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503: Difference between revisions
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transformer only generates the CRT operating voltages, in the 503 it generates all the | transformer only generates the CRT operating voltages, in the 503 it generates all the | ||
operating voltages other than the two filament circuits which are supplied by the AC mains | operating voltages other than the two filament circuits which are supplied by the AC mains | ||
power transformer. It is basically a tube switch-mode power supply (SMPS). | power transformer. It is basically a tube-based (secondary) switch-mode power supply (SMPS). | ||
A [[6DQ6]] power pentode, V620, feeds switched primary current to transformer T620. | A [[6DQ6]] power pentode, V620, feeds switched primary current to transformer T620. | ||
The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate | The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate | ||