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ideas on variable filament supplies?

I know I can vary the voltage by using a variable transformer, but is there any less expensive way to make adjustable filament voltage supplies? I need to build a couple for some 1.5 volt amd 2.5 volt dht tubes.



Edits: 07/22/15

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Topic - ideas on variable filament supplies? - vinnie2 13:15:06 07/21/15 (18)

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