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Originally Posted by John Folsom
The idstributed capacitance of the flyback winding itself along with the distributed capacitance of the yoke, and assiciated circuitry and wiring resonates with the inuctance of the flyback windings and yoke to form the resonant circuit and determin its natural frequency.
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Back about 25 years ago I worked at a small company that made boxes that would photograph video from CAT scanners. Was litle more than a CRT monitor with a camera aimed at it. The cat scanner people would have desired information close to the image edges, so overscan was not allowed. To cut the overscan we had to keep the retrace time to a minimum. One trick was to remove the high voltage winding off the flyback. HV was provided from another source. This would cut the retrace time by about half. Don't know what this did to the horizontal output transistor's collector, but we never blew one up.