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Timmy, when you adjust the HV down to 25K, you will actually be putting more load on the flyback. Remember, the total load on the flyback is the sum of the current drawn by the CRT and the current drawn my the HV voltage regulator. As the scene on the CRT gets brighter, the CRT draws more current while the voltage regulator draws less and vice versa. The whole idea of shunt regulators is to present a constant current load to the flyback/HV rectifier under all screen brightness levels.
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