I bought a multitrack recorder from the US (I live in Europe). If you can find an adaptor that matches the specs of your equipment you might not need a voltage converter, just replace the "old" adaptor for a new one.
Like, instead of a 12v/120v I used a 12v/220 adaptor, but i contacted fostex first to check. Make sure the - + are on the right side.
If this is cheaper...might be easier to get as well...