Mofetta Overdrive/Distortion

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The Mofetta is a smooth yet fiery overdrive / distortion pedal with MOSFET clipping for authentic tones.

The Wampler Mofetta Overdrive/Distortion is my tribute to the MOSFET-driven magic of a 1990s classic — the MT10 MOSTORTION™. A mainstay of countless top session players, the Mofetta honors the soul of that elusive yet classic circuit while revealing its untapped potential..

Think of the Mofetta as a supercharged MOSTORTION™, reborn and amplified. I made sure that it delivered the classic, amp-like overdrive, massive headroom, and versatile 3-band EQ that made the original so famous. But I also wanted more and added a Texture Switch that introduces actual MOSFETs into the pedal's overdrive section for a bolder, more articulate tone. The Mofetta preserves everything you love about the early '90s legend with a powerful new dimension.

The original MT10 MOSTORTION™ was released in 1990 as part of a budget pedal series to meet the demand of a growing market. Despite the pedal's "cheaper" qualities, guitarists began to take note of its amp-like low-gain tones, attributing them—arguably incorrectly—to the onboard MOSFET Op-amps. Though the pedals were discontinued a couple of years later, used ones command insane prices today and are extremely hard to find. The Mofetta is my way of bringing it all back and re-creating those singing tones while diving even further into the amp-like world of MOSFETs.

The following designations are not owned by or associated with Wampler Pedals, Inc. but are instead owned by their respective owners: MT10 Mostortion, Mostortion. 


Paying tribute to a pedal called the MOSTORTION™, it’s easy to assume the Mofetta would be a high-gain beast. But like its predecessor, it’s the circuit’s low-to-mid-gain voice that the original circuit is most known for. From edge-of-breakup to fat, vintage amp-style crunch, the Mofetta blooms with tube-like compression, always retaining its musical warmth. And with its high-headroom output, it easily pushes your amp or modeler into harmonically-rich breakup. 


Part of what makes the Mofetta so versatile is its unique 3-band EQ. While many overdrives before 1990 relied on a simple tone knob, the idea of a dirt pedal like the MOSTORTION™ with bass, middle, and treble controls was darn near revolutionary. It lets you dial in the Mofetta for a full-range drive or achieve transparent grit that complements your clean tone. If you dial up the mids and treble a bit, you can even use it as a focused boost to push your amp’s breakup, or stacking with another gain pedal, tightening its response and enhancing its character. 


One of the original MOSTORTION’s™ little known “secrets” is that it doesn’t actually use MOSFETs for its overdrive. It uses a “MOSFET based op-amp”, but it uses clipping diodes to produce distortion. This left me thinking, “What if I built one that could actually use MOSFETs for the clipping, using multiple gain staging like a tube amp?” That’s what the Mofetta’s Texture feature is all about – it takes the pedal from smooth overdrive to fiery distortion with the flick of a Texture switch. 


MOSFET clipping delivers a bolder, more articulate voice – louder, tighter, and slightly more aggressive than the original’s diode-driven dirt. While still not “Brutal High Gain,” the Texture switch gives you a wider range of overdrive and even distortion that’s even more responsive to your playing dynamics. Is it better than the OG? That’s up to you, but I think it’s what the MOSTORTION™ was always meant to be.


  • Built in the U.S.A.
  • High-grade components selected for superior sound and response
  • Independent three band EQ (Bass, Mids, Treble), Level and Gain controls
  • Texture switch activates cascaded MOSFET gain stages
  • Battery connection and 9V power jack
  • Top-mounted input and output jacks
  • True bypass switching
  • Includes limited 5-year warranty
  • Dimensions: 2.5” x 4.8” x 2.3” (64mm x 125mm x 60mm)
  • Power draw: 10mA, 9V DC Do not exceed 9V DC



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