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Side to side motion should not be related to the vertical.
If the width undulates in and out over the screen (giving an hourglass like effect to the image) and the undulation slowly rolls vertically then it's an issue with the filtering of the B+ or maybe a heater cathode short in a tube, or bad ground.
If the width is not being modulated and the whole image is shifting horizontally then it's a problem with the horizontal sync or oscillator circuits. Sweep stage mica capacitors could contribute to this issue.
The full Sam's should have a parts list and list generic subs if any were known at the time of publishing. I'd look it up but my Sam's are sparse below 100.
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