Zvex pedals never used AC power - they've always been DC. The hand-painted ones used to be battery only (you could buy a special back plate, which had a DC connector), while the Vexter series had DC jacks. Now, the hand-painted ones also have DC jacks, but I think that change was made later than 2004. As Marshal28 said, a quick e-mail to the Zvex crew should sort it out. Or you could ask the seller, of course.