Hi "rrr", Although the frequency is pretty high it would be well suited to a nice high Q spacewound coil with a reasonably large topload. Output voltage would depend on secondary Q and breakout voltage of the topload. Malcolm > Original Poster: "rrrr" <rrrr-at-lisco-dot-net> > > I have a very old 10 kw induction heater > runs at 1mhz > has any one ever used any thing like this for a primary circuit ????? > > >