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Dunlop produced the MXR Micro Amp (M133-U) as a compact, single-knob clean boost pedal within the MXR effects line. Its purpose was straightforward: to raise the signal level of an instrument or effects chain without introducing coloration, making it a utility unit suited to driving an amplifier harder or compensating for level differences between patches or instruments.
The M133-U offered a gain range of +0.5 dB to +26 dB via a single gain control, with a frequency response of 20 Hz to 20 kHz (+0 dB, -1.4 dB) indicating a design aimed at transparency across the full audible range. Input impedance was rated at 1 MΩ and output impedance at 470 Ω, with a maximum output level of +6 dBV and a noise floor of -80 dBV. The bypass mode was hardwire. The unit drew 2.5 mA from a 9-volt DC power supply.
Owners sourcing a compatible power supply should confirm a regulated 9-volt DC centre-negative source meeting the 2.5 mA draw requirement. For any internal service, switch replacement, or signal-path troubleshooting, a qualified guitar technician or electronics technician familiar with effects pedal circuitry is the appropriate resource.
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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
