Yo!
yea, it takes 9v.
the wall wart outputs 9.5v (unlike the UA-5 whos AC input is 12v).
the pisser is that it has a .950mAh draw. That said, you'd need at least 5amps to be comfortable on a two set show. Maybe 4 if you like to play that game.
I gave an RS 12v adapter plug that outputs a selectable voltage of either 4, 6, 9 or 12v from any 12v DC source. I hacked this up (it had a lighter jack input) and made a straight power cable out of it and use spades to attach it to a 12v 5amp or 7amp SLA.
sucks to carry lead around, but I have not found a better solution (for free as I had all of those parts laying around). I believe the walmart 9v lithium Ion DVD power pack is 5amps. That would work pretty well, i'm sure. But I was not about to drop $40 for it when I had all the supplies to make my own.
sucks to be cheap.
But, once you get over that then you set. Its a nice sounding piece of gear for short money.