Pricing and availability
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Average Price: $93
Standard/Professional
$60
$151+
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Budget
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Price History
Based on price data from 5 merchants for "MXR M133 Micro Amp". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Unleash the full potential of your sound with the MXR M133 Micro Amp. This compact, yet powerful pedal is like your guitar rig's personal assistant, expertly managing your gain levels. Whether you're switching between guitars with mismatched outputs or battling signal drop-off in a long effects chain, the Micro Amp's got your back. Its single control knob provides a preset amount of gain, offering an instant boost for your lead work or a permanent lift in your effects chain.
By pushing your tube amp into its sweet spot, the Micro Amp not only elevates your volume but also helps you achieve that coveted golden tone. And the best part? It does all this without distorting your beloved characteristic sound. So, whether you're playing on an old Marshall, a Fender, or a Vox, the Micro Amp ensures your leading sound shines through.
Key Features:
- Footswitch toggles amp on/bypass
- Red LED indicates "on"
- Gain knob adjusts total output volume when micro amp is engaged
- Power: Single 9-volt battery or Dunlop ECB-003 AC adapter (sold separately)
- Tough, compact metal enclosure
- Adjustable boost perfect for switching between guitars with unmatched output
- Great for use with long signal chains, or anytime signal drop-off is a problem
- Hardwire bypass
- Made in USA
Product specs
| Pedal Type | Gain Boost |
| Analog/Digital | Analog |
| Inputs | 1 x 1/4" |
| Outputs | 1 x 1/4" |
| Bypass Switching | True Hardwire |
| Power Source | 9V DC power supply (sold separately) |
| Power Usage | 2.5mA |
| Batteries | 1 x 9V |
| Height | 2.12" (including knobs) |
| Width | 2.62" (including jacks) |
| Depth | 4.37" |
| Weight | 0.74 lbs. |
FAQs
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What is the primary function of the MXR M133 Micro Amp?
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The MXR M133 Micro Amp is designed to boost your guitar signal, providing a consistent gain increase for soloing or balancing output levels between different guitars.
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Does the MXR M133 Micro Amp color the tone of my guitar?
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No, the MXR M133 Micro Amp is known for its transparent boost, meaning it increases your signal without altering the original tone of your guitar.
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Can the MXR M133 Micro Amp be used with bass guitars?
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Yes, the MXR M133 Micro Amp works well with bass guitars, offering a clean boost that enhances your signal without losing low-end frequencies.
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What power options are available for the MXR M133 Micro Amp?
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The MXR M133 Micro Amp can be powered using a 9V DC power supply or a 9V battery, providing flexibility for different performance settings.
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Is the MXR M133 Micro Amp suitable for use in long effects chains?
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Yes, the MXR M133 Micro Amp is ideal for long effects chains as it can compensate for signal loss, maintaining consistent output throughout the chain.
Equipboard's Expert Review
Equipboard tested this
Subtle Boost with Big Impact
The MXR M133 Micro Amp is a reliable and straightforward boost pedal that packs a punch despite its simple design. It has a solid metal construction and high-quality components, which gives us confidence in its durability for long-term use.
The single knob control is refreshingly simple, allowing us to dial in just the right amount of boost without fuss. We found it versatile enough to use with both clean and distorted tones, making it an excellent choice for various playing styles and setups.
Sound-wise, the Micro Amp delivers a clean boost that adds warmth and fullness to your tone. In our experience, it excelled at making solos stand out and balancing weaker pickups. However, we did notice that it's not entirely transparent, adding a slight coloration to the sound and rolling off some highs. This wasn't necessarily a drawback for us, as it often resulted in a pleasing, more rounded tone.
We think the MXR M133 Micro Amp is ideal for guitarists looking for a simple, reliable boost pedal that can add punch and clarity to their sound. It's particularly well-suited for players who appreciate a slight warming effect on their tone. However, those seeking an absolutely transparent boost or requiring more advanced features might want to look elsewhere. Despite its simplicity, we found the Micro Amp to be a valuable addition to our pedalboard, offering a subtle yet impactful boost that can enhance your overall sound.
Videos
ProGuitarShopDemos
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MXR Micro Amp Boost Pedal
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Jack Griffiths
MXR Micro Amp Boost Pedal | Reverb Demo Video
Reverb
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ProGuitarShopDemos
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Pedal Tone
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tunnelvisionmusic
I tried the LOUDEST guitar pedal on Earth | MXR Micro Amp Review
Anndy Negative
"MXR Micro Amp M133" vs "MXR CAE MC401 Boost / Line Driver"
Kev_k_ life
Reviews
PROS
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Simple one-knob operation for ease of use
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Provides clean, transparent boost without altering tone
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Can warm up tone slightly at higher settings
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Solid metal construction ensures durability
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Versatile; works well with both clean and distorted tones
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Effective for making solos stand out in a mix
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Can be used to boost signal strength on large pedalboards
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Enhances the sound of overdrive and fuzz pedals when placed before them
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Suitable for both live performances and recording
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Can help equalize volume differences between guitars with different pickups
CONS
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Some users find the boost not entirely transparent, slightly colors tone
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High gain settings can introduce a bit of noise
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Not true bypass; may affect signal when off
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Price may be considered high for a pedal with only one function
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Battery access requires unscrewing the back panel
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Some users expected more functionality beyond a simple boost
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about MXR M133 Micro Amp.
Use cases and applications
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Functions as an "always on" pedal for many users, enhancing sound quality with flat EQ and no gain boost, especially effective for single coils.
Source -
Provides a significant mid boost for lap steel when switching from guitar, with low/high rolled off and gain increased.
Source -
Positioned before Tone Bone Plexitube to create a meaty, clean distortion with gain set at 0 on the Plexitube and Micro Amp at 3 o'clock.
Source -
Utilized in FX Loop as a volume boost, demonstrating versatility in different pedalboard configurations.
Source -
Effective for pushing tube amps into a natural breakup, adding compression and character without additional noise, particularly with amps that have lower headroom.
Source -
Utilized in high-gain setups to enhance amp's natural overdrive, especially with amps already near their maximum volume, as noted with Fender Supersonic 22 and Marshall 2525C.
Source -
Placing the Micro Amp before fuzz and overdrive enhances mids and doesn't overly affect the fuzz, providing a versatile sound for varied genres.
Source
Features and functionality
User experience
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The Micro Amp is praised for preserving note definition and sparkle while adding crunch, making it ideal for replicating John Frusciante's tone on tracks like "Can't Stop."
Source -
Some users replace the pedal after a decade of use, indicating long-term reliability but potential wear over time.
Source
Comparisons
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Preferred over JHS Prestige and Xotic EP by some users for providing a pure, unfiltered volume boost without altering the tone with extra fatness or treble.
Source -
Some owners regret selling older models from the '80s due to nostalgia and perceived quality, seeking replacements despite their affordability.
Source
4.5 out of 5
Based on 43 Reviews and 290 Ratings
153
Reliable
I use it to boost the signal (clean) and it works perfectly. It increases the volume a lot and, as far as I use it (halfway), it doesn't dirty the sound.
This review has been translated automatically into English. See original
128
Needed more, got more
My bass is very quiet, but I love it. So I slapped this one on my board, and I got more of my bass, and I love it.
MXR Micro Amp
With this booster, you can have a lot of pedals and a really extensive line of cables without losing the body and qualities of your sound.
This review has been translated automatically into English. See original
78
Simple and Effective
Really simple yet effective Boost Pedal. One of a rare pedals that doesn't kill the tone of your guitar.
166
MXR Micro Amp
Its an alright pedal, but not worth the money, gives the sound a little boost but wouldn't recommend it.
93
The only thing it's supposed to do is a boost. What's wrong with it?
Artist usage
Add artist
Used with Foo Fighters "around the time of the second album", as stated by guitar tech Earnie Bailey in this August 21, 2017 Effects Bay interview.
What was the typical set up for Dave in those days?
A ProCo Turbo Rat into a 100 watt Marshall JCM800, a black Gibson Explorer, an 80’s tobacco Sunburst Les Paul Standard and a white Les Paul Custom is the earliest setup I can recall. A Boss DM-2 delay and MXR Micro Amp were added around the time of the second album.
A mainstay on John Frusciante's pedalboard, his MXR M-133 Micro Amp Pedal can be seen in the bottom row of this pedalboard from circa 2006 (Stadium Arcadium era). It is to the right of his Big Muff Pi. The photo is from Guitar Player magazine, November 2006 issue. Photo credit David Lee.
This photo of Jack White's pedalboard shows he uses the MXR M-133 Micro Amp (top right of the board).
He has also placed an MXR M-133 Micro Amp inside of a couple guitars. From an interview in GuitarPlayer:
"I had a couple of guitars made for the Raconteurs. I designed a Gretsch “Triple Jet” by adding a third pickup to a Double Jet, and putting an MXR Micro Amp inside the guitar. You can instantly get an overdriven sound by clicking on that pickup. You can just plug into an amplifier. If it’s time to play a solo and break out a little more, just click that switch on the guitar."
The pedal was mentioned in the 2019 Premier Guitar interview.
Alex Turner uses a MXR Micro Amp on his board as a boost to his clean signal or to boost the drive of his amp/overdrives for solos. Turner uses the pedal when playing in both Arctic Monkeys as it has been seen in every tour/ recording session since their second album and also during the second Last Shadow Puppets tour.
Adding a preset amount of gain with just a single control, the Micro Amp is a great way to boost the signal for lead work or adjust between two different guitars with unmatched output such as humbuckers to single-coils. It can also provide a permanent boost in a long effects chain where signal drop off is a problem.
Pictured is Turner’s pedal board early during the “Humbug” era in 2009. The Mirco Amp can be seen mid-board next to Alex’s Vintage TS808 Tube screamer.
In a photo from "Green Day Pictures: The Early Days, 1987-1993" on Greendayauthority, Billie Joe Armstrong is seen with an MXR M133 Micro Amp pedal.
Flea uses the MXR M-133 Micro Amp Pedal as a clean boost when doing leads, or slapping (it's shown at 5:47 into this video).
The MXR M-133 can be seen in this photo of Mac DeMarco's setup at a show in Rio de Janero.
You can clearly see the MXR M-133 Micro Amp in this photo of Noel Gallagher's pedalboard.
Adam Jones' MXR M-133 pedal can be seen at 1:42 in this video.
Used on Joe Satriani, as is visible in the documentary Reel starting at 4:18.
This is a picture from Prince’s Guitar Book released by Paisley Park. You can see the MXR Micro Amp pedal on the right side.
Album Usage
The MXR M133 Micro Amp has been featured on the following albums:
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use MXR M133 Micro Amp, it is most commonly used with the following gear.
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