I am getting shipped to Beijing pretty soon, and my amps will be shipped over there too (a little bit later). One of my amps is already dual voltage, I just have to flip a switch and plug it into a wall. Some of my other ones will need some help though. I'm sure I can find a 200 watt converter in China without much of a problem (they're about $35 here), but I was wondering if there are any purpose-built solutions out there that people use? What's the deal with buffered supplies? One of the amps going over is a Dr Z. I don't want to screw that up, especially as the nearest authorized dealer is in Hong Kong. I've asked this same question of their customer service and I'm waiting for a response. I suppose I could swap input transformers on some, but I don't know enough about what makes a good transformer to go ahead and do that. Bonus, most wall warts are already dual voltage so at worst you need a plug adapter when you travel. That was useful news to me!