MXR M133 Micro Amp

The MXR M133 Micro Amp is a classic guitar effects pedal designed to give your signal an extra boost without the complexity of a conventional overdrive or distortion pedal. Known for its simplicity, reliability and versatility, it has become a popular choice among guitarists looking to increase their volume for solos, add extra drive to an amplifier or maintain a strong signal throughout a complex effects chain. Its compact design and straightforward operation make it an excellent addition to almost any pedalboard.

At the heart of the Micro Amp is its ability to deliver up to 26dB of additional gain, providing a substantial increase in signal level when required. Unlike many overdrive pedals, its primary purpose is to boost your existing sound rather than introduce a completely different tonal character. This makes it particularly useful for bringing solos forward in a live mix, helping lead guitar parts stand out without losing the character of your guitar and amplifier. When used with a valve amplifier, the increased signal can also push the amp harder, producing additional natural saturation and sustain.

The pedal features an uncomplicated control layout with a single Gain knob, allowing you to adjust the amount of boost to suit your playing style. Lower settings provide a subtle increase in volume, while higher settings deliver a much more pronounced boost for powerful lead passages and heavier tones. This simplicity makes it easy to operate during performances, with no complicated menus or multiple controls to navigate. The Micro Amp can also be useful when switching between guitars with different output levels, helping balance the volume of instruments fitted with different pickup configurations.

Another useful application is compensating for signal loss in longer effects chains. Guitarists using several pedals, particularly in more elaborate setups, can use the Micro Amp to restore signal strength and maintain a consistent output. It can be positioned at different points in the signal chain depending on whether the aim is to increase overall volume or push another drive pedal or amplifier into greater saturation. This flexibility makes it useful for both straightforward home setups and more advanced live rigs.

Built into a durable metal enclosure, the MXR M133 is designed to withstand regular use on stage and in the rehearsal room. Its compact footprint allows it to fit comfortably alongside other effects, while the footswitch makes it easy to engage or bypass the boost whenever needed. A red LED indicates when the effect is active, and the pedal can be powered by a standard 9V battery or a compatible 9V DC power supply.

Combining straightforward controls, powerful gain and dependable construction, the MXR M133 Micro Amp remains a valuable tool for guitarists who want greater control over their signal level. Whether you need a dedicated solo boost, extra drive from your amplifier or a way to balance different guitars, it delivers a practical and effective solution in a compact, easy-to-use package.