by sefton » Sat Aug 29, 2009 3:07 pm
Uh...no you don't. I have been going back and forth between the US and Japan for almost 20 years, and never used a converter.
There is a very slight difference (the US has more voltage), but that would only affect very sensitive electrical devices. I have used desktop computers, guitar amps, cd players, lamps, and just about everything else in both countries without a hitch.