The EHX Percolator offers tones ranging from raunchy overdrive to ripping heavy fuzz. Featuring Drive/Fuzz modes, latching/momentary footswitch function, & internal trim pot for added control
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Born from a legendary 1970s Milwaukee repair shop circuit so rare and mysterious that the originals were literally gooped shut to protect their secrets, the EHX Percolator is a cult-classic fuzz and overdrive pedal brought back to life with modern controls and zero apologies. From warm, chewy overdrive to full-on face-ripping fuzz destruction, the Percolator is the kind of pedal that makes your amp think it just had an existential crisis — in the best possible way.
Tone That Bites Back
The core of the Percolator's character is its asymmetrical clipping circuit, which leans hard into even-order harmonics to produce tones that feel alive and reactive under your fingers. This isn't a pedal that sounds the same whether you're barely grazing the strings or digging in like you've got a point to prove. It responds to your dynamics the way a great tube amp does — musically, organically, and with just a little danger lurking underneath.
Asymmetrical Clipping: Even-order harmonic emphasis gives the Percolator its distinctive, almost vocal quality — smooth when you want it, gnarly when you push it.
DRIVE/FUZZ Toggle: Flip to DRIVE mode for a raw, transistor-style crunch that's chewy and crunchy. Hit FUZZ mode to engage the clipping diodes and unleash tones that sit somewhere between "boutique" and "chaos."
Dynamic Response: The Percolator reacts to your picking attack in real time, meaning light strumming stays clean and expressive while heavy playing opens up into explosive, saturated fuzz.
Three Knobs. Infinite Trouble.
Simplicity is the Percolator's secret weapon. Three knobs and a single toggle — no menus, no presets, no 47-page manual required. What looks like a modest control set actually unlocks a near-infinite tonal landscape, ranging from gentle, sweet drive all the way to velcro-gated fuzz madness that sounds like your signal chain is coming apart at the seams (intentionally, of course).
HARMONICS Knob: Controls the input gain from overdrive territory into full fuzz destruction. Think of it as the dial between "warm and friendly" and "please call someone."
BIAS Control: Sets the bias of the gain circuit, producing everything from smooth drive to pseudo-octave fuzz to stuttering, gated tones with a velcro-like decay that's uniquely unsettling in the best way.
BALANCE Knob: Sets the overall output level of the effect, keeping you in control of how loud your chaos actually gets on stage.
Hidden Depths (And We Mean That Literally)
Under the hood, the EHX Percolator has a few more tricks up its sleeve for players who like to go deeper than the front panel allows. An internal trim pot lets you dial in sub-octave content and push the circuit's gain even further for massive, rumbling distortion. And because not every moment on stage calls for a full-commitment fuzz blast, the footswitch offers a Momentary mode that lets you dip in and out of the effect for quick bursts of sonic insanity without any footswitch acrobatics.
Internal Trim Pot: Hidden inside the enclosure, this little guy lets you enhance sub-octave content and crank the gain circuit even further for earth-shaking distortion with extra low-end rumble.
Latching/Momentary Footswitch: A standard click latches the effect on or off. A press-and-hold activates Momentary mode — hold it down for fuzz, lift your foot and it snaps back to bypass instantly.
Mechanical Relay True Bypass: When the Percolator is off, it's truly off — your signal passes through completely unaffected with zero tone coloration or signal loss.
The Pedal That History Tried to Keep a Secret
The EHX Percolator takes a legendary, hard-to-find circuit that spent decades hiding in obscurity and turns it into something you can actually get your hands on — and your boots on. Whether you're chasing the woolly, harmonic richness of classic rock tones or pushing into genuinely unhinged fuzz territory, this pedal delivers with a personality that's equal parts history and attitude. It earns its place on your board not by being the loudest or the flashiest, but by being genuinely, unapologetically itself.
Electro-Harmonix Percolator Features:
Modern reissue of a rare, cult-classic Milwaukee pedal circuit from the 1970s
Asymmetrical clipping with even-order harmonic emphasis for dynamic, interactive tones
HARMONICS knob controls input gain from overdrive to full fuzz
BIAS control adjusts the gain circuit for smooth drive, pseudo-octave, and gated fuzz sounds
BALANCE knob sets overall output level
DRIVE/FUZZ toggle engages or disengages the clipping diodes
Internal trim pot for enhanced sub-octave content and additional gain
Warranty: 1 Year; This manufacturer does not offer a warranty on Non-Factory Resealed, Dent and Scratch, Minor Blemished, Factory B-Stock items.
Frequently Asked Questions
In DRIVE mode, the clipping diodes are disengaged, giving you a raw, organic transistor-style overdrive that's chewy and crunchy. In FUZZ mode, the diodes engage for heavier, more saturated fuzz tones ranging from smooth sustain to gated velcro fuzz.
The BIAS knob adjusts the operating point of the gain circuit, unlocking a wide range of tones from smooth overdrive to pseudo-octave effects and stuttering gated fuzz. Small adjustments can dramatically change the character of the pedal, so it rewards experimentation.
The internal trim pot lets you boost the sub-octave content and increase the overall gain of the circuit beyond what the front-panel knobs allow. It's ideal for players who want extra low-end rumble and even more aggressive distortion.
The Percolator covers a wide tonal range. In DRIVE mode with the HARMONICS knob dialed back, it can produce warm, low-gain overdrive tones with real character. It's a versatile pedal, not a one-trick fuzz machine.
Yes, the Percolator uses Mechanical Relay True Bypass, meaning your signal passes through completely uncolored when the pedal is disengaged. It also features a Momentary footswitch mode for quick, on-the-fly fuzz bursts without affecting your bypass state.
