On Sun, 3 Jul 2011 14:54:05 +0000 (UTC), "Geoffrey S. Mendelson"
wrote:

However, quite often things sold in the US were not spec'ed properly, they
were designed to work at 60Hz, without a big change in frequency or current
draw.

I had a wonderful Phase Linear 400 watt per channel amp I had to sell when I
left the US because their transformers were well known not to be able to
stand 50Hz. :-(

It's fairly easy to build a 50Hz to 60Hz switching inverter. Start
with a 230V 50Hz power supply that produces 330VDC. Then run the
330VDC through a 60Hz chopper to get a 330VDC peak-to-peak square
wave. If your xformer is fails to appreciate square waves and
converts the harmonic energy into heat, then something more
sophisticated, like a step approximated sine wave switcher can replace
the chopper.

Well, maybe this is overkill (and inefficient):
http://www.hzfrequencyconverter.com

Also, I just downloaded the Phase Linear 400 schematic:
http://www.schematicsunlimited.com/download.php?manu=phase-linear&file=phase-linear-400-power-amplifier-schematic.pdf
and found that the xformer is just a full wave center tapped single
winding (other than the winding running the pilot lights). You could
possibly have found a 50Hz replacement for something that simple or
deviced another +75v/-75v power source. Oh well, too late.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558