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Dunlop positioned the MXR Sub Machine Fuzz (M225) as a dual-character fuzz unit within the MXR effects line, combining a shaggy fuzz circuit with a growling sub octave section. A mode switch allowed the two circuits to run in series or in parallel, and a separate octave-up fuzz mode extended the unit's range toward upper-register saturation.
The pedal operated on a standard DC 9-volt supply, drawing 7 mA. Bypass was buffered, with a noise floor of −100 dBV and a maximum input of 2.5 dBV. Input impedance was rated at 1 MΩ and output impedance at less than 600 Ω, placing it within typical signal-chain compatibility for passive and active instruments alike.
Owners tracing replacement footswitches, knobs, or power supply requirements for this unit should consult a qualified guitar technician or effects technician, who can cross-reference the original Dunlop/MXR hardware specifications against currently available service parts.
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The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.
Specs only go so far. What actually fits, what breaks first, what the factory got right and what everyone ends up changing — that lives with the people who own them, not in a datasheet. Post what you know and it stays on this page for whoever comes looking next.
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Dunlop
Dunlop
Dunlop
Dunlop
Dunlop
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Since 2007
