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Agree with the comments above. For example, I restored an RCA 630TS recently and the horizontal looked the same. There was evidence of work around the horizontal frequency transformer, called "Horizontal Frequency" on the rear apron. "Could it be that simple?" It was. apparently in the past, the transformer had been cranked way far away to compensate for a failing component (no doubt, a capacitor). Turning it slowly, the lines became less and less and voila, a stable picture. The procedure was to center the Horizontal Hold Control and then adjust the Horizontal Frequency for a stable picture.
So, I bet that is all that you need to do. Please, let us know!
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