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 239,00 

You could say our versatile high-gain distortion pedal Stone Grey Distortion has the attitude, well it just got even more aggressive! If you are looking for a modern distortion with a tight bottom end that never gets mushy even in killing speed, look no further! Modernized mod is a shot of adrenaline that brings the Stone Grey Distortion Custom Series pedal from Sabbath-tones into todays tonality as the midrange has been notched a bit and more gain has been added. Think sonic characteristics and touch sensitivity of a tight high quality 100 watt tube amplifier.

Stone Grey Distortion Custom is the ideal choice for players seeking hi-gain, rock, metal and drop tuning style tones. However, an open minded hard rocker will also happily notice that this limited edition pedal works wonderfully as a low gain pedal with great dynamics, as does the original version. These limited edition hand modded here in Finland custom series pedals are available until further notice. Grab your limited edition pedal while they are here!


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


Mad Professor

Effects Type


Availability Now available in-store at
15 Kilkis Street Latsia Nicosia 2234

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