If it just needs a 12V adapter, then provided you can find one with a suitable plug on the (12V) end then any generic adapter should work, and it shouldn't be hard to find a 110/220V one. You can get adjustable (output) voltage ones which come with a range of plugs on the low voltage end. Just make sure the output Amps rating is at least as great as the original Sony adapter, and go for a reputable source - some cheap Far Easter imports are of very poor quality, some even being positively dangerous.