Hmm, I'm talking mid-80s flashes here. And the socket is labeled 'AC' with two pins inside the somewhat rectangular hole. Of course no flash could take the 240 I got humming in my wall socket.
So, the consesus is that this is for sync and not power?
I have also seen the hammerhead flashes that has sockets for battery eliminators, and I thought that these could be the same on my lame auto flashes. And it would kind of make sense since there's a tab connected to the battery on/off-switch which partially blocks the socket when set on 'on', and I thought it could be to prevent using to power sources. Well then, my plans for powering my armada of lame-o flashes indoors seems here by be put on ice.