Pricing and availability
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Store
Reviews
Price
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
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What are the different bass response modes on the Keeley Psi Fuzz?
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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.
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Does the Keeley Psi Fuzz have true bypass switching?
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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.
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Can the effect order be changed on the Keeley Psi Fuzz?
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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.
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Is the Keeley Psi Fuzz suitable for both guitar and bass?
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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.
Videos
ProGuitarShopDemos
Keeley Psi Fuzz
Reviews
PROS
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Loud, raucous, and offers a thick sound across settings
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Maintains reasonable note separation for a fuzz pedal
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Delivers classic Black Sabbath tones to '60s vibes
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Germanium circuit enhances quality and timbre of sound
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Versatile with both Strat and Les Paul guitars
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Provides lots of sustain with the cream knob
CONS
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Voice knob functionality is limited, affecting EQ versatility
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Cleaning up with volume knob may produce undesirable tones
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Pedal's interaction with guitar volume may not meet traditional germanium fuzz expectations
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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
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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
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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.
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An expression pedal can transform the PSI Fuzz into a Whammy effect, enhancing versatility and enabling Morello/White-style sounds, including the detune effect.
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The pedal is noted for creating a "wall of sound" when paired with an Orange Rockerverb and a 4x12 setup.
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User experience
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Missed opportunities in purchasing have frustrated potential buyers, indicating high demand and limited availability, particularly in specific regions like the UK.
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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
4.5 out of 5
Based on 0 Reviews and 4 Ratings
Artist usage
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Used With
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Community setups
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