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I am currently searching for a MOSFET with Vds of minimum 1000v. In these days of switchmode power supplies, devices of 1000 volts plus abound.
The convergence waveform amplitude of max 350 p-p was so close I believe the additional B+ boost should be just enough to achieve good vertical convergence.
The circuit replacement will be more reliable and not subject to the fragile transformer leakage and failure.
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