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Dunlop produced the MXR Distortion+ (M104-U) as a compact hardwire-bypass distortion pedal within the MXR effects line. It occupied the foundational end of the distortion category, designed to cover a range from mild overdrive character through to higher-gain distortion textures.
The M104-U operates on a 9-volt DC supply, drawing 2.5 mA — a modest current requirement compatible with standard pedal power arrangements. Input impedance is rated at 1 MΩ and output impedance at 25 kΩ. The circuit delivers a distortion gain range of 10 dB to 45 dB at 1 kHz, with a nominal input level of -22 dBV, a maximum output level of -14 dBV, and a noise floor of -74 dBV. Signal routing uses hardwire bypass.
Owners sourcing replacement hardware or investigating signal chain compatibility should consult a qualified guitar technician or electronics repair specialist, particularly when addressing power supply configurations or bypass switching components.
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Dunlop
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Dunlop
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From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
