The JAM Fuzz Phrase Si is a silicon fuzz pedal from JAM Pedals, a BC107-based circuit from the Greek boutique brand built in the Fuzz Face style, whose 14 circuit components compare with the classic Fuzz Face's 111. It is the silicon counterpart to the germanium JAM Pedals Fuzz Phrase, and it sits in JAM Pedals' standard line of pedals, described at launch as "the newest addition to their standard line of pedals"2.
JAM Pedals says it arrived at the BC107 after testing various silicon transistors, then fine tuned the circuit around them. The company describes the result as striking "a perfect balance between sought-after tonal characteristics, long sustain across the register and 'clean-ability' rivalling the best vintage germanium fuzz circuits"3. Delicious Audio calls it "a Silicon version of the Fuzz Phrase LTD" and notes that the Fuzz Phrase "captures the essence of the best Germanium circuits"4.
A Fuzz Face circuit on BC107 transistors
The Fuzz Face is a famously simple circuit. Guitar Pedal X notes that the classic Fuzz Face uses just 11 circuit components, while the JAM version carries 141. The difference is part of how JAM Pedals tuned the circuit to the BC107 silicon transistors it settled on after what the company describes as meticulous testing of various silicon options3.
Silicon transistors behave differently from the germanium parts in the original Fuzz Face and in the earlier Fuzz Phrase: they are less sensitive to temperature and bias drift, which is part of why JAM Pedals moved to them when germanium stocks ran out1. The pedal keeps the two-knob, fuzz-and-volume format players associate with the Fuzz Face, with bias adjustment moved inside the enclosure.
Controls and the internal bias trimmer
The Fuzz Phrase Si has one external control plus an internal trimmer:
| Control | What it does |
|---|---|
| Level | Adjusts the pedal's output volume, while also allowing for versatile tonal shaping3 |
| Internal trimmer | Sets transistor bias, factory-set at 4.5V5 |
The internal trimmer is the bias control that Fuzz Face circuits depend on. Guitar World's reviewer notes "there's an internal trimmer to adjust bias"5, and it ships set to 4.5V from the factory5. Players who want to experiment with the gated, splatty sounds of an off-bias fuzz can open the pedal and turn it, while those who leave it alone get the factory setting.
From the germanium Fuzz Phrase to the Si
The Fuzz Phrase Si carries the Fuzz Phrase line forward in silicon, listed at $2295. Of its germanium predecessor, one reviewer wrote that "The former Fuzz Phrase was one of the best sounding Germanium Fuzz Faces out there, but its lack of external Bias control somewhat held the reviewer off overall"1, a lineage the Si continues with the BC107-based circuit.
The germanium line did not disappear entirely. The Black Fuzz Phrase LTD, a limited edition in the germanium line, was offered with free shipping6. Reviewers covering Fuzz Face style pedals have noted the two circuits side by side, with the silicon Fuzz Phrase Si joining the germanium version in the JAM Pedals range7.
The Fuzz Phrase Si and the JAM Pedals Black Fuzz Phrase LTD are different pedals. The LTD is a germanium limited edition produced in small batches, each a one-of-a-kind hand-painted piece6, while the Si is the silicon BC107 version in the standard line623.
Custom artwork editions
Alongside the standard finish, JAM Pedals sells the Fuzz Phrase Si as a series of custom artwork versions: "Achenbach", "Bad TV", "Black Data", "IT", "Luminous", "Mandala", "Relic" and "Shards". JAM Pedals describes these as "Same sound, different artwork"38. Each is a one-of-a-kind hand-painted piece, and the pedal you receive will differ in detail from the photos shown3.
- JAM Pedals "Achenbach" Fuzz Phrase Si
- JAM Pedals "Bad TV" Fuzz Phrase Si
- JAM Pedals "Black Data" Fuzz Phrase Si
- JAM Pedals "IT" Fuzz Phrase Si
- JAM Pedals "Luminous" Fuzz Phrase Si
- JAM Pedals "Mandala" Fuzz Phrase Si
- JAM Pedals "Relic" Fuzz Phrase Si
- JAM Pedals "Shards" Fuzz Phrase Si
The custom artwork versions are listed at £294.00 on JAM Pedals' own store3, against the standard version's $229 / £259 / €263 pricing reported by Guitar World5.
What reviewers said
Reviewers took to the Fuzz Phrase Si's sound and presentation, praising "this fuzz's combination of simplicity, swagger, and style"9. One verdict summed up the pedal as "It ain't cheap but it's superlative"5. The pedal was also the subject of a Premier Guitar First Look demo video10.
Guitar World's Jonathan Horsley reviewed the BC107-based circuit in 2026 and summed it up bluntly5:
"It ain't cheap but it's superlative"
Jonathan Horsley, Guitar World5
Videos
Premier Guitar
JAM pedals
JAM pedals
Questions
Is the JAM Fuzz Phrase Si true bypass?
Yes. JAM Pedals lists the Fuzz Phrase Si as true bypass, so with the pedal off your signal passes through without buffering or coloring. This applies to the standard pedal and to all of the custom artwork versions.
How is the Fuzz Phrase Si different from the Fuzz Phrase LTD?
The Fuzz Phrase Si is the silicon version of the germanium Fuzz Phrase LTD, built on BC107 silicon transistors instead of germanium ones. JAM Pedals launched it in 2024 after germanium transistor stocks for the Custom Shop Fuzz Phrase ran out, and it joined the standard line of pedals rather than the limited edition runs.
What transistors does the JAM Fuzz Phrase Si use?
It uses BC107 silicon transistors. JAM Pedals says it arrived at the BC107 after testing various silicon transistors, then fine tuned the circuit around them to keep the character associated with the Fuzz Phrase line.
How much current does the Fuzz Phrase Si draw?
JAM Pedals lists power consumption at 3 mA. It runs on a 9V battery or a 9V DC adapter with a tip-negative plug, so it is easy to power alongside other standard pedals.
Sources (10)
- Guitar Pedal X, Guitar Pedal X, 2024-03-29
- JAM Pedals Unveils Fuzz Phrase SI, Premier Guitar, 2024-03-28
- Fuzz Phrase Si, JAM Pedals (jampedals.com)
- JAM Pedals Fuzz Phrase Si, Delicious Audio, 2024-07-23
- Strymon Canoga Vintage Silicon Fuzz review, Guitar World, 2026-06-22
- Black Fuzz Phrase LTD, JAM Pedals (www.jampedals.com)
- Best Fuzz Face Clones And Evolutions In 2024, Delicious Audio, 2024-04-17
- “Black Data” Fuzz Phrase Si, JAM Pedals (jampedals.com)
- JAM Fuzz Phrase Si Guitar Pedal Review, Premier Guitar, 2024-10-02
- Nikos Arvanitis Fuzz Face Demo: Unleash the Thrills, Premier Guitar, 2024-05-09
