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MXR M-133 Micro Amp Pedal

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The MXR M-133 Micro Amplifier Pedal adds a preset amount of gain, using a single control. With a guitar, this lets you boost your signal for lead wor...Click To Read More About This Product

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OVERVIEW

When you need a little boost.

The MXR M-133 Micro Amplifier Pedal adds a preset amount of gain, using a single control. With a guitar, this lets you boost your signal for lead work, adjust between 2 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 the Micro Amp is engaged.


Reviews
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Review Snapshot

by PowerReviews
MXRM-133 Micro Amp Pedal
 
4.9

(based on 47 reviews)

Ratings Distribution

  • 5 Stars

     

    (42)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Excellent sound quality (13)
  • Compact (12)
  • Responsive (12)
  • Versatile (4)

Cons

No Cons

Best Uses

  • Performances (13)
  • Outdoor events / games (7)
  • Home studio (6)
  • Professional recording (6)
  • Amateur recording (4)
    • Reviewer Profile:
    • Experienced (11), Professional musician (5)

Most Liked Positive Review

 

Does what it should and then some!

This pedal is great. I was looking for something to boost my overdrive tone when I switch out of rhythm into leads. I use a Boss SD-1 super overdrive pedal for a lot...Read complete review

This pedal is great. I was looking for something to boost my overdrive tone when I switch out of rhythm into leads. I use a Boss SD-1 super overdrive pedal for a lot of lead stuff, but I also like it for rhythm- this makes it tricky when I don't want to change my tone necessarily, but I need to boost into a lead riff that can cut through the mix (and jump over a drummer who makes brushes sound like broad-swords.) My other distortion is a ProCo You Dirty Rat, but it's too sustain-y to use as a base tone on most songs and I use it mostly as an accent effect for really heavy fuzz or long sustained bends, etc. I'm playing through a Peavey Express 112 (yeah, I know) so obviously the distortion tone coming from the gain channel is worthless. BUT, the clean tone is pretty decent and I'm broke, which is why I still don't have a Fender twin reverb or similar. Anyway, I was going to buy yet another distortion pedal (m78?) so I could have a base distortion and a lead OD but then I found the M-133 and my problems disappeared. Basically, it makes you louder when you need to be. End of story. Super simple, and good at what it does. But it DOES warm up your tone a bit... I happen to LOVE the subtle, subtle change, but be warned, it is there. I found that running it before my SD-1 gave me the best boost sound for that pedal- just a bit more sparkle, warmth, and fullness without any extra sustain or squeeze- sort of like a compressor without the compression, I guess. Same thing goes for my clean tone and clean with reverb. I did notice that it doesn't do much for my ProcoYDR, but all that fuzz makes it hard to tell.
Basically, I bought it to drive my clean reverby tones and my SD-1 and I couldn't be happier with it.
I give it five stars here because even though it only has one knob, it's pretty versatile! Doesn't change your tone, but it does warm it up just slightly at higher gain, and frankly, it sounds GREAT.
Metal case feels super solid, input/output jacks and the 9V recepticle are all snug. Knob doesn't wiggle.
Well, I got lucky and got mine pretty cheap from a guy who bought it from MF and never used it, but even at the retail price I'd say it's a good deal, because it does it's job well and really isn't that expensive. I'd buy it new again if something happened to mine.

VS

Most Liked Negative Review

 

Review

This pedal does not 'make your guitar louder' when activated. At least the one I got doesn't. When activated on a clean channel, all the way 'down' - no change, turn...Read complete review

This pedal does not 'make your guitar louder' when activated. At least the one I got doesn't. When activated on a clean channel, all the way 'down' - no change, turn up the knob, it adds distortion??? Not exactly what the product claims it does. Maybe mine's broke. ??

Reviewed by 47 customers

Displaying reviews 1-20

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(7 of 7 customers found this review helpful)

 
5.0

Does what it should and then some!

By Jonny Reb

from Central Coast, California

See all my reviews

Ask me a question

Comments about MXR M-133 Micro Amp Pedal:

This pedal is great. I was looking for something to boost my overdrive tone when I switch out of rhythm into leads. I use a Boss SD-1 super overdrive pedal for a lot of lead stuff, but I also like it for rhythm- this makes it tricky when I don't want to change my tone necessarily, but I need to boost into a lead riff that can cut through the mix (and jump over a drummer who makes brushes sound like broad-swords.) My other distortion is a ProCo You Dirty Rat, but it's too sustain-y to use as a base tone on most songs and I use it mostly as an accent effect for really heavy fuzz or long sustained bends, etc. I'm playing through a Peavey Express 112 (yeah, I know) so obviously the distortion tone coming from the gain channel is worthless. BUT, the clean tone is pretty decent and I'm broke, which is why I still don't have a Fender twin reverb or similar. Anyway, I was going to buy yet another distortion pedal (m78?) so I could have a base distortion and a lead OD but then I found the M-133 and my problems disappeared. Basically, it makes you louder when you need to be. End of story. Super simple, and good at what it does. But it DOES warm up your tone a bit... I happen to LOVE the subtle, subtle change, but be warned, it is there. I found that running it before my SD-1 gave me the best boost sound for that pedal- just a bit more sparkle, warmth, and fullness without any extra sustain or squeeze- sort of like a compressor without the compression, I guess. Same thing goes for my clean tone and clean with reverb. I did notice that it doesn't do much for my ProcoYDR, but all that fuzz makes it hard to tell.
Basically, I bought it to drive my clean reverby tones and my SD-1 and I couldn't be happier with it.
I give it five stars here because even though it only has one knob, it's pretty versatile! Doesn't change your tone, but it does warm it up just slightly at higher gain, and frankly, it sounds GREAT.
Metal case feels super solid, input/output jacks and the 9V recepticle are all snug. Knob doesn't wiggle.
Well, I got lucky and got mine pretty cheap from a guy who bought it from MF and never used it, but even at the retail price I'd say it's a good deal, because it does it's job well and really isn't that expensive. I'd buy it new again if something happened to mine.

(7 of 8 customers found this review helpful)

 
5.0

wonderful volume kick and lead pedal

By Gregg Helmich

from IA

Comments about MXR M-133 Micro Amp Pedal:

9
I love how this pedal only has one knob to deal with. It does a great job of representing the original tone or sound while amplifying it, either in clean or distorted modes.
So far, so good.
Not sure what's in the "guts" to warrant the price, but it sure does a great job with it's design intent.

(5 of 5 customers found this review helpful)

 
5.0

EUREKA !! EUREKA !! SEARCH IS OVER !!

By The Renegade

from Indiana

See all my reviews

Comments about MXR M-133 Micro Amp Pedal:

I had looked for a unit that I could change from rhythm to lead quickly....After playing in groups for many years---I suddenly found myself as a "solo" act in March 2010 and was desperate--by accident I stumbled onto this unit that solved my problem!! Best addition that I've ever had in a pedal. Smooth change from rhythm, while singing, to doing a guitar solo. I highly recommend this pedal and have advised other to purchase---you can't go wrong for a most economical "problem solver"....if something should happen to mine I would order another ASAP.

(5 of 5 customers found this review helpful)

 
5.0

little wonder

By Motoven Baezart

from Annapolis, MD

See all my reviews

Comments about MXR M-133 Micro Amp Pedal:

this has to be one of my favorite effects of all time. want to be a little louder for a solo or an intense part of a song, without having a sound man that knows all your parts, or imagine, no sound man at all? just step on this little guy. I love the simplicity of it as well, makes a three knob boost seem a little overdone. Other clean boosts will give different characters of sound in front of a distortion pedal or distorted amp, or as a level boost, but this MXR unit really shines at "just making it louder" without much of any coloration, which is very often just what I want. It makes a good dirty boost too, in front of a fuzz pedal like the Fingerprint. for me this is an essential effect in most of my gigging rigs.

(4 of 4 customers found this review helpful)

 
4.0

Bluesman

By Bobby Blackmon

from Orlando, Fl

Comments about MXR M-133 Micro Amp Pedal:

Works fine, wish it had come with an AC Power Adapter. Highly recommend this pedal.
Very simple and easy to use; Ilike that in a pedal.
Seems to be sturdy....only time will tell.
Could have cost a little less because it's just to boost the gain and nothing else.

(3 of 3 customers found this review helpful)

 
5.0

Great little boost pedal!

By Lee

from SC

About Me Professional Musician

See all my reviews

Ask me a question

Pros

  • Compact Design
  • Excellent Sound Quality
  • Responsive

Cons

    Best Uses

    • Amateur Recording
    • Events
    • Home Studio
    • Performances
    • Professional Recording

    Comments about MXR M-133 Micro Amp Pedal:

    The M-133 is a teriffic gain boost pedal. I've been using mine for years and have had no problems with it. On stage I use it behind my multi-effects processor and it gives me a great boost for lead work or for those riffs that really need to stand out. I also use it when recording to change my gain on the fly. We hired a new guitarist last year that swaps leads with me and I have him using an M-133 now! You could complain about the price but the fact is there's nothing cheaper that works as well and after all isn't it all about the sound? Do you go cheap when you buy your other pedals also or do you buy what you know works? Well this one works great and it's easy to use, you can even change the output with your foot while you're playing just by turning the one knob.

    (3 of 3 customers found this review helpful)

     
    5.0

    Essential for leads on a great amp

    By Turbo Sparks

    from Tempe, AZ

    See all my reviews

    Comments about MXR M-133 Micro Amp Pedal:

    If you're like me, you have invested a lot of time, money, and energy into an amplifier that sounds perfect to you without needing any pedals. For me, that was the Marshall Vintage Modern 2466 100-watt head with an Avatar custom G412 cabinet loaded with 2 Celestion Vintage 30's and 2 G12H30's. I love the organic sound of the amp so much that I am extremely hesitant to put any extra interference between my guitar (Gibson Les Paul Double Cutaway) and the amp. This pedal is the only pedal I have heard that pushes your amp's tubes to add slightly more gain, and adding some extra decibels for solos, while preserving every aspect of your tone (even while it is bypassed). A lot of people like to use overdrive pedals to achieve the "boost" effect, like the Fulltone OCD. I actually used to use an Analogman TS-808/brown modded pedal on an older, solid-state amp. I now see this as useful only if you are not completely happy with your amp's natural tones. The MXR Micro-Amp is simply like having the "master volume" level shoot up a few notches on your amp by stomping on it, which I use for solos to push my sound out from the rhythm guitar. So, if you are using a solid state or hybrid amp, try using a OCD or TS-9 which emulate an overdriven tube amp...or just use the micro-amp if you actually have an overdriven tube amp!

    (3 of 5 customers found this review helpful)

     
    4.0

    solid

    By fisty mcbuttpunch

    from murica

    See all my reviews

    Comments about MXR M-133 Micro Amp Pedal:

    great pedal, simple, clean boost. had some problems running it in-lone with my pedals. it wouldnt boost my overdrive channel, only my clean.(i had it in the beginning of the chain)i then ran it through the effects loop and it works fine now. From my understanding I have an unorthodox setup, from what they said at the music store. i dont know, but once i ran everything though the loop Ive had no problems. MXR rocks!

    (2 of 4 customers found this review helpful)

     
    5.0

    Good Boost Pedal

    By Himmy Jendrix

    from Belly of the Beast San Francisco

    About Me Experienced

    See all my reviews

    Ask me a question

    Pros

    • Does not color sound
    • Solid Design

    Cons

      Best Uses

      • Performances

      Comments about MXR M-133 Micro Amp Pedal:

      Simple design that does exactly what it's supposed to do. Does not change your sound one bit. It acts just like a volume pedal in that it just raises the volume with no distortion at all. Perfect for making your lead stand out. Very solid. Not too big. Nice pedal.

      (2 of 2 customers found this review helpful)

       
      5.0

      CLEAN boost

      By toomanyguitars

      from Long Island, NY

      About Me Experienced

      See all my reviews

      Ask me a question

      Pros

      • Compact Design
      • Excellent Sound Quality
      • Responsive

      Cons

        Best Uses

        • Events
        • Home Studio
        • Performances
        • Professional Recording

        Comments about MXR M-133 Micro Amp Pedal:

        This little pedal is great if you want a clean boost.If your already running a gain pedal and you want a "boost" for your upcoming guitar solo that won't send your guitar into feedback-this is the ticket.This pedal works best at the end of your signal chain right before your delay pedal.A simple one knob circuit yes-but it works.

        (2 of 2 customers found this review helpful)

         
        5.0

        great boost pedal

        By AR Customs Guitars

        from Emmaus, PA

        About Me Professional Musician

        Pros

        • Compact Design
        • Excellent Sound Quality
        • Great Boost
        • Responsive
        • Versatile

        Cons

          Best Uses

          • Events
          • Home Studio
          • Performances
          • Professional Recording

          Comments about MXR M-133 Micro Amp Pedal:

          This pedal is great. It has been a main stay on my pedal board for about 4 years now. It has gone up and down the east coast doing festivals all over. I have had no problems at all with it. It holds up. It doesn't color your tone. you step on it and there is a nice amount of gain to saturate the sound but not too much and then it gives it that extra line level boost. This pedal is amazing! I would highly recommend this to any player weather they be a giging or non giging musician. I have also used this as a boost for solos when using my acoustic.

          (2 of 2 customers found this review helpful)

           
          4.0

          Does What it is Supposed To

          By Mike

          from NJ

          About Me Experienced

          See all my reviews

          Pros

          • Transparent sound
          • Well Built

          Cons

          • Price Is A Little Steep

          Best Uses

            Comments about MXR M-133 Micro Amp Pedal:

            This is a neat little pedal to give you a volume boost when required. The dial allows you to establish the added gain, and the foot switch kicks it on and off. It is fairly well built, and it does what it's supposed to - i.e., adds volume. The pedal is realtively transparent soundwise, in other words you get volume gain without getting anything else. My only complaint is that [$] is a little steep for what it does. I would have given it 5 stars if the price were below $50.

            (2 of 2 customers found this review helpful)

             
            5.0

            Awesome pedeal you never knew you needed

            By smartaleck

            from NYC

            Comments about MXR M-133 Micro Amp Pedal:

            Simple but brilliant. Boosts your volume and on tube amp gives just a hint of gain by driving the tubes a bit. Does something great to the tone. Very subtle but it's there. Until you have one you never realize how great it is to be able to just kick in a little extra boost to what you're playing when you need it. Is great to be able to boost or lower your volume during a set. Gives an instant A/B volume level that you can just touch when you need. Really great. Buy it.Built like a tank. Bought mine used about three years ago and it's been perfect (knock on wood).

            (2 of 2 customers found this review helpful)

             
            5.0

            Does what it should.

            By Yomama-AAT3V

            from Cleveland

            See all my reviews

            Comments about MXR M-133 Micro Amp Pedal:

            This little box does exactly what it should. It is a clean boost, and that's it. I think something this simple ought to be a whole lot cheaper, but it's built like a tank, and does not color your tone AT ALL, so I'm happy with what I paid for it. If you are looking for overdrive or distortion look elsewhere, if you are looking for a clean and totally transparent boost, this is your ticket to happiness. I love it. It will, at maximum settings, overdrive the front end of your tube amp, but it positively excels as a solo boost. I'm telling you, the only difference you'll hear when you turn it on, is that your guitar gets louder. The tonal transparency is fantastic.

            (2 of 3 customers found this review helpful)

             
            5.0

            Perfect for driving those tubes!!!

            By Anonymous

            from Undisclosed

            Comments about MXR M-133 Micro Amp Pedal:

            I will start out by saying; this pedal seems to be designed mainly for tube amps, not solid state or hybrid. I'd look else where if you want a simple volume boost for leads or something.Even though this pedal is very simple, It has some versatility to it. Let's say you have a tube amp, clean, at the volume you want it, then you turn it down, and turn on this pedal to compensate, you will drive your preamps more, which then drive the whole amp, and gets yeah the tube break up, instead of adding completely clean volume to the whole amp. You can turn up your amp and the pedal down and vice versa for more or less sensitivity, which is where the versatility lies, but I found that if you have your amp down low and try to get this to push your amp a lot, there's a decay of tone there and that's when you should just turn up your amp.More good features this pedal has are true bypass so it doesn't add color to your tone when off or on for that matter. It adds dynamics and sensitivity to a tube amp extremely beautifully with zero color to your tone.I hooked this up to a Laney tube amp I got used. Without the pedal, the amp sounded great when I tried it on a cab which I could drive the amp at 4 ohms, but when I bought it and hooked it up to my cab which can only go to 8 ohms, I couldn't hear the same tube breakup as before. Some but not enough to satisfy my thirst for that beautiful, steamy tube sustain. I bought this pedal hoping it could drive my amp enough to achieve the sound I want until I get new speakers wired at 4 ohms. This thing did so much more to my rig than I ever thought. The tone I was going for was a Marshall Tube sound, but with more glassy tube sound on the coiled string, like with Fender tube amps, but not so dominate. This pedal was my ticket to that tone. I am beyond satisfied.

            (2 of 2 customers found this review helpful)

             
            5.0

            Does a good job!

            By Stephen-gUNaB

            from IL

            Comments about MXR M-133 Micro Amp Pedal:

            I put this in front of my Marshall 1974x when I need to run the amp at lower volumes, but need some breakup. Highly recommend for those that don't have a master volume control or gain control on their amp.

            (1 of 2 customers found this review helpful)

             
            5.0

            Essential and Versatile

            By aaron

            from Cleveland, Ohio

            About Me Professional Musician

            See all my reviews

            Ask me a question

            Pros

            • Compact Design
            • Good Selection Of Effects
            • Versatile

            Cons

              Best Uses

                Comments about MXR M-133 Micro Amp Pedal:

                I've had an MXR Micro Amp for 13 years now. Pedal has never failed and it is definitely essential to my board after having used it for so long. I use it last in my chain right before the amp to boost signal loss when running through eight other pedals...use it for volume control live if people are saying I need to turn up in the middle of a song...and use it when playing acoustic to eliminate feedback. Also use it for switching guitars as some are hotter than others and I need to adjust. Adds extra gain and volume without coloring. This pedal has so many uses and applications depending where you place it. If you want extra gain and need instant volume access get one, you'll be glad you did.

                (1 of 1 customers found this review helpful)

                 
                5.0

                Great For Acoustic Guitar Too!

                By takaman

                from Wilmington, NC

                About Me Professional Musician

                See all my reviews

                Ask me a question

                Pros

                • Excellent Sound Quality
                • Responsive

                Cons

                  Best Uses

                    Comments about MXR M-133 Micro Amp Pedal:

                    I play acoustic guitar/sing solo. I use a looper so when it's time to take a lead, this little device kicks in its clean boost to make my licks shine over my rhythm pattern. Works great, good quality, sound so nice, keeps my acoustic tone clean, just louder. I've had it about a year, no problems. I suggest you get one!

                    (1 of 1 customers found this review helpful)

                     
                    5.0

                    nice & simple

                    By Chalie

                    from Aquashicola PA

                    About Me Experienced

                    See all my reviews

                    Ask me a question

                    Verified Buyer

                    Pros

                    • Compact
                    • Compact Design
                    • Excellent Sound Quality
                    • Responsive

                    Cons

                    • None

                    Best Uses

                    • Performances
                    • Powerful

                    Comments about MXR M-133 Micro Amp Pedal:

                    I'm actually using this for an upright bass. The signal isn't strong enough without it. It gives a nice clean sound.

                    (1 of 1 customers found this review helpful)

                     
                    5.0

                    Good, transparent boost

                    By BlueTuxedoStrat

                    from Lexington, SC

                    About Me Experienced

                    See all my reviews

                    Pros

                    • Compact Design
                    • Excellent Sound Quality
                    • Responsive

                    Cons

                      Best Uses

                      • Amateur Recording
                      • Events
                      • Home Studio
                      • Performances
                      • Professional Recording

                      Comments about MXR M-133 Micro Amp Pedal:

                      This pedal does exactly what it's advertised to do. Unity gain with the control all the way down; tons of boost with it all the way up. Great for pushing the front end of a tube amp. It can do everything from a good clean jump in volume for leads to full-out overdriving the front end of your amp. No effect on my tone, just more volume. Compared to other boosts out there, it's a great effect at a great price. Highly recommended!

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