likely points of failure, which will be the tubes.
Typically a very old TV will have more than bad tubes to be dealt with but not always. If you like the set and want to use it for more than a few minutes you need to consider replacing the capacitors and check resistor values for being out of spec by more than 20%. You need to have a schematic but it is not completely necessary. Just learn your resistor color code. Replace capacitors with equal or more working voltage and capacity. Pay close attention to polarity with electrolytic capacitors. I don't know what your experience is with electronic repair so I wont go into this too far but these are some basic rules of thumb. Then of course there is safety. You can get jolted pretty good with an unplugged set if you are not carefull. Discharge all capacitors that you come in contact with. Last the CRT is basically a very large capacitor with stored 2nd anode voltage. You DO NOT want to feel the result of becoming part of that circuit!!
Be careful, have fun, and I'm sure if you have any specific questions with your repair some of the folks with way more knowledge than I will be glad to assist, as will I if I know the answer....
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