Ron, Switching PS for Filaments?

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I posed this question on the tube forum also. What do you think about using switching power supplies for filaments. Most 5v units can be cheated up to over 6v and the switching frequency is at least 50khz, well out of the audio band. 3.3v units can be cheated down to 2.5v for SE tubes. The output design of these supplies is basically a choke input filter network as the regulation is done on the primary side. They are cheap surplus, small, and will not produce a strong 60hz field like high current linear supplies do.

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Topic - Ron, Switching PS for Filaments? - Glimmie 12:37:46 01/16/01 (1)

Re: Ron, Switching PS for Filaments? - Ron W. 11:20:28 01/23/01 (0)

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