I've got a modded Headsave Classic here. It runs off 2 9 volt batteries rather than being plugged into the wall. Its the newest version, and was actually purchased in the very last order that Norm ever sent out. I'd like to trade it for a Gilmore Lite. I'd imagine a bit of money will also have to change hands. I'm up for any offers. This is perfect for someone that wants a really great portable amp.
I believe it has the AD8620/10. At the time I think Norm said that was best for the HD 580s. It has a single eighth of an inch input (mini), and a standard quarter inch output. It cannot be powered by a wall wart, though I would guess someone with some technical know how might be able to figure it out. The casing is black with a red LED. Sorry for the initial lack of info. Happy to answer any more questions.