"Jim Adney" wrote in message
...

I once saw an ad for someone who was promoting the idea of a bifilar
wound variable autotransformer which was meant to "cure" this problem.
Personally, it didn't seem to be much of a solution, and I've never
seen them on the market. It sounds like an idea which was too hastily
presented, and it must have died as soon as someone thought more
seriously about it.

Anyone else remember seeing this?

Nope. Sounds insane. After all, a Variac is really an autotransformer with a
LOT of taps. You don't want to short the taps together now, do you?

N