MXR M173 CLASSIC 108 FUZZ
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Manufacturer Information
MXR
https://www.jimdunlop.com
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A "silicon" fuzz in the tradition of great classics
The MXR Silicon Fuzz captures the spirit of legendary fuzzes that shaped psychedelic rock, blues-rock, and heavy garage rhythms: a circuit with a clear character, featuring the typical silicon attack (more bite and stability) and a natural compression that makes notes sing. The BC-108 inspired Fuzz Face vibe is immediately noticeable: it's a fuzz that loves to be played "old school," interacting with guitar volume and amp, but with modern refinements to stay reliable and practical on stage.
Who is this fuzz pedal for?
This MXR is aimed at guitarists who want a vintage sound without spending hours tweaking: perfect if you're looking for a fuzz to drive a stoner riff, dirty up an indie/garage verse, thicken a blues-rock lead, or unleash a psychedelic sustain wall. Its pedal format and immediate usability suit both beginners (simple controls, quick results) and seasoned musicians seeking an effective fuzz for live use and easy placement in studio settings.
It works particularly well with single-coil pickups to recover that sharp, snappy edge, but it can also get massive with humbuckers by pushing the input of an already slightly driven amp. On a pedalboard, feel free to place it early in the chain (like many fuzzes of this family), then use the guitar volume to shift from a rough quasi-clean to a thick saturation.
Technical specifications
| Effects | Distortion / Overdrive / Fuzz, Fuzz | EQ | No |
| Technology | Analog | Settings | output, fuzz |
| Format | Pedal | Type | sector |
| Inputs | Jack | Use | guitar |
| Outputs | Jack | Color | Green |
| True bypass | Yes | Power supply included | No |
| Switch | Buffer | Power supply | 9V battery, DC 9 V |
Questions frequently asked
What sound does the MXR M173 Silicon Fuzz produce?
Its analog circuit, inspired by the BC-108, delivers a biting attack and natural compression, characteristic of silicon transistors. The Fuzz control ranges from gritty crunch to thicker saturation, with pronounced sustain.
Does the fuzz respond to the guitar's volume?
The saturation level decreases when lowering the guitar volume, revealing a clearer sound with a rough halo.
Where should this fuzz be placed in a pedalboard with a wah wah?
Placement at the start of the chain is suitable for this family of fuzz pedals. The Buffer switch helps to limit undesirable interactions when a wah wah is placed before the pedal. This function can also provide a more sustained signal feel in the chain.
What power supply is required for the MXR M173?
It requires a 9 V battery or a 9 V DC power source, not included. The stated current consumption is 2.2 mA.
What controls and connections are available?
Two potentiometers, Output and Fuzz, adjust the output level and saturation intensity respectively. Inputs and outputs use jacks, with true bypass and an activation LED.



