I have two A500 PSUs here. One is made in China and weighs a ton (and is verrrry yellow), the other is made in Germany and weighs a lot less and isn't so yellow (i.e. I guess its more modern)
Now, the Chinese one is marked 60W output, but the German one does not have the output marked. Is it likely to be a 50W unit?
Sorry for the banal question, but I sure don't fancy poking multimeter probes in there!