For sale is a Nelson Pass design preamp that I purchased from the original builder. As you can see from pics it is a beautiful looking unit, housed in an chassis from a Century A-21 amp. Not only does that chassis look nice, it was also chosen because the BOZ takes advantage of the remote controlled ALPS volume control that amp originally used. Beautiful remote can control volume and select inputs, but some of the lettering is rubbed off a bit. The other great features of this amp are the adjustable gain and remote speeds (how much the attenuator moves with each press of the remote button) on the back of the preamp. This really lets you dial this preamp in for the amount of gain and fine-grained volume control that you want.
Best place to look for info on the BOZ (Bride of Zen) is diyaudio.com and see the manual with discussion of this design here:
http://www.passdiy.com/pdf/brideofzen.pdfYou aren't likely going to be able to find a Nelson Pass designed remote controlled active preamp for close to this price.
$OLD plus shipping.
