Yeah you can actually go right INTO radio shack, with the turbo unit in hand, and they, at least around here.... have all the adaptaplugs hanging off of a display that you can test out with your unit.
then you just get the AC adapter with the right voltage readout, and make sure you stick the tip on the right way for the polarity of the system.
I did this for a duo-r, but the tip is different. I forget what one I needed.