Oooh, I like the idea of using a variac like that! And with TEC, you could probably get away with just rectifying and filtering, no regulation.
By the by, Since, how big is that variac? I've an old 10 A one, but it's too bulky for casual use. One last bit of hijacking - don't suppose you have any info on brush replacing/rebuilding? Mine's getting mighty worn.
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