Information
MXR
This device adds a preset amount of gain, using a single control. With a guitar, this lets you boost your signal for lead work, adjust between two different guitars with unmatched output (i.e., humbucker to single coils), or it can supply a permanent boost in a long effects chain where signal drop off is a problem.
Power: Single 9 volt battery or Dunlop ECB-003 AC adapter
Controls: Footswitch toggles amp on/bypass (red LED indicates on) Gain knob adjusts total output volume when micro amp is engaged
- 4-3/8" x 2-3/8" x 1-1/4"
- 0.9 lbs.
- White
Video
(2009-06-12) MXR Micro Amp by pedaltone.co.uk
(2010-06-09) Stompbox Walkthrough Video: MXR Micro Amp by GearWire
(2011-03-04) GEAR UP: MXR M133 Micro Amp by TMNtv
(2011-05-26) MXR Micro Amp by UpsizingGear
(2011-12-30) MXR Micro Chorus FX Pedal Demo by TheToneshack
(2012-04-10) [????] 574? Todays Gear MXR ??? ???? ?? M133 by Today's Gear
(2012-10-12) MXR M133 Micro Amp HD by jackgriffithsmusic
(2013-02-04) Micro Ampli MXR - Turbo Guitar #58 by TurboGuitarChannel
(2016-05-26) MXR Micro Amp Boost Pedal by reverbmarket
(2017-04-14) Sound like John Frusciante - Ep. 1 - MXR Micro Amp by Triungulo Lab
(2021-08-27) MXR | M133 Micro Amp by Eko
(2024-09-26) The EFFECTOR BOOK Vol.65 "BOOSTER" Movie by Jake Cloudchair by The Effector Book
Reviews
myFXDB user reviews
1 review, average score of
| Date | User | Version | Score | Positive | Negative |
|---|---|---|---|---|---|
| 2015-07-30 | wakan777 | 8/10 | ... | ... |
Documentation
- article (technical analysis, ElectroSmash)
- diy project (Tonepad)
- manual (MXR)
- schematics (Free Info Society)

