Electro-Harmonix Classics Tube Zipper Distortion Guitar Effects
A very flexible effects box.
Picture your guitar signal being massaged by a complex set of filters moving through a vacuum tube maze. Energized by 2 - 12AX7EH tubes, the Tube Zipper's patented moving filter tastefully adds controlled analog harmonics to your signal. In typical EH fashion, each control can be set over the edge, generating a host of novel tones.