The Land Devices HP-2 Harmonic Percolator is a fuzz pedal built as a Harmonic Percolator equivalent, using Germanium diode clipping1. Delicious Audio describes it as "a fuzz powered by Germanium diode clipping" that "can go from mild overdrive to face melting fuzz," with what the site calls rich even-order distortion that is fat and warm1.
Land Devices lists both the standard HP-2 Percolator and the HP-2 Percolator in Scream, a green finish, as sold out on its product pages as of October 202624. Guitar Pedal X reports that every batch of the pedal sells out quickly5.
The controls
The HP-2 follows the original Harmonic Percolator layout: two knobs and a switch, with no dedicated gain or tone control in the classic design65. Land Devices describes what each control does on its product page2:
| Control | What it does |
|---|---|
| H (harmonics) | Adjusts the input gain, from clean boost to broken speaker2 |
| B (balance) | Sets the output level, letting you tame or unleash the chaos2 |
| Rocker switch | Left for '70s-inspired saturation, right for face-melting aggression2 |
Delicious Audio's Paolo De Gregorio describes the switch in practical terms: "the switch on the right lets you choose between the stock tone and a louder but less compressed one"1. Pedal of the Day calls the two positions the stock setting for the original circuit and "Doom" mode, with higher output and a fatter, more modern type of tone3. Guitar Pedal X labels the two sides of the clipping switch "70's / Absolute Destruction"5.
One quirk worth knowing before you plug in: Land Devices warns that if you turn either knob fully counterclockwise, your signal disappears entirely2.
From the Interfax Harmonic Percolator HP-1
The HP-2 traces back to the Interfax HP-1 Harmonic Percolator, a fuzz whose circuit is unusual among germanium designs. Aion FX notes that the Harmonic Percolator uses clipping diodes, unlike most germanium fuzzes, and that it pairs a PNP germanium transistor with an NPN silicon transistor, which lets it run in a standard negative-ground configuration rather than the positive ground many vintage germanium fuzzes require72.
The original went through several circuit changes over its production run, and Aion FX identifies two known versions, "stock" and "Albini," the latter referring to recording engineer Steve Albini's unit, which was traced with several different component values from any other known example7. Premier Guitar, reviewing a related pedal, notes the original offered just two controls, balance and harmonics, with no dedicated gain or tone control6.
Land Devices put the HP-2 together as a modern reproduction of that circuit, keeping the two-knob format and adding the mode switch8. The HP-2 has been offered in two finishes: the standard HP-2 Percolator and the HP-2 Percolator in Scream, a green version4.
What reviewers said
Published reviewers have been positive about the HP-2. Guitar Pedal X's Stefan Karlsson calls it "another which has been incredibly well-received over the years - and for which every batch sells out super quick," adding that most players really rate and love it overall5.
"Cheers to the Land Devices crew for a job well done - we can't wait to see what they come up with next!"
Pedal of the Day also credited the pedal's silicon and germanium transistors with giving off "rich layers of sound that add presence and power to any rig or setup"3. The HP-2 has been "incredibly well-received over the years - and for which every batch sells out super quick"5, and Pedal of the Day closed its look at the HP-2 with "Cheers to the Land Devices crew for a job well done - we can't wait to see what they come up with next!"3.
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Questions
What does the doom switch do on the HP-2?
The toggle switch selects between two modes. With the switch to the left you get the stock setting, the original Harmonic Percolator circuit. With the switch to the right you get Doom mode, which is louder and less compressed, with a fatter, more modern tone. Land Devices describes the two sides as '70s-inspired saturation versus face-melting aggression.
Is the Land Devices HP-2 a clone of the Interfax Harmonic Percolator?
It is a modern reproduction of the Interfax Harmonic Percolator HP-1, a fuzz from the 1970s. Land Devices built the HP-2 around the same circuit, keeping the two-knob control layout of the original, and adding a mode switch that the original did not have.
Does the HP-2 use germanium diodes?
Yes. Delicious Audio describes the HP-2 as a fuzz powered by germanium diode clipping, and Pedal of the Day reports that it uses silicon and germanium transistors together. That mix follows the original Interfax circuit, which paired a PNP germanium transistor with an NPN silicon one.
Where is the Land Devices HP-2 made?
The HP-2 is hand-built in Oakland, California, by Land Devices. The company sells it directly through its own webstore, where it is currently listed as sold out.
Is the Land Devices HP-2 sold out?
Yes. As of late October 2026, Land Devices lists both the standard HP-2 Percolator and the HP-2 Percolator in Scream green finish as sold out on its product pages. Guitar Pedal X has noted that every batch of the pedal sells out quickly.
Sources (8)
- Land Devices HP-2 Harmonic Percolator, Delicious Audio, 2023-07-31
- HP-2 - Percolator - Land Devices, Land Devices
- Land Devices HP-2 Distortion, Pedal of the Day, 2018-12-21
- HP-2 - Percolator in Scream - Land Devices, Land Devices
- Guitar Pedal X, Guitar Pedal X, 2024-05-13
- Electro-Harmonix EHX Percolator Review, Premier Guitar, 2026-09-19
- Particle Vintage Fuzz / Interfax Harmonic Percolator, Aion FX, 2021-02-19
- WHAT IS A LAND DEVICE?, JHS Pedals
