Quote:
Originally Posted by Electronic M
If you are trying to design a tube sweep circuit to drive a solid state era yoke you may want to look into matching transformers....In the 1970s there were test jigs built with a deltagun CRT and tube deflection style yoke that came with matching transformers that allowed them to work with solid state chassis...If you can use a matching transformer to drive a tube yoke with a solid state chassis then you should be able to use a matching transformer to do the opposite.
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I was thinking that an impedance matching transformer would be needed for both horizontal and vertical deflection output stages. Similar to how tube audio amps typically have an output transformer to step the output voltage down and the output current up. Grob describes a tube amp output stage for vertical deflection and the need for a transformer to couple the beam power pentode plate to the vertical deflection coil. But unlike his chapter on video amplifier design, which is a step by step cookbook, Grob doesn’t specify step by step formulas for determining the impedance matching transformer parameters and beam power amplifier parameters for a given yoke inductance.
Not knocking Grob, by the way. His book is incredible and provides cookbook level step by step details for literally every other aspect of a TV chassis. I think deflection tech is the one thing that changed the most throughout the era of CRT displays. So unlike his other chapters, he kept the explanation at a high level so that it wouldn’t become quickly outdated. Searching scholar.google.com, it appears as though active research was going on in computer driven yoke design up until the early 2000s.