Mad Professor Stone Grey Distortion


Stone Grey Distortion Modernized mod – Transforms your clean amp into an authoritative hard rock guitar tone! Custom pedals series – During the Covid-19 our factory hasn’t been running at full power. So we, here at the Mad Professor headquarters, have had some extra time to bring out some mods that were requested over the years to our pedals. Normally we´d have no time to do anything like this!

In stock

Mad Professor Stone Grey Distortion
Mad Professor Stone Grey Distortion 239,00 

The Mad Professor Stone Grey Distortion is a legendary pedal that delivers a raw, unadulterated distortion experience. Crafted with precision and a passion for vintage tones, this pedal takes your guitar sound to a new level.

Step into a sonic realm where gritty, edgy tones reign supreme. The Stone Grey Distortion unleashes a powerful wall of sound, perfect for cutting through the mix or adding a layer of grit to your solos. Its responsive controls allow you to tailor your distortion texture to perfection.

Designed for the discerning guitarist, this pedal is built to withstand the rigors of the road. With its rugged construction, you can count on the Mad Professor Stone Grey Distortion to be your reliable companion on stage and in the studio. Elevate your guitar game and explore a world of gritty, vintage-inspired tones with this iconic pedal.


VOLUME: Sets the output level of the distorted signal.

TONE:: This is a boost/cut “shelving” type equalizer that controls the amount of high-end, operating somewhere between a bright switch and the treble control on most amplifiers.

DISTORTION: Sets the level of distortion. – lower levels more overdrive-like textures – higher with heavier distortion.

CAUTION: Never operate the unit with its bottom removed or damage will most likely occur.


Current consumption: 8mA at 9VDC

Voltage supply range: 7,5-15 V

Input impedance: approximately 500K

Recommended Output Load: 50K or higher

Complete bypass (true bypass) and input of circuit grounded when in bypass.

POWER REQUIREMENTS: 6F22 9V battery or DC eliminator 2.1 mm plug center/negative and positive/sleeve.

Additional information

Weight0,5 kg
Dimensions15 × 9 × 8 cm

Mad Professor

Effects Type