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Weak vertical oscillator and vertical output tubes, and failure of many of the parts around these two tubes could cause the display to look like this. A few month ago, I had a similar problem on my '51 set, I tested the vertical tubes, and they seemed to be ok, so I replaced all the caps in the vertical circuit, checked resistors and replaced a few that were out of spec... nothing changed.... finally bought a couple of NOS (new old stock) tubes on eBay (these were odd tubes, 6s4 and 7n7 that I did not have in my stock) and they fixed he problem.
Do you have any sound? or "Hum" in the audio?
jr
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