>
>Is it possible that the core is vibrating at 580khz
>and shaking itself apart (magnetorestrctive effect)?
>e.g. change in dimension caused by change in magnetic flux).

I haven't checked the specs, but intuitively that seems pretty small for a 
1kW transformer at that frequency.

I've built SMPS's that run around that speed. :)
Just not at that power level.


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