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The picture looks like a straight gun tube. If so, as Eric says, it should have no ion trap. That may be a source of the problem and cause the focus coil to be shifted to re-center the picture.
Make sure the yoke is pushed forward so it is up against the tube. Remove the ion trap and see what the picture looks like.
If it does not focus, note which end of the control gets closest, min or max.
Don
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