Experience the Mad Professor Simble Overdrive Mk2, a refined evolution of the acclaimed original Simble pedal. Renowned for its transparent, organic overdrive, this pedal offers a wide dynamic range and retains the true tone of your instrument. Whether used as a clean boost, subtle crunch, or smooth singing overdrive, it delivers versatile sounds with exceptional clarity.

What’s New?

Collaborating with the original designer Lassi Ukkonen, the Mk2 version introduces enhanced openness, increased headroom, and brighter contour tones. These improvements ensure seamless compatibility with any instrument, making it effortless to find your perfect sound.

Main Features

• LEVEL: Controls the output volume
• SENSITIVITY: Adjusts the amount of distortion and compression
• CONTOUR: Shapes the tonal character, set at unity gain at 12 o’clock
• ACCENT: Alters the tonal range of distortion and pick attack; no effect at minimum, increasing brightness when turned clockwise

Technical Specifications

• Current draw: approx. 10 mA at 9 VDC
• Input impedance: 430 kΩ
• Output impedance: 50 kΩ
• Voltage supply: 9–12 V DC
• True bypass switching for signal integrity
• Powered by a 6F22 9 V battery or DC power supply (2.1 mm plug, centre negative, positive sleeve)
• Reverse polarity protected

Frequently Asked Questions ➤ What type of power supply does the Simble Overdrive Mk2 require?
The pedal requires a 9 V DC power supply with a 2.1 mm centre-negative plug or a 9 V battery (6F22). It supports voltages from 9 to 12 V.
➤ Can the Simble Overdrive Mk2 be used as a clean boost?
Yes, the pedal is versatile and can function as a clean boost, subtle crunch, or smooth overdrive, always preserving your instrument’s core tone.
➤ Is the pedal true bypass?
Yes, the Simble Overdrive Mk2 features true bypass switching, ensuring your signal remains pure when the pedal is disengaged.
➤ How do the ACCENT and CONTOUR controls affect the tone?
The CONTOUR knob shapes the output tone with a neutral setting at 12 o’clock. The ACCENT control adjusts the tonal range and pick attack brightness, with no effect when fully counterclockwise and increased brightness clockwise.
➤ How do I know when to replace the battery?
The LED indicator will dim when the battery is running low, signalling it’s time for replacement.

Outside the UK?

Please note that shipping costs outside the UK are very approximate and can vary radically. Please contact us with your Country and Post/Zip Code for an accurate quote. Many thanks. Please also note if you are outside the UK we will not charge you tax on your purchase but you may be liable for import duty in your country.

Please also note that all our stock is sold for the UK market. If you are buying from outside the UK, please check that it is suitable for use in your country before purchase.