MXR Micro Amp M133 Guitar Effect Pedal

The Ultimate Clean Boost. Unleash Your Amplifier's Full Potential.

Sometimes, the most powerful tool in your signal chain isn't a distortion or a modulation—it's the one that simply makes everything sound bigger, bolder, and more alive. The MXR M133 Micro Amp is the legendary clean boost that has been a staple on professional pedalboards for decades. Whether you need to push your amp into natural tube saturation, drive your other pedals harder, or give your solos that extra cut through the mix, the Micro Amp delivers a staggering +26dB of pure, transparent gain without altering your core tone.

Pure, Transparent Signal Boosting

The Micro Amp is renowned for its ability to increase your signal level while preserving every nuance of your guitar's natural character and your amplifier's voice. It adds no coloration, no distortion, and no unwanted noise—just more of what you already love about your sound. The result is a massive, punchy, and dynamic signal that feels like your amp just got a serious upgrade.

Maximum Headroom and Versatility

With a simple, intuitive single-knob interface, the Micro Amp puts extraordinary power at your fingertips. The single rotary control adjusts the boost level, providing up to +26dB of clean gain, effectively giving you the headroom and punch of a high-end studio preamp. This extreme output capability makes it perfect for:

• Driving your tube amp: Push the front end of your amplifier into sweet, singing overdrive without needing a separate distortion pedal.

• Boosting other pedals: Slamming an overdrive or distortion pedal with increased level results in tighter, more aggressive, and harmonically rich tones.

• Soloing: Instantly jump out of the mix with a massive volume bump that cuts through any band.

• Compensating for signal loss: Recover lost high-end and level from long cable runs or buffered signal chains.

Two Placements, Infinite Possibilities

The Micro Amp is incredibly flexible in its signal chain placement. Place it before your other pedals to push them harder for a more intense and saturated effect. Place it after your gain pedals to use it purely as a volume or lead boost. Many players even use it in an amplifier's effects loop to create a master "more" control for their entire rig.

A Secret Weapon for Rack Systems

The Micro Amp is equally effective as a studio tool. It can provide that coveted "front-end" drive for solid-state power amps, function as an external line driver, or even be used as a mini-mixer preamp. It adds weight and punch to any instrument or rackmount system with professional results.

Built for the Long Haul

Housed in MXR's legendary, road-ready die-cast metal chassis, the Micro Amp is built to survive years of gigging and studio work. The hardwire bypass ensures your signal remains pure and transparent when the effect is disengaged. Its compact, space-saving design makes it a perfect fit on any pedalboard.