Hi Gang,
In the past, when converting equipment from 400 Hz power to 60 Hz power,
I've replace the transformer(s), and increased the size of the filter caps.
That was many moons ago.

These days, it seems like it'd be fairly easy to build something like a
switching power
supply but using a fixed frequency at 400 Hz instead. Has anyone done this
yet, and if so, I'd sure be intersted in the details.

Steve