Pricing and availability

We compare 600+ stores and found this item at 3 stores. Prices updated .

Sweetwater
4.5 (11)
$249.00
Guitar Center
4.0 (4)
$249.00
Reverb
5.0 (15)
$249.00 New
$130.00 Used

Average Price: $219

High-end/Boutique

$60

$181+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 2 merchants for "Keeley Psi". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Discover the Keeley Psi, a fusion of op-amp and germanium fuzz stages that delivers a versatile range of tones, from silky vintage warmth to an aggressive, sludgy attack. This pedal, designed with the discerning guitarist in mind, brings together the best of both worlds, offering unparalleled control over your sound. Whether you're seeking to add a classic fuzz edge to your music or dive into heavier, more intense effects, the Keeley Psi stands ready to elevate your performance. Crafted with personal touches from Robert Keeley himself, this pedal is not just a tool but a gateway to sonic exploration.

Key Features:

  • Dual-stage fuzz design combining op-amp and germanium components for a wide range of sounds
  • Dedicated controls for volume, tone, and fuzz, allowing for precise sound shaping
  • Based on the iconic IC Muff circuit, offering a nod to classic fuzz tones with the flexibility for modern play
  • Personal appointments and attenuation by Robert Keeley, ensuring a unique and high-quality effect pedal experience

Product specs

Brand Keeley
Model Psi Fuzz
Finish Black / Red Graphic
Year 2010s
Made In United States
Categories Fuzz Pedals and Effects

FAQs

What are the different bass response modes on the Keeley Psi Fuzz?

The Keeley Psi Fuzz offers three bass response modes: Scoop, Punch, and Psi. These modes allow you to tailor the pedal's undertones, providing versatility in shaping your fuzz sound.

Does the Keeley Psi Fuzz have true bypass switching?

Yes, the Keeley Psi Fuzz features true-bypass switching, ensuring that your signal remains unaffected when the pedal is turned off. It also offers a silent buffered-bypass option, which can be switched on-the-fly.

Can the effect order be changed on the Keeley Psi Fuzz?

Yes, you can change the effect order on the Keeley Psi Fuzz by double-tapping the blend control. This allows you to switch between the Fuzz and Pitch-Shifter/Octave effect order.

Is the Keeley Psi Fuzz suitable for both guitar and bass?

The Keeley Psi Fuzz is designed to work well with both guitar and bass, thanks to its versatile bass response modes and robust fuzz capabilities.

ProGuitarShopDemos

ProGuitarShopDemos

Keeley Psi Fuzz

Video thumbnail for Keeley Psi Fuzz by ProGuitarShopDemos

Keeley Psi Fuzz

ProGuitarShopDemos

ProGuitarShopDemos

Video thumbnail for (Almost) Every Keeley Fuzz Pedal by The Pedal Bored

(Almost) Every Keeley Fuzz Pedal

The Pedal Bored

The Pedal Bored

Video thumbnail for NAMM '15 - Keeley Psi Fuzz, Katana Mini, Aurora Reverb, Compressor Pro Demos by Premier Guitar

NAMM '15 - Keeley Psi Fuzz, Katana Mini, Aurora Reverb, Compressor Pro Demos

Premier Guitar

Premier Guitar

Video thumbnail for Keeley Electronics Psi fuzz demo by Lance Seymour by Lance Seymour

Keeley Electronics Psi fuzz demo by Lance Seymour

Lance Seymour

Lance Seymour

Video thumbnail for Keeley Psi Fuzz by Jack Fossett

Keeley Psi Fuzz

Jack Fossett

Jack Fossett

Video thumbnail for Keeley PSI Fuzz by BeardTone

Keeley PSI Fuzz

BeardTone

BeardTone

Video thumbnail for Keeley Psi Fuzz guitar Pedal by musictoyznetwork

Keeley Psi Fuzz guitar Pedal

musictoyznetwork

musictoyznetwork

Video thumbnail for Keeley Psi Fuzz Demo by Jack Fossett

Keeley Psi Fuzz Demo

Jack Fossett

Jack Fossett

Video thumbnail for Keeley Psi Fuzz Short Tone Demo Opamp Big Muff Pedal by Jack Fossett

Keeley Psi Fuzz Short Tone Demo Opamp Big Muff Pedal

Jack Fossett

Jack Fossett

Reviews

PROS

  • Loud, raucous, and offers a thick sound across settings

  • Maintains reasonable note separation for a fuzz pedal

  • Delivers classic Black Sabbath tones to '60s vibes

  • Germanium circuit enhances quality and timbre of sound

  • Versatile with both Strat and Les Paul guitars

  • Provides lots of sustain with the cream knob

CONS

  • Voice knob functionality is limited, affecting EQ versatility

  • Cleaning up with volume knob may produce undesirable tones

  • Pedal's interaction with guitar volume may not meet traditional germanium fuzz expectations

  • Extreme settings produce a 'spitty' sound, not appealing to all

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Keeley Psi.

Comparisons

  • Some users compare the Keeley PSI Fuzz to the Earthquaker Devices Hoof, noting both are hybrid fuzz pedals but differ in component types (Germanium/Silicon vs. opamp/Germanium).

    Source

Use cases and applications

  • The PSI Fuzz is recommended for players seeking versatile fuzz tones beyond the distinctive Pumpkins sound achieved by the EHX Op Amp Reissue Big Muff.

    Source
  • An expression pedal can transform the PSI Fuzz into a Whammy effect, enhancing versatility and enabling Morello/White-style sounds, including the detune effect.

    Source
  • The pedal is noted for creating a "wall of sound" when paired with an Orange Rockerverb and a 4x12 setup.

    Source

User experience

  • Missed opportunities in purchasing have frustrated potential buyers, indicating high demand and limited availability, particularly in specific regions like the UK.

    Source
  • Owners describe the fuzz as thick and smooth, comparable to a Russian Big Muff but with increased output and tonal clarity, making it prominent in a mix.

    Source

Features and functionality

  • The PSI Fuzz offers a glitch-free octave feature with precise tracking and the ability to blend high and low octaves for rich, thick tones.

    Source
  • The dry signal can be turned off, allowing exclusive use of the octave effect, which performs well on both guitar and bass setups.

    Source

4.5 out of 5

Based on 0 Reviews and 4 Ratings

5 star
4 star
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2 star
1 star

Artist usage

Add artist
See how Larry "Ler" LaLonde uses Keeley Psi

Larry "Ler" LaLonde

Guitarist

Primus

...
Verified via Premierguitar

Board No. 2 is home to the Fractal MFC-101 Mark II Foot Controller, Keeley Psi Fuzz, Keeley Wolff Octave Fuzz, and a Keeley Dark Side Workstation.

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Keeley Psi, it is most commonly used with the following gear.

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Community setups

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