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Dumb question time: when/why is "teflon-coated silver-plated wire" used for toroid winding? I never see it used for QRP stuff, but have seen it in higher-power designs. My best guess is that there is less knicking of insulation as the wire is pulled through a sharp-edged toroid. But I also wondered if ease of winding or thermal properties had anything to do with it. When would you use teflon over regular magnet wire?