Discussion about the Korg PolySix synthesizer

Hello,

the first thing you should look at is the internal transformer and the
small PCB next to it.

If the service manual is to be believed there are different combinations.
It might well be that the internal transformer can be rewired for 120V.
This should probably handle 127V ok.

As far as the rating of the stepdown transformer goes: The 235V have
nothing to do with this. According to the manual the Polysix consumes 25W
of power. So the stepdown converter needs to handle this plus some margin.
The good news is that the power rating is uncritical once you are above the
requirements of the device: A transformer capable of delivering 100VA,
200VA or 500VA would be equally working (but would get significantly
bulkier).

I'm not 100% sure if you want to use a stepdown transformer or if you want
to exchange the internal transformer for a new one.