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Okay so by turning the B+ VR all the way down it is affecting other things, like the vertical (hence the retrace) which is why radiotvnut noted that its the wrong adjustment for an excessively wide horizontal. Meaning it will not correct a positioning problem either.
My guess is that there could be dry caps and drifted resistors in the horizontal circuit probably near the HOT heatsink. But setting the b+ as directed will make it a lot easier to troubleshoot for sure.
Hey isn't this set a 13 incher?
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