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MXR

collapse expand iconDescription

The MXR M66S Classic Overdrive guitar effects pedal adds a touch of grit and gain to your guitar's signal without compromising its inherent tone. With independent output and gain controls, you can dial in the perfect amount of overdrive and tailor the volume to suit any playing situation. A simple footswitch lets you toggle between the effect and bypassing it with ease.

Output and Gain Controls Provide Ultimate Versatility

The M66S gives you total control over your overdrive tone with independent output and gain knobs. Increase the gain to push your amp into creamy, harmonically rich overdrive or keep it subtle for a touch of grit. Then adjust the output to balance the volume for any playing environment, from a small club gig to an arena show. With this level of versatility, you can achieve any overdrive tone you want.

Simple Bypass Lets Your Natural Tone Shine Through

A no-nonsense footswitch provides an easy way to engage and disengage the overdrive effect. When bypassed, your guitar's signal passes directly through unaffected, allowing its natural tone to ring out clear and true. Activate the overdrive for a classic, tube-like crunch or to push a distorted amp channel into singing sustain. A quick tap of the footswitch is all it takes to return to your guitar's pure tone.

Indestructible Housing Protects Your Tone

Housed in an indestructible die-cast enclosure, the M66S is built-to-withstand years of performance use without impacting your tone. Its rugged construction shields the pedal's circuitry from damage so you can achieve the same great overdrive sound night after night. Power it with a 9V battery for convenience or a Dunlop AC adapter (both sold separately) for consistency.

MXR M66S Classic Overdrive Guitar Effects Pedal
MXR M66S Classic Overdrive Guitar Effects Pedal
MXR M66S Classic Overdrive Guitar Effects Pedal

collapse expand iconFeatures

  • Output and gain controls for ultimate control at any volume
  • Simple footswitch toggles effect on or bypass

collapse expand iconWarranty

All pedals - one year parts and labor warranty.

Featured Articles

collapse expand iconReviews

4.39

38 Reviews

91%

of respondents would recommend this to a friend

First Impressions
Great Tubescreamer or SD-1 Replacement
Really good OD

Most Liked Positive Review

5

Excellent as a drive or clean boost with 2 modes

This is an excellent overdrive. I was really looking at a Maxon 808 and a few other popular overdrives to use as a clean boost (0 gain, max output volume, feeding the distorted channel of a tube amp) for metal playing to tighten up the sound. This pedal works perfect for that. Unlike a lot of OD I've tried it retains the low end and the tone of the guitar/amp and just tightens up the flab, makes the sound crisp, and really gives bite and sustain. Google and you will find it has a hidden switch on the board inside to change from the MXR GT-OD sound to a Zakk Wylde Signature Overdrive sound. Both sound excellent but one offers more volume and bass frequencies on my Marshall DSL401 (feeding a 4x12 Bugera cabinet). I drilled a hole in the cover of the pedal so I can flip the switch with a screwdriver. This pedal has 0 signal noise and when it's off it sounds exactly like there is no pedal in the chain at all so the bypass is extremely good unlike other pedals I've tried. On the clean channel it works well as a clean boost but if you dial up the gain it gives a very warm and bluesy overdrive tone that fills the gap well between my clean and OD1 channel. On the low gain overdrive channel it gives a nice crispness and bite and boosts sustain and attack for better hammer ons and pull offs without adding more distortion/gain to the sound. On the high gain overdrive channel it just cleans everything up and takes the muddiness out, especially in Drop D or Drop C tunings. Used these are the best value on the market for an overdrive.

VS

Most Liked Negative Review

1

Waste of money

I first bought this pedal just to have and when I first plugged it in, it didn't work at all so I went to return it and got a new one. It worked for a week and it just didn't give me any sound but the light turned on but no Audio.

Filters
Best Uses
  1. Performances26
  2. Home Studio17
  3. Amateur Recording11
  4. Professional Recording9
  5. Outdoor Events / Games6
Cons
  1. Limited Selection Of Effects2
  2. Not Responsive2
  3. Difficult To Use1
  4. Not Durable1
  5. Poor Sound Quality1
Describe Yourself
  1. Experienced23
  2. Novice6
  3. Professional Musician6
  4. Child1
Pros
  1. Excellent Sound Quality30
  2. Responsive23
  3. Compact16
  4. Versatile10
  5. Good Selection Of Effects6

Reviewed by 38 customers

  • I didn't love it.

    3

    submitted5 days ago

    byNoah

    fromEnon, OH

    I tried this pedal through a Fender Deluxe and it sounded muddy and lifeless.

  • Tube Screamer type sound. Well built.

    5

    submitted2 months ago

    byKevin

    fromBellingham, WA

    Great design. Simple but effective layout. Can be used to help dial in those SRV tones. Great for dialing out those spiky treble overtones that some amplifier sometimes exhibit.

  • Recommended purchase!

    5

    Verified BuyerVerified Buyer

    submitted8 months ago

    byJeff

    fromBuffalo, NY

    Submitted as part of a sweepstakes

    This pedal is a lot of fun to use. Great classic tones.

  • total junk

    1

    submitted8 months ago

    bykevin

    fromminnesota

    this thing is totally horrible. It either muds everything out or just make your amp squeal, cause a total waste of time effort and money.

  • Nice vintage overdrive

    4

    Verified BuyerVerified Buyer

    submitteda year ago

    byWilliam

    fromPittsburgh

    Submitted as part of a sweepstakes

    Light tube screamer sound. I use it on bass and it holds.

  • Great od pedal

    5

    Verified BuyerVerified Buyer

    submitteda year ago

    byTim

    fromPhiladelphia, PA

    Submitted as part of a sweepstakes

    Great pedal. Has a switch inside that can make it a wylde overdrive if you're willing to take it apart and like that particular sound. Great price as well.

collapse expand iconQ&A

Have a question about this product? Our expert Gear Advisers have the answers.

  • submitted4 years ago

    asked bySean

    fromUtah

    Is the pedal true bypass or buffered?

    Is the pedal true bypass or buffered?

    Open Reply - Thomas
    It's a true bypass.

  • submitted5 years ago

    asked byG$

    fromColorado Springs

    Is this the version with the internal switch that has the same circuitry as the Wylde OD pedal?

    Is this the version with the internal switch that has the same circuitry as the Wylde OD pedal?

    Open Reply - Ronald
    It is not.