
Anthony Easton
The Simble Predriver by Mad Professor is a versatile effects unit that functions as a preamp, booster, compressor, and upper harmonic enhancer. It offers a wide range of tonal control and is designed to be easily adjustable using only the picking attack and guitar volume knob. The pedal features a Hot/Cool selector switch that provides additional boost control.
Technical Specifications:
- Controls: Hot/Cool selector switch to match instrument pickups and personal
taste
- Electrical Specifications:
- Power: 9V DC (negative terminal at DC-jack tip)
- Power consumption: 2.5 mA pedal ON / 0.1 mA pedal OFF at 9V DC
- Input impedance: > 2 Mohm
- Output impedance: < 50 kohm
- Using DC-power jack removes the battery from the circuit
- Power Requirements: 6F22 9V battery or DC eliminator 2.1 mm plug center
negative and positive sleeve. When the LED dims, it is time to change the
battery.
Additional Information:
- The Simble Predriver's special circuitry uses a low-noise transistor with
high input impedance (over 2 Mohm), allowing it to boost even piezo pickups
without tone loss.
- The output impedance of 50 Kohm enables it to work effectively even in
front of fuzz pedals.
- The pedal has very low power consumption, allowing it to be used with a 9V
battery for several years if the input jack is removed when not in use.
Watch the latest video demos and reviews for the Simble Predriver from YouTube. Stompbx updates this every six months to reflect the most popular reviewers and guitar pedal demos for each pedal.

Below are live Reverb listings for the Mad Professor Simble Predriver from Reverb. Stompbx automatically aggregates current offers to give you a quick look at available models, conditions, and prices. Perfect for comparing options and making an informed purchase.

Brand New
$229

Mint
$199.90

Excellent
$165.16

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Check out the latest news and articles from around the pedal world.

Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton