I will be making a business trip to Britain, and will need to take my PowerBook (a G3/400 Pismo) to make a presentation. I know I need a 3-prong adapter to plug into a British outlet, but do I need to take a voltage converter as well? I seem to recall that the PowerBooks (at least the old ones) can handle the 220/240 volts of European electrical systems and if so, I'd rather leave the converter at home and save the weight.