Designed by Andy Marshall and licensed by THD Electronics, Jet City's PicoValve amp head is a compact, low-wattage tone machine. The amp head features THD's unique topology, which allows the user to swap the power tube at will”use nearly any octal-based tube without the need to re-bias the amp. With 5 watts, and a 1/2-power mode, you can get full power-amp distortion at volume levels which won't upset the neighbors. The tube guitar amp features a full-tone stack with treble, middle, and bass controls. Preamp and Master Volume controls dial up just the right amount of overdrive and output level. Housed in THD's signature steel cage design, this Jet City amp head is sturdy enough to stand up to the elements, and packs all the tube distortion you're looking for.