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I clipped the lead between C42 and C40 and injected the 1077B's vertical grid drive signal to C42. With the 1077B Amplitude control set about midway, the height is the same as always. Cranking up Amplitude farther distorts the picture but doesn't noticeably increase the height.
Maybe it's time to order a new vertical out transformer and see if that changes anything.
Regards,
Phil Nelson
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