Electro Harmonix Nano Big Muff PI 2 Fuzz Pedal

The Electro-Harmonix Big Muff Pi 2 brings a previously unreleased chapter of Big Muff history to life. Built around a long-lost dual-op-amp circuit designed during the 1970s, it delivers the thick sustain and full-bodied saturation associated with the Big Muff family while introducing a rougher, more mid-forward personality of its own.

Compared with many traditional Big Muff variations, the Big Muff Pi 2 offers slightly lower gain, a less polished edge and a pronounced midrange grind. Lower Sustain settings provide heavy crunch with plenty of attack, while higher settings create dense, speaker-pounding fuzz and long, singing sustain.

The familiar Volume, Tone and Sustain controls keep operation immediate, while a soft-touch footswitch offers both conventional latching and momentary operation. Housed in a rugged Nano-sized enclosure and supplied with a 9V battery, the Big Muff Pi 2 combines an intriguing piece of Electro-Harmonix history with modern pedalboard practicality.

Quick Product Summary

The Electro-Harmonix Big Muff Pi 2 is an analogue fuzz, distortion and sustainer pedal featuring a unique circuit built around two dual operational amplifiers.

Originally conceived by Big Muff designer Bob Myer during the late 1970s, the circuit remained unreleased until the original schematic was rediscovered and decoded in collaboration with Josh Scott of JHS Pedals.

Its distinctive sound combines the sustain and weight of a classic Big Muff with a slightly lower-gain response, gritty edges and greater midrange presence. A soft-touch latching and momentary footswitch makes it suitable for conventional always-on fuzz sounds as well as brief bursts of saturation during a performance.

At A Glance

Feature	Details
Brand	Electro-Harmonix
Model	Big Muff Pi 2
Product Type	Fuzz, distortion and sustainer pedal
Circuit	Analogue dual-op-amp design
Operational Amplifiers	Two dual op-amps
Controls	Volume, Tone and Sustain
Switching	Latching and momentary
Bypass	Mechanical-relay true bypass
Audio Format	Mono
Input Impedance	117kΩ
Maximum Output Impedance	2.7kΩ
Power	9V battery or optional 9V DC adapter
Current Draw	15mA
Dimensions	4.5 × 2.75 × 2.1 inches
Enclosure	Compact Nano-sized chassis
Release Year	2025
Main Appeal	Rediscovered dual-op-amp Big Muff circuit with gritty mids and huge sustain
Best For	Alternative rock, grunge, heavy rock, shoegaze, psychedelic and experimental music
Suitable Instruments	Electric guitar, bass and compatible electronic instruments
Condition	Brand New

Why Choose the Electro-Harmonix Big Muff Pi 2?

A Lost Big Muff Circuit Brought to Life

The Big Muff Pi 2 is based on a previously unreleased circuit developed during the 1970s by Bob Myer, one of the original designers behind the Big Muff Pi.

The hand-drawn schematic was uncovered decades later among Myer’s original notes. Josh Scott of JHS Pedals decoded the design, allowing Electro-Harmonix to produce the circuit commercially for the first time.

This gives the Big Muff Pi 2 a genuine place within Big Muff history rather than simply making it another variation of an existing production model.

Unique Dual-Op-Amp Architecture

The pedal uses two dual operational amplifiers to generate its gain, distortion and sustain.

This creates a different feel from the transistor-based architecture found in many classic Big Muff models. The result remains recognisably Big Muff, but with its own combination of:

• Gritty midrange presence

• Slightly lower overall gain

• Rougher distortion edges

• Strong pick attack

• Full-bodied saturation

• Long, compressed sustain

• Heavy crunch at restrained settings

The distinctive op-amp architecture makes the Big Muff Pi 2 an excellent alternative for players who find some traditional Big Muff circuits too smooth or heavily scooped.

Midrange Grind That Cuts Through

The Big Muff Pi 2 has a noticeable midrange character that helps riffs and lead lines retain their place within a band mix.

This is particularly useful when playing alongside:

• Distorted rhythm guitars

• Heavy drums

• Keyboards and synthesisers

• Layered studio tracks

• Additional modulation effects

• Bass-heavy amplification

Its mid-forward grind can provide greater definition than a deeply scooped fuzz sound while retaining the scale and harmonic density expected from a Big Muff.

Heavy Crunch at Lower Sustain Settings

The Big Muff Pi 2 does not need to be set to maximum gain to produce a powerful sound.

Lower Sustain settings create a heavy, textured crunch with more space around the notes and a clearer sense of pick attack. This makes the pedal effective for rhythm guitar, repeated riffs and parts that require more definition than a fully saturated fuzz sound.

Lower-gain settings are particularly useful for:

• Alternative-rock rhythm parts

• Garage-style guitar

• Heavy blues riffs

• Dynamic chord playing

• Fuzz and overdrive stacking

• Recording multiple guitar layers

Full Saturation and Singing Sustain

Turning up the Sustain control increases the distortion, compression and note length.

Higher settings create dense, speaker-pounding saturation suitable for huge power chords, sustained leads and feedback-driven textures.

The smooth compression helps individual notes continue beneath bends and vibrato, making the Big Muff Pi 2 equally capable as a rhythm fuzz and a lead sustainer.

Classic Big Muff Tone Control

The Tone control adjusts the balance between bass and treble.

Turning it anticlockwise increases the bass response and reduces treble, producing a deeper and woollier sound. Turning it clockwise increases treble while reducing bass, creating a sharper and more cutting response.

This allows the pedal to be adapted for:

• Bright single-coil pickups

• Darker humbuckers

• Clean or driven amplifiers

• Standard and lowered tunings

• Rhythm and lead guitar

• Sparse or heavily layered arrangements

Adjustable Output Volume

The Volume control sets the overall output level of the effect.

It can be used to match the bypassed instrument signal, create a level boost when the pedal is engaged or push the front end of an amplifier and subsequent gain pedals.

The available output also helps compensate for tonal changes made with the Tone control.

Soft-Touch Footswitch

The Big Muff Pi 2 uses a soft-touch footswitch rather than a traditional heavy mechanical switch.

This provides smooth and quiet physical operation while a mechanical relay handles the true-bypass signal switching.

The pedal therefore combines the signal-path benefits of true bypass with a more comfortable modern footswitch action.

Latching and Momentary Operation

A normal press and release of the footswitch toggles between effect and bypass in the conventional way.

Holding the footswitch for more than half a second creates a temporary change. The pedal returns to its previous state when the switch is released.

This can be used to:

• Add brief bursts of fuzz

• Accentuate individual chords

• Introduce momentary lead sustain

• Create short transitions between song sections

• Momentarily clean up an effected passage

• Produce rhythmic switching effects

The momentary-hold function can also be disabled, and the pedal remembers the chosen setting after being disconnected from power.

Mechanical-Relay True Bypass

The Big Muff Pi 2 uses a mechanical relay for true-bypass operation.

When bypassed, the active fuzz circuit is removed from the audio path. The status LED clearly indicates when the effect is engaged.

Compact Nano-Sized Enclosure

The pedal is housed in Electro-Harmonix’s compact Nano-sized chassis, measuring approximately 4.5 × 2.75 × 2.1 inches.

This makes it considerably easier to fit onto a modern pedalboard than a traditional large-format Big Muff enclosure.

The compact footprint leaves more room for:

• Tuner pedals

• Boosts and overdrives

• Modulation effects

• Pitch shifters

• Delay and reverb

• Loop switchers

• Additional fuzz pedals

Distinctive Daniel Danger Artwork

The enclosure features original artwork by illustrator Daniel Danger, giving the Big Muff Pi 2 a visual identity that reflects its unusual history and rediscovered circuit.

Why Choose a Dual-Op-Amp Fuzz Pedal?

Operational amplifiers can be used to create gain, clipping and signal shaping within an analogue distortion circuit.

The Big Muff Pi 2 uses two dual op-amps to produce a response that differs from the four-transistor architecture associated with many other Big Muff versions.

Its dual-op-amp design provides:

• Strong midrange character

• Fast and immediate attack

• Heavy crunch at lower gain

• Dense saturation at higher settings

• Extended sustain

• Consistent analogue distortion

• A rougher edge than smoother Muff variations

This makes the pedal particularly useful for musicians who want the weight and sustain of a Big Muff but prefer a more aggressive and less polished response.

Who Is the Electro-Harmonix Big Muff Pi 2 For?

Alternative-Rock Guitarists

The gritty mids and heavy crunch work particularly well for layered rhythm parts, aggressive choruses and contrasting clean-to-fuzz arrangements.

Grunge Players

The pedal can move from rough distortion to thick, compressed saturation, making it suitable for dynamic riffs and heavy power chords.

Shoegaze Musicians

High Sustain settings create a dense foundation for reverb, delay and modulation. Placing reverb before the pedal can produce especially broad and compressed walls of sound.

Psychedelic Guitarists

Long sustain, feedback and the momentary footswitch function make it an excellent tool for experimental lead sounds and evolving textures.

Heavy-Rock Players

The full-bodied response gives riffs plenty of weight, while the pronounced mids help retain definition alongside drums and bass.

Lead Guitarists

Higher Sustain settings produce compressed, singing notes that respond well to bends, vibrato and controlled feedback.

Rhythm Guitarists

Lower Sustain settings provide more attack and definition than a fully saturated fuzz sound, making the pedal useful for repeated riffs and chord-based playing.

Recording Musicians

Its unusual dual-op-amp character provides a distinctive alternative to transistor-based fuzzes when layering several guitar parts.

Existing Big Muff Users

Players who already own a traditional NYC, Ram’s Head, Green Russian or Triangle Big Muff will find that the Big Muff Pi 2 offers a noticeably different texture and midrange response.

Experimental Musicians

Momentary switching and the pedal’s rough harmonic edge make it suitable for abrupt sound changes, feedback manipulation and unconventional effects combinations.

What’s Included?

• Electro-Harmonix Big Muff Pi 2 fuzz pedal

• 9V battery

External power adapter not included.

Fair Deal Quality Control Assessment

Every effects pedal supplied by Fair Deal Music is checked by our experienced team before dispatch.

Our assessment includes:

• Enclosure and artwork inspection

• Input and output socket test

• Volume-control operation

• Full Tone-control range assessment

• Sustain-control operation

• Low- and high-gain sound check

• Latching footswitch operation

• Momentary footswitch operation

• Mechanical-relay true-bypass check

• Status LED inspection

• Battery operation

• External power input check

• Final presentation and packing inspection

Technical Specifications

General

Specification	Details
Effect Type	Fuzz, distortion and sustainer
Circuit Type	Analogue
Gain Architecture	Two dual operational amplifiers
Historical Design Period	Late 1970s
Audio Format	Mono
Bypass Type	Mechanical-relay true bypass
Footswitch	Soft-touch latching and momentary
Controls	Volume, Tone and Sustain
Enclosure	Nano-sized chassis
Artwork	Daniel Danger
Release Date	December 2025
Dimensions	4.5 × 2.75 × 2.1 inches
UPC	683274012728

Controls

Control	Function
Volume	Sets the overall effect output level
Tone	Adjusts the frequency balance from deep bass to high treble
Sustain	Controls the amount of distortion, compression and sustain
Footswitch	Selects effect or bypass and provides momentary operation
Status LED	Illuminates when the effect is active

Connections

Connection	Details
Input	¼-inch mono audio input
Input Impedance	117kΩ
Output	¼-inch mono audio output
Maximum Output Impedance	2.7kΩ
Power Input	Centre-negative DC barrel connection

Power Requirements

The Electro-Harmonix Big Muff Pi 2 can operate from the supplied 9V battery or a compatible regulated pedalboard power supply.

Specification	Details
Operating Voltage	9V DC
Current Draw	15mA
Polarity	Centre-negative
Battery Type	9V
Battery Included	Yes
Recommended Adapter	Electro-Harmonix 9.6DC-200mA
Minimum Recommended Supply Capacity	50mA
Maximum Permitted DC Input	12V
External Adapter Included	No

When operating from a battery, inserting a cable into the Input socket activates the pedal’s power. Disconnect the input cable when the pedal is not being used to preserve battery life.

Use a regulated power supply with the correct voltage and centre-negative polarity.

Where Should the Big Muff Pi 2 Be Placed?

There is no single correct pedal order, but the following positions provide useful starting points.

Near the Beginning of the Signal Chain

Placing the Big Muff Pi 2 after a tuner and before modulation, delay and reverb gives the fuzz a direct instrument signal.

Later effects can then process the complete distorted sound.

After an Overdrive or Boost

An overdrive placed before the Big Muff Pi 2 can tighten the bass, add additional midrange and drive the dual-op-amp circuit harder.

This is particularly useful for focused lead sounds and dense band arrangements.

Before an Overdrive

Placing an overdrive after the fuzz reshapes the complete Big Muff Pi 2 signal.

Depending on the overdrive used, this can add compression, reduce low-frequency looseness and create a more amplifier-like response.

Before Delay and Reverb

This conventional placement keeps the delay repeats and reverb tails clear around the fuzz sound.

It is an excellent starting point for sustained lead guitar and spacious rock tones.

After Reverb

Placing the Big Muff Pi 2 after reverb sends the complete ambient signal into the fuzz circuit.

This creates a dense, compressed and deliberately overwhelming texture suited to shoegaze and experimental music.

Electro-Harmonix Big Muff Pi 2 Compared with Other Big Muff Pedals

Big Muff Pi 2 vs Nano Big Muff Pi

The Nano Big Muff Pi reproduces the classic modern NYC Big Muff circuit with smooth, creamy sustain and a familiar scooped tonal balance.

The Big Muff Pi 2 uses a rediscovered dual-op-amp circuit with slightly lower gain, rougher edges and a more noticeable midrange grind.

Choose the Nano Big Muff Pi for the established NYC sound. Choose the Big Muff Pi 2 for a more unusual and aggressive Muff character.

Big Muff Pi 2 vs Op-Amp Big Muff Pi

Both pedals use operational amplifiers, but they are based on different circuit designs.

The Op-Amp Big Muff Pi recreates the production V4 circuit associated with the late 1970s and provides an aggressive, compressed response with switchable Tone Bypass.

The Big Muff Pi 2 is based on a separate Bob Myer design that was not originally released. It has its own lower-gain response, gritty mids and latching or momentary switching.

Big Muff Pi 2 vs Ram’s Head Big Muff Pi

The Ram’s Head is known for articulate string separation, smooth sustain and a refined vintage-style lead voice.

The Big Muff Pi 2 sounds rougher and more immediate, with greater midrange grind and less polished edges.

Choose the Ram’s Head for smooth vintage articulation. Choose the Big Muff Pi 2 for rawer alternative-rock character.

Big Muff Pi 2 vs Green Russian Big Muff Pi

The Green Russian has a strong low-frequency response and an earthy, muscular character that works especially well with bass and lower tunings.

The Big Muff Pi 2 places more emphasis on midrange grit and dual-op-amp crunch.

Choose the Green Russian for maximum low-end weight. Choose the Big Muff Pi 2 for a more cutting and unusual mid-forward voice.

Big Muff Pi 2 vs Triangle Big Muff Pi

The Triangle Big Muff recreates the earliest Big Muff design and offers an open, harmonically detailed response.

The Big Muff Pi 2 has a rougher edge, more modern switching and a distinctly different op-amp-driven feel.

Choose the Triangle for early vintage-style fuzz. Choose the Big Muff Pi 2 for rediscovered 1970s experimentation and greater midrange aggression.

Big Muff Pi 2 vs Big Muff Pi 2 with Tone Wicker

The Tone Wicker version uses the same core dual-op-amp gain design but adds switchable high-frequency filtering and full tone-circuit bypass.

The standard Big Muff Pi 2 is simpler and more immediate, retaining the essential Volume, Tone and Sustain layout.

Choose the standard model for direct operation. Choose the Tone Wicker model when additional treble and tone-circuit options are required.

Frequently Asked Questions

Is the Electro-Harmonix Big Muff Pi 2 analogue?

Yes. It uses an analogue fuzz circuit built around two dual operational amplifiers.

Is it officially called the Nano Big Muff Pi 2?

The official model name is Big Muff Pi 2. It is housed in Electro-Harmonix’s compact Nano-sized enclosure.

Is this the same as the Nano Big Muff Pi?

No. The Nano Big Muff Pi reproduces the familiar NYC Big Muff circuit.

The Big Muff Pi 2 uses a different dual-op-amp design originally developed during the 1970s.

How does the Big Muff Pi 2 sound?

It has the sustain and full-bodied character associated with the Big Muff family, but with slightly lower gain, rougher edges and a pronounced midrange grind.

Can it produce lower-gain distortion?

Yes. Lower Sustain settings create heavy crunch with greater attack and note definition.

Can it create saturated fuzz?

Yes. Increasing Sustain produces dense compression, thick harmonics and long note sustain.

What does the momentary footswitch function do?

Holding the footswitch for more than half a second creates a temporary change between bypass and effect. The pedal returns to its previous state when the footswitch is released.

Can momentary operation be disabled?

Yes. The momentary-hold function can be disabled, and the pedal remembers the chosen setting after it is powered down.

Does it use true bypass?

Yes. A mechanical relay provides true-bypass switching.

Is it suitable for rhythm guitar?

Yes. Its gritty mids and lower-gain crunch make it particularly effective for riffs, power chords and alternative-rock rhythm parts.

Can it be used for lead guitar?

Yes. Higher Sustain settings provide the compression and note length needed for sustained bends, vibrato and feedback.

Can it be used with bass guitar?

Yes. It can produce aggressive bass fuzz, although it does not include a dedicated clean blend. A parallel blender can be used when additional clean low end is required.

Can it run from a battery?

Yes. A 9V battery is included.

Is a mains adapter included?

No. A compatible regulated 9V centre-negative adapter is available separately.

Fair Deal Music Verdict

★★★★★ 5/5

The Electro-Harmonix Big Muff Pi 2 is an exciting addition to the Big Muff family that offers far more than a different enclosure or cosmetic design.

Its rediscovered dual-op-amp circuit delivers the scale and sustain expected from a Big Muff but introduces its own gritty midrange, rougher attack and slightly lower-gain feel. It sounds equally convincing as a heavy rhythm distortion, a saturated lead fuzz or an aggressive texture for experimental effects chains.

The soft-touch latching and momentary footswitch adds genuine performance flexibility, while the compact Nano-sized enclosure makes it easy to integrate into almost any pedalboard. For players who want a Big Muff with a less familiar and more mid-forward personality, the Big Muff Pi 2 is an outstanding choice.

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