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

Mofetta Overdrive / Distortion

Batch one of the Mofetta is sold out. Orders placed will be shipped within 90 days

The Wampler Mofetta Overdrive/Distortion is my tribute to the MOSFET-driven magic of a 1990s classic — the MT10 MOSTORTIONtm. 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 MOSTORTIONtm, 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 MOSTORTIONtm 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



Available on backorder

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Cancer and Reproductive Harm


Paying tribute to a pedal called the MOSTORTIONtm, 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 MOSTORTIONtm 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’stm 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 MOSTORTIONtm was always meant to be.  

See it in action:

Technical Details
  • 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
Customer Support
CUSTOMER SATISFACTION GUARANTEE. Wampler offers a 30 day no questions asked return policy on any pedal purchased through the website. In order to satisfy the requirements for the return the pedal must have the battery inside, complete with all original packaging and all in as new condition. Please contact us via [email protected] to arrange (please include your order number) the return. Please note, any pedal bought through a dealer is not applicable – please refer to their specific returns policy.

WAMPLER Pedals Limited Warranty. WAMPLER offers a five (5) year warranty to the original purchaser that this WAMPLER product will be free from defects in material and workmanship. A dated sales receipt will establish coverage under this warranty. This warranty does not cover service or parts to repair damage caused by accident, neglect, normal cosmetic wear, disaster, misuse, abuse, negligence, inadequate packing or shipping procedures and service, repair or modifications to the product, which have not been authorized by WAMPLER. If this product is defective in materials or workmanship as warranted above, your sole remedy shall be repair replacement as provided below.

RETURN PROCEDURES. In the unlikely event that a defect should occur, follow the procedure outlined below. Defective products must be shipped, together with a dated sales receipt, freight pre-paid and insured directly to WAMPLER SERVICE DEPT – 5300 Harbor Street, Commerce, CA 90040, USA. A Return Authorization Number must be obtained from our Customer Service Department prior to shipping the product. Products must be shipped in their original packaging or its equivalent; in any case, the risk of loss or damage in transit is to be borne by the purchaser. The Returns Authorization Number must appear in large print directly below the shipping address. Always include a brief description of the defect, along with your correct return address and telephone number.

When emailing to inquire about a returned product, always refer to the Return Authorization Number. If WAMPLER determines that the unit was defective in materials or workmanship at any time during the warranty period, WAMPLER has the option or repairing or replacing the product at no additional charge, except as set forth below. All replaced parts become a property of WAMPLER. Products replaced or repaired under this warranty will be returned via ground shipping within the United States freight prepaid. WAMPLER is not responsible for costs associated with expedited shipping, either to WAMPLER or the return of the product to the customer.

INCIDENTAL OR CONSEQUENTIAL DAMAGE. In no event is WAMPLER liable for any incident or consequential damages arising out of the use or inability of the possibility of such damages, or any other claim by any other party. Some states do not allow the seclusion or limitation of consequential damages, so the above limitation and exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which may vary from state to state.

FOR YOUR PROTECTION. Please complete the online warranty registration within (10) ten days of the date of purchase so that we may contact you directly in the event of a safety notification issued in accordance with the 1972 Consumer Product Safety Act.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantees that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures.

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and the receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experience radio/TV technician for help.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s warranty to operate the equipment.

CUSTOMER SUPPORT. Our dedicated staff is ready to help you with any warranty or product questions – please email us at [email protected] or call us on (765) 352-8626.

Please remember to register your pedal as soon as possible after purchase at the following web page to ensure quicker service if you should ever need to make a warranty claim: warranty registration


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