I have seem some TEK CRTs that used small magnets taped to the CRT used to fine tune the CRT. I bought a 475 that had these magnets on the CRT and they were obviously original to the CRT. The tape that secured them had become brittle over the years so I had to add some new tape to keep the magnets in their original position. Could it be possible that the problem is related to such magnets? Perhaps they are present and have shifted out of place? Or perhaps they might have attracted a piece of foreign mater that is distorting the beam?
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Michael Lynch
Dardanelle, AR
Michael W. Lynch