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I'll go with Jordan's idea, but if correct, the Horizontal Drive control should make changes you can see in those bars (make them worse and better.) That could then be one of the small disc caps in the rear of the yoke (if that set has them), or other horizontal sweep issues. But it isn't a bad yoke, if I had my guess at it.
If it's not changed in appearance by moving the drive control, then I'd go with a leaky cap someplace, particularly in the video circuit. If that's it, you should see the bars as a foreign waveform if you scope the B+ to the video circuits.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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