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Based on my experience working at Zenith your problem is definitely the deflection yoke. Zenith had lots of trouble with a yoke vendor and thousands of yokes were being returned each week. The problem was eventually solved by going in at the vendor and showing him how to properly wind a yoke. The two main defect simptoms were the diagonal pattern and a keystone pattern.
Later on when color was blooming we (Zenith) went into our own manufacturing of yokes.
konrad
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