The Mocker UL730 Fuzz Circuit is a fuzz distortion pedal from Aclam that replicates the built-in fuzz circuit of a 1966 Vox UL730 amplifier, serial number 3042. Aclam states the circuit uses Philips OA200 diodes, "The same Philips diode type used in the original VOX UL series."1 Pedal of the Day called it "a seemingly simple three-knob fuzz distortion" and judged that getting such a unique sound out of a rare amp and putting it into pedal form, all while staying true to the original sound and tone, is no easy feat, and that Aclam managed to pull it off.2
Where the circuit comes from
The gray Hammerite enclosure is a deliberate nod to the '60s British fuzzboxes the circuit sits alongside in history.2
| Circuit detail | The Mocker |
|---|---|
| Modeled on | Internal fuzz circuit of the 1966 Vox UL730, S/N 30421 |
| Diodes | New Old Stock Philips OA2001 |
| Diode lineage | "The same Philips diode type used in the original VOX UL series"1 |
| Scope | An extended version of the original Vox UL series fuzz circuit2 |
Controls and tones
The Mocker carries Bias and Tone controls for a wide range of fuzz tones.2 Pedal of the Day highlighted the Bias control as "capable of landing on so musical terrains, from vintage to modern, by tweaking a single knob," and summed up the pedal's range as "ready to nail the tones from the '66s and '67s era plus many more."2 For players chasing mid-1960s British fuzz sounds, that places The Mocker among the fuzz pedals built around period circuits rather than modern reinterpretations.
| Control | What it does |
|---|---|
| Bias | Pedal of the Day describes it as landing on many musical terrains, from vintage to modern, by tweaking a single knob2 |
| Tone | Part of the wide range of fuzz tones the pedal covers2 |
Production history
That clarification matters for anyone comparing a used early unit with a current one: the diode batches differ, and the enclosure changed. Aclam's own product page carries the company's account of the production history.1
Videos
R.J. Ronquillo
Pedal of the Day and Aclam Guitars
Juo Det
Questions
What amp is the Aclam The Mocker based on?
The Mocker is a faithful replica of the built-in fuzz circuit of the 1966 Vox UL730 amplifier, serial number 3042, the amp Aclam found and purchased in September 2017. Aclam describes the pedal as reproducing that circuit, and Pedal of the Day called it a faithful replica of the internal fuzz circuit of Aclam's own Vox UL730.
What does the Bias knob do on The Mocker?
Pedal of the Day describes the Bias control as capable of landing on so many musical terrains, from vintage to modern, by tweaking a single knob. Together with the Tone control it gives the pedal a wide range of fuzz tones, and the maker positions it as covering the tones of the 1966 and 1967 era plus many more.
Was The Mocker a limited edition?
Yes. When Aclam launched The Mocker in November 2023 it was limited to 200 units and priced at $299. In July 2026 Aclam clarified the production history: the original 200-pedal run used the first batch of New Old Stock OA200 diodes, a second genuine NOS batch was later found, and the current version has an updated enclosure without Smart Track side holes.
What diodes does The Mocker use?
The Mocker uses New Old Stock Philips OA200 diodes, the same type used in the original Vox UL series. Aclam states the pedal follows the built-in fuzz circuit of its 1966 Vox UL730 amplifier, serial number 3042, which used Philips OA200 diodes as in the original VOX UL series.
What era of fuzz tones is The Mocker meant to cover?
Pedal of the Day describes The Mocker as ready to nail the tones from the '66s and '67s era plus many more, referring to the mid-1960s British fuzz sounds associated with the Vox UL series amp it is modeled on. The Bias and Tone controls extend the range from vintage to modern.
Sources (2)
- The Mocker Effect Pedal. Buy it at Aclam's Store, Aclam Guitars
- Aclam The Mocker UL730 Fuzz Circuit, Pedal of the Day, 2024-01-02
