Much sought after electronic preamp booster and tone shaper in very good condition as used by used by Meshuggah and other metal bands. Tested and fully working. Serial number 567855. Bought early 1990's, barely used at home, never gigged. The paint is a little scratched in places, but otherwise in excellent condition. Can be run from an internal 9V battery but apparently best used with external power supply at 18v or 32v.