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Here is my latest further simplified itteration. I will grab the B+ boost from the flyback transformer. The FET will be picking off about 3mA which should be relatively inconsequential. The 650VDC available as a supply to the FET drain should allow a nearly 600v p-p swing which should be adequate to provide the vertical convergence.
See the attached drawings for the modified circuit and the B+ boost source.
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