I know I'm resurrecting an old post but I just got 788 that a guy purchased in 03. The PO said he lost the power supply in storage and I'm pretty good with engineering electronic circuits. Could you elaborate on what you used and your schematic in building your power supply. I can't feasibly seem to find one anywhere out here for sale in cyberland. That's puzzling as I read a lot of good things about the 788. Even TASCAM is extremely cryptic about a power supply for this unit.
"Sometimes Love Has No Rhyme; Has No Reason-even when you try to be cool....." George Duke