Nick Carbonetta builds/sells the nbox'es. He's here. PM him at "schoepsnbox". PM me if you have trouble reaching him.
Oh, and the Nbox is a preamp + power supply. It uses 4x 9v batteries, provides the 60v for the caps, includes a "kcy"-type cable that Nick builds, the Schoeps Collette connectors, gives you about +18db gain (fixed), and unbalanced rca outs.