The Tone City Mad Stone is a classic germanium diode fuzz pedal with an Octave-Up function, high quality DIP component, and true bypass circuitry.
Please note: The Mad Stone will not work with a 9V battery and requires a 9V DC power supply (not included) to operate. Tone City Pedals work best with a regulated power supply. You may experience unwanted noise with a non-regulated power supply. Try a Truetone 1Spot or a Planet Waves power supply.