I just bought one of these yesterday (used of course) and used it in practice with my band tonight. Man this thing has some great tone! From what I hear these units are rare, but mine is missing the nut that screws onto the 1/4" bright jack input. Where do I find this part? Would a place like Radio Shack have them? In addition, I'd like to hear from any other SVT-IIP preamp users and how you dial in your favorite tones.