






🎸 Boost your tone, own the stage—no compromises.
The Jim Dunlop M133 MXR Micro Amp Pedal is a compact, battery-powered analog signal booster featuring a single gain knob for easy volume control and a red LED footswitch for clear on/off status. Designed to seamlessly balance output between different guitars or add a consistent boost in long effect chains, it’s proudly made in Benicia, California, and built for professional musicians seeking reliable, portable performance.





| Product Dimensions | 14.99 x 11.68 x 6.86 cm; 362.87 g |
| Batteries | 1 9V batteries required. |
| Item model number | M133 |
| Body Material | Plastic, Metal |
| Colour | White |
| Connector | 1/4 inch (6.35mm) audio jack |
| Hardware Interface | 1/4-inch Audio |
| Signal Format | Analog |
| Country Produced In | USA |
| Size | 0 |
| Power Source | Battery Powered |
| Voltage | 9 Volts |
| Item Weight | 363 g |
R**N
MXR
This is an excellent pedal and great for boosting signal for riffs
M**T
Best clean boost pedal on the market
You really can't go wrong with this pedal, at the end of the day John Frusciante uses it and you can't really say much more than that.Simply put, it adds more 'meat' to your base tone, chords ring clearer and single notes sing longer and louder. Doesn't change your tone in any way per se, just somehow 'improves' it almost imperceptibly.It's a fairly subtle effect for the price admittedly, but in my opinion entirely worth it!
J**.
An effect which gets straight to the point!
MXR don’t disappoint, this is another well built, no nonsense piece of kit. It boosts your signal just as it should, with no added noise .It’s small, powerful and simple to operate, they’ve been around a long time, there’s a reason for that!
R**N
Epic clean boost switch
Fantastic piece of kit... used in effect loop it gives enormous amounts of boost with negligible colouring of sound.
J**E
Preamp or no preamp
This effect seems to be quite subtle at first but I can imagine after prolonged use it becomes indispensable...
P**L
Classic pedal, great boost
Used this into my Marshall dsl20cr to push the tubes a bit without more volume. Does the job well
A**Y
Great pedal, nearly always use this
Great pedal, nearly always use this, provides a nice boost and does not lose any clarity to the sound (if anything, makes it clearer).
C**Y
Class pedal
Makes a substantial difference and you can get some very dirty, fuzz sounds from this pedal
Trustpilot
3 weeks ago
3 days ago