12AU7 Preamp - Tube PedalThe 12AU7 PREAMP is specifically designed for acoustic guitars, especially those with piezo pickups, with the goal of making the signal sound like an actual guitar. Let the audience hear what you hear! No more phony brightness, but rather a much more natural presentation with enough tone control range to dial in your desired sound. A JFET input stage offers up very high input impedance for improved bottom end when connected to piezo directly. The XLR