You may have problems with the radio, regardless of power. Radio channels in the US use a different standard to Europe (and Australia follows the European standard). If the tuning is all analogue, it should still work, but if there's any digital channel tuning, the channel widths/bands won't be aligned.
http://www.epanorama.net/documents/r...fferences.html
You may be lucky and it may be switchable between the two schemes.