It's not supposed to be an AC charger... it's an AC powered charger that gives DC out!!!. And has previously been said, the PSP chargers with a barrel connector (round also known as Phillips) giving 5V work perfectly...
Originally Posted by ammy
The Sony Reader PRS 600 does not have a round socket for AC. It is only for DC. I am also trying to find the proper charger to use with my USB. I purchased a charger for the newer version of Sony Ereader at future Shop but it doesn't work with my reader.