I'd try them, but cautiously. Running a 60Hz transformer at 500Hz will mean
that you have a higher unloaded inductance (good), a higher leakage
inductance (bad), lower peak flux in the core (good), higher eddy current
losses (bad), etc., etc. The eddy current losses are what will get you in
theory, but in practice the smaller power transformers have laminations that
seem to be thinner than necessary as a matter of constructional convenience.

Hook it up, try it out, look for sparks, smell for smoke, and after a while
put one of your less-valuable fingers on the core and see if it's getting
hot.

Back in the days of tubes it was common to see a moderate-power line
transformer used as an output or a modulation transformer. If that's what
you're thinking then search around on the web -- I recall a pretty
comprehensive article about converting a power transformer to an output or
modulation transformer (I can't remember which). I'm too young to have
actually done this, but if this is what you're trying maybe you can find the
article.

"larry" wrote in message
.cable.rogers.com...
Way back, when I was 7 or 8 years old, (I am 55 now), my dad got me an
electric train set....During that Christmas we were at my Grandparents
place
and they were on 25 hz power....At home we were on 60 hz power...

We had to be at home for me to try out my new train set.

What has that got to do with this question?...

This....

I have a number of transformers and would like to experiement using then
at
a higher frequency....let say 500 hz and / or higher.....

Would they still work?...I am assuming so...

Would they run cooler?....

Could anyone foresee any negative effects?....

Larry ve3fxq