MXR Micro Amp M133 Bundle PS A1

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MXR Micro Amp M133 Bundle PS A1

MXR

Micro Amp M133 Bundle PS A1

4.8 Expert Rating

Product Info

Article Number: 495338
Brand: MXR
Model: Micro Amp M133 Bundle PS A1
Price: $122.10

* Prices may vary. Check retailer for current pricing and availability.

The MXR Micro Amp is a clever little tool for guitarists who love their amp's inherent tone but need a bit more push for leads or solos. It’s a clean gain booster—not a distortion pedal—so it’s perfect for those wanting to amplify existing character without changing the core amp sound. A real winner for classic rock and blues players.

Product Description

MXR Micro Amp M133 Bundle PS A1

*Bundle offer comprising*, MXR Micro Amp M133

*Pedal Preamp*

  • Guitarists never tire of looking for more and more great pedals to tweak their distortion sound
  • but what if the amp already sounds great but could do with a bit more gain? Overdrives and treble boosters would alter the frequency response - not desirable in this case. This is exactly where the MXR Micro has been just the thing for many years - without distorting the sound
  • the amp gets exactly the kick it was missing; ideal for getting a powerful lead sound out of old Marshalls
  • Fenders and Voxes without messing up their beloved characteristic sound.
  • Adjustable boost
  • Can equalise the different output of two guitars
  • Prevents signal loss in long effects chains
  • Gain control
  • status LED
  • Hardwire Bypass
  • Sturdy metal housing
  • Operation with optional 9V battery or optional 9V power supply - Art. #409939# (not included)
  • Rockboard Pedalsafe Type A1 universal
  • *Protective Cover*
  • Suitable for Electro Harmonix Nano series and MXR effect pedals with standard housing with 1 input and 1 output jack
  • Suitable for most effect pedals with housing dimensions of approx. 110 x 60 x 32 mm
  • With base plate for mounting on pedalboards of any manufacturer
  • Protects effect pedals from dirt and weather influences
  • Protects the settings from unintentional adjustment
  • Mounts effect pedals securely on almost all pedalboards
  • No permanent modifications required
  • Includes universal pedal mounting plate type A and silicone adhesive pad
PROS
  • • Provides clean gain boost without altering amp's core character.
  • • Excellent for boosting vintage amps like Marshalls, Fenders, and Voxes.
  • • Equalizes output discrepancies between different guitars effectively.
  • • Compact size makes it pedalboard-friendly and easy to integrate.
CONS
  • • Limited tonal shaping beyond gain adjustment.
  • • Relies heavily on the existing amp's sound quality.
  • • True bypass might introduce slight noise depending on the chain.

Product Video

Key Features

Effect Type Clean Boost / Preamp
Controls Gain, Status LED
Bypass Type True Bypass
Power Supply 9V DC (PS A1 power supply included)
Connections 1/4 in Instrument Input, 1/4 in Output, DC Power Input
Dimensions 4.75 in x 2.75 in x 1.75 in

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Frequently Asked Questions

It’s likely to be less impactful on a high-gain amp already saturated with distortion, as it’s designed for cleaner amplification.
The PS A1 is a standard 9V power supply, but compatibility with other pedals depends on their individual power requirements and current draw.
Unlike a treble booster which can drastically alter frequency response, the Micro Amp aims for a more controlled, even boost, preserving the amp’s original tonal balance.

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