Voltage conversion for Perreaux 350P?

Can't you use a step-down transformer?

Well, actually it should be a step-UP transformer, but these are generally inefficient and ruin the sound. The Perreaux people in NZ say, that such a conversion could be done, but only through qualified personel. This often entails the un- and the resoldering of leads on the transformer, but need not necessarily be the case. Perhaps you could unplug the amp, wait a while until the big caps have discharged, open the case and look inside if there is a switch of some sort for this or better still, take the amp to a good tech. At any rate, according to the literature of the manufacturer, this conversion, as you plan it, is possible.
Cheers,
Detlof

If you have 240v and want to use it with a 110v unit, you need to step down the voltage. It also looks like it would improve the isolation from the main and if anything improve the sound. I guess I could be wrong.

Yea, but with him its the other way round....