On Wednesday, August 10, 2011 10:47:40 PM UTC-4, Jon Anderson wrote:
Ok, have finally found something workable, if not cheap.
There's a company that makes isolated step down transformers using
toroidal transformers. No iron core to get hot!

Isolation is expensive and unnecessary. You can use a simple bucking transformer
(the 240V 60 Hz rating of a US transformer for saturation of the core
corresponds to 200V 50 Hz rating) that lowers 220V to 200V.

Of course, 'toroidal' refers to the shape, it still has an iron core.