Voltage conversion from 220V to 110V.

With all the deals you see on Euro and Asian market stuff that operates on 220V its hard not to wonder is there a problem using a North American converter.

Ive got my eye on a set of Asian market mono bolck tube amps. Theyre the 220V version but theyre also about $1500 cheaper than their North American counterparts.

Can I expect any sonic problem stepping the voltage up for their requirements with a high quality converter?

What kind of converter would work best?

Thanks.