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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: Filament hum

Vinnie, I never did finalize a sine wave version, but I'll tackle that eventually. Meanwhile, the square wave doesn't seem to create any audible issues. If you search the forum and read up on the work that's been done in this area, I think you'll have enough to duplicate my efforts. One thing to remember about these supplies is that everything ahead of the 12V output (step down) transformer is attached in one way or another to the AC mains. If you're inclined to do a lot of experimentation, a small isolation transformer would be a great investment.




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