>> 50 Hz or 60 Hz operation should not really make any difference.
>
>With magnetics like a transformer it DOES make a difference. For some
>equipment it can make so much of a difference that the magic smoke
>appears. The op's situation however shouldn't be one of those cases.

I agree. My father used to have to deal with projectors bought in the USA, 
that had cooling fans which were not 50/60Hz. These were generally shaded 
pole motors. A typical cure was to remove the winding and fill the bobbin 
with as many turns of wire 1 or possibly 2 gauges thinner. This gave enough 
extra inductance for 50Hz operation.

As for Brent's problem - are you running a full bridge rectifier? If so the 
peak current of the rectifier waveform may be the problem. Put a half ohm or 
1 ohm resistor in series with the transformer to limit the peak current. 

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