If your 2 primary windings have an even slightly different number of
turns then they will load the transformer like a shorted turn does.
I'm not sure how important it is that the leakage inductances etc
match but that may come into the equation also. If they're not bifilar
wound it could be the problem.
RP

On 30/11/06, Bob Blick <bblick@sonic.net> wrote:
>
>
> > I've checked and double checked that my two primary windings are wired in
> > parallel
> > for 115V operation with the correct polarity, the output is also OK and my
> > no load
> > test above even had the secondaries completely disconneted. I will wire
> > one up for
> > 230V operation now and check to see how hot it runs on 50Hz.
>
>
> Have you tried just one primary? Does it still get hot? Then connect one
> lead of the other primary and measure the voltage of the final connection
> of the primary to absolutely double-check the phase.
>
> Cheers,
>
> Bob
>
>
>
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