[TCML] 400 hz variacs

[Jim Lux]

On Dec 11, 2010, at 10:37 PM, HomerLea at aol.com wrote:

> These seem just as heavy as 120v 1.3 amp 60hz ones. What I don't get is how 
> some fixed transformers are rated, for example, at 47hz to 400 hz; not 
> uncommon for military transformers. Guess I should have been an electrical 
> engineer instead of chemist.
> Jim
> 

They build them for the whole range.   Cross-sectional area for the low frequency.  Thin laminations and low hysteresis for the high.