An interesting 50/60 Hz transformer that carries a kw or two and has a big
air gap is the Austin Ring Transformer
(http://www.austin-insulators.com/radio/xfmr.html). It's commonly used to
get AC power onto an RF hot tower to drive the lights on a series fed AM
tower. I've always been amazed how they work. You could run a lot of
toothbrushes with one of these!

Harold



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