I have had my Musical Design SP 2B preamp fully modded by Bob and Gary (Bobs "Dynamic Linearity" and power supply mods, Black Gate and V-Caps, and gold over silver wire upgrades to critical areas)with Stunning results. I have had a lot of exotic pre-s in and out of my system but this is the best sound by far. Bob is currently adding a Placette RVC volume control (with the Vishay S 102 resistors) to it which should raise it another level. Bob is also working his magic on my CJ Premier 8As'. There have been other threads before attesting to what Bob and Gary can do to transform your current favorite equipment, and every word true and highly deserved, from my personal experience.