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Dunlop produced the MC401-U as part of the MXR CAE line, positioning it as a dedicated boost and line driver pedal for players needing clean signal amplification and drive compensation in their signal chain.
The unit delivered up to 20 dB of boost gain with a stated noise floor exceeding 95 dB, making it suited to high-gain or studio-critical rigs where clean headroom mattered. Input impedance was rated at 1 kΩ and output impedance at 150 Ω, figures that bear directly on how the pedal interacts with buffers, passive pickups, and downstream amplifier inputs. True hardwire bypass kept the signal path unaffected when the unit was disengaged. Power requirements were 9 volts DC at 1.5 mA draw, placing it within the range of standard pedalboard power supplies.
Owners sourcing a replacement power supply should confirm polarity and voltage against the unit itself; a qualified guitar technician or electronics repair professional can assist with any signal-chain integration questions.
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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
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From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
