The MXR Micro Amp M133 is a simple yet powerful boost pedal designed to add a preset amount of gain to your guitar signal. With a single knob, it increases volume for solos, balances output between guitars, or compensates for signal loss in long effect chains. Its transparent boost preserves your natural tone, making it a versatile tool for any setup.

• Footswitch for on/off operation with red LED indicator
• Single Gain knob adjusts the boost level
• Transparent boost that preserves your guitar’s tone
• Ideal for solo volume increases, matching output between guitars, or driving amps harder
• Compact, pedalboard-friendly design
• Works with all electric guitars and standard 9V DC power

• Controls: Gain (single knob)
• Footswitch: True bypass with LED indicator
• Power: 9 V DC center-negative (adapter not included)
• Current Draw: 4 mA
• Circuit: Analog clean boost
• Enclosure: Rugged metal housing
• Dimensions: Standard MXR compact pedal size
• Manual: Click here.