The EarthQuaker Devices Rancho de la Luna Dirt Transmitter is a limited-edition silicon fuzz pedal built by EarthQuaker Devices in collaboration with the Rancho de la Luna studio in California. It is a special run of the company's Dirt Transmitter Fuzz Driver, a circuit EarthQuaker describes as Fuzz Face inspired, using lower-gain silicon transistors that the maker says have a warmth similar to germanium when overdriven1. The pedal is no longer in production: 1,600 units were made worldwide, with 160 allocated to the UK23.
The idea for the original Dirt Transmitter started when EarthQuaker founder Jamie Stillman came across some unusual silicon transistors. The first Dirt Transmitters shipped in January 2008 in a small enclosure with only three controls: Fuzz, Tone and Level. Shortly after release, Stillman added the external Bias control, which EarthQuaker says opened up the circuit1. The Rancho de la Luna edition follows the larger V1 Legacy Reissue and puts the expanded circuit in a compact V2-style case with custom artwork by Mike Egan3.
A Fuzz Face-inspired silicon fuzz
The circuit is a two-transistor fuzz derived from the classic Fuzz Face. MusicRadar's reviewer Connor Flys described it as "Fuzz Face-derived, with a couple of extra controls"2, and Guitar Pedal X's Stefan Karlsson called it "a very Fuzz Face adjacent circuit as far as I'm concerned - with some extra components to make it more malleable"26.
What sets it apart from a straight Fuzz Face copy is the transistor choice and the Bias control. EarthQuaker says the rare, lower-gain silicon transistors combined with starved voltage "creates a wide variety of textures at the turn of a knob"1. Guitar.com's reviewer Richard Purvis found the pedal produced warm, thick, high-powered fuzz with a moderate treble response, a well-rounded bottom end, and mids with "the smooth, slightly scooped character of a classic Fuzz Face"5. Guitar Pedal X's round-up of 2025's best new fuzz pedals noted it covers overdrive, fuzzy-drive and full-on fuzz tones, "with a rawer, raspier output than the classic two-transistor Fuzz"3.
The controls: Level, Fuzz, Tone and Bias
Four knobs and a footswitch cover everything4.
| Control | What it does |
|---|---|
| Level | Sets the overall volume of the effected signal7 |
| Fuzz | Clockwise for heavier tones, counterclockwise for lighter tones1 |
| Tone | EQ shaping, tilting the balance between bass and treble2 |
| Bias | Adjusts the voltage fed to the transistors2 |
The Bias knob is the pedal's signature control. EarthQuaker explains that it affects the voltage to the transistors: counterclockwise it creates more gated Velcro fuzz tones, clockwise it gives thicker, more natural fuzz, and the circuit is properly biased at 5 o'clock1. MusicRadar's Jonathan Horsley put it in practical terms: "If you want your fuzz to sound full and open, keep the Bias control fully dimed at 5 o'clock. As you back it off, you choke the voltage entering the fuzz circuit"8. Gearnews described the result as "a distinct, sputtery, ripping velcro tone that becomes more pronounced and characterful" the further the knob is rolled back9.
Delicious Audio's review of the original Dirt Transmitter found the interaction between Bias and Tone especially useful, concluding that "Due to the particular interaction between the Bias control and Tone knob, this one goes under the versatile category"7.
Momentary fuzz and the Flexi-Switch
The soft-touch footswitch hides an extra function. A normal press latches the effect on, but holding the switch down engages the fuzz only for as long as you keep it held, so short blasts of fuzz are possible without double-tapping2. Guitar World's reviewer Trevor Curwen highlighted this: "if you'd like to dish out the dirt in short blasts, the pedal's Flexi-switch allows momentary action as well as standard latching"4.
The switching is relay-based true bypass, which EarthQuaker calls Flexi-Switch Technology. Because the relay needs power to operate, the pedal requires power to pass signal, so it cannot sit unpowered in a chain1.
Power
The pedal takes a standard 9V DC power supply with a 2.1mm negative center barrel, drawing 3mA, and EarthQuaker warns not to run it at higher voltages12. There is no battery option; the relay-based bypass means it needs a powered output on your pedalboard at all times1.
The relay-based true bypass requires power to pass signal. Without a 9V DC supply connected, the pedal will not pass your guitar signal, so plan a dedicated pedalboard output for it rather than expecting it to work unpowered like a mechanical true-bypass pedal1.
The Rancho de la Luna edition and its history
The Rancho de la Luna edition is a collaboration with the Joshua Tree, California studio of the same name, celebrating the studio's 30th anniversary recording sessions with Stillman, who mostly used a Dirt Transmitter for those recordings3. Gearnews also names Dave Catching of the studio in connection with the collaboration9. The pedal is adorned with the studio's logo and custom artwork by Mike Egan inspired by the studio and its desert surroundings23.
The Dirt Transmitter line has appeared in several forms over the years:
- 2008 original: small enclosure, three controls (Fuzz, Tone, Level), first shipped January 20081
- 2008 update: external Bias control added shortly after release1
- 2024 Legacy Reissue: limited run in a larger enclosure like the 2008 original2
- 2025 Rancho de la Luna edition: compact standard-sized case with the studio artwork, 1,600 units23
The edition was priced at $179 in the USA and £189 in the UK when reviewed in 202624; guitar.com listed it at $189/£189 in August 202524, so published prices differ between dates. Guitar Pedal X's reviewer paid £189 at Andertons in the UK3.
What reviewers said
Published reviewers were positive across the board. MusicRadar's Connor Flys called it "an intelligently modified take on the beloved Fuzz Face, which offers enhanced usability and sonic shaping"2. Guitar World's Trevor Curwen listed a wide range of fuzz sounds, the Bias control, the artwork, the compact size, volume-knob clean-up and a low noise floor among the reasons to buy4. Guitar Pedal X's Stefan Karlsson found it "sounds really potent - with an immense level of gain, and really handy output shaping via Bias and Tone"10.
"If you're looking for an intelligently modified take on the beloved Fuzz Face, which offers enhanced usability and sonic shaping"
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Questions
Is the Rancho de la Luna Dirt Transmitter still made?
No. EarthQuaker Devices lists the pedal as no longer in production. It was a limited run of 1,600 units worldwide tied to the Rancho de la Luna studio's 30th anniversary, so once sold through retailers it was gone. The standard Dirt Transmitter circuit has also appeared in other reissues.
What does the Bias knob do on the Dirt Transmitter?
Bias adjusts the voltage fed to the transistors. Fully clockwise at 5 o'clock the circuit is properly biased for a full, open fuzz. Backing it off starves the transistors, producing progressively more gated, sputtery velcro fuzz tones that many players use for texture and rhythm effects.
Can the Dirt Transmitter be used as a momentary fuzz?
Yes. Its Flexi-Switch footswitch works both ways: a normal press latches the effect on, while holding the switch down engages the fuzz only for as long as you keep it pressed. That makes short blasts of fuzz possible without tapping twice.
Does the Dirt Transmitter pass signal without power?
No. The switching is relay-based true bypass, and the relay needs power to operate, so the pedal requires a 9V DC supply to pass signal at all. It cannot run on a battery and needs its own powered pedalboard output.
How is the Rancho de la Luna edition different from the standard Dirt Transmitter?
It carries custom artwork by Mike Egan inspired by the Rancho de la Luna studio and its Californian desert surroundings, plus the studio's logo, where the standard pedal does not. Circuit-wise it follows the compact V2 format with Level, Fuzz, Tone and Bias controls rather than the larger V1 Legacy Reissue enclosure.
How many Rancho de la Luna Dirt Transmitters were made?
1,600 units worldwide, of which 160 were allocated to the UK. The run was a collaboration with the Rancho de la Luna studio celebrating its 30th anniversary recording sessions, and EarthQuaker Devices has since discontinued the pedal.
Sources (10)
- Rancho de la Luna Dirt Transmitter, EarthQuaker Devices, 2008-01
- “Even without its connection to the studio, it's simply a killer fuzz pedal”: EarthQuaker Devices Dirt Transmitter, MusicRadar, 2025-07-23
- Guitar Pedal X, Guitar Pedal X, 2025-06-19
- EarthQuaker Devices Rancho de la Luna Dirt Transmitter review, Guitar World, 2025-09-03
- EarthQuaker Devices Rancho de la Luna Dirt Transmitter review, guitar.com, 2025-08-20
- Guitar Pedal X, Guitar Pedal X, 2024-09-16
- Beautiful Reissues: Earthquaker Devices Dirt Transmitter, Delicious Audio, 2025-06-19
- “There was talk about doing a pedal release in conjunction with the album, and the Dirt Transmitter was the perfect fit”: EarthQuaker Devices joins forces with Dave Catching of Rancho de la Luna to bring back an old EQD fuzz classic, MusicRadar, 2025-06-18
- Rancho de la Luna Dirt Transmitter: EQD Desert Fuzz, gearnews.com, 2025-06-18
- Guitar Pedal X, Guitar Pedal X, 2025-12-08
Dave Catching
