Vintage 1980s MXR M133 Micro Amp Pre Effect Pedal

This vintage 1980s MXR Micro Amp is a classic analog clean boost designed to add extra gain and output while preserving the natural character of your guitar and amplifier. Featuring an incredibly simple single-knob Gain control, the Micro Amp can provide everything from a subtle volume lift to a powerful boost that pushes a tube amp into natural overdrive. Its straightforward circuit and responsive feel make it equally useful for boosting solos, adding presence to lower-output pickups, compensating for signal loss in larger pedalboards, or driving the front end of an amplifier harder. Known for its warm, musical response and no-nonsense design, the Micro Amp has remained a pedalboard staple for decades. This vintage 1980s example delivers the unmistakable simplicity and utility that made the original MXR design a favorite among working guitarists. A great addition for vintage pedal collectors or players looking for a versatile, old-school analog boost with plenty of practical applications.