The SFX-03 Twin Tube Classic preamp pedal delivers all the gain and smooth tone you'd expect from a high-quality tube preamp. The high-plate voltage and 100% vacuum tube signal path allow the 2 - 6021 dual-triode tubes to operate at their fullest potential and provide maximum dynamic range. Two channels expand the tonal possibilities of this preamp even more, from glassy, smooth clean tones to warm crunch with tons of bite. Power supply included.