What is the biggest device that can be plugged into a shaver socket (in terms of amperage, wattage, etc.) without blowing up the isolation transformer?

I'm assuming a small mains-operated solid-state table radio will be fine, right? The thirty year old critter I'm listening to here uses about 5 watts at 120 volts AC.

[This message has been edited by SvenNYC (edited 10-30-2003).]