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Read Other Installments in the MXR 40TH ANNIVERSARY Blog Series:

The Rackmount Era  |  The MXR Infographic



Build a better mousetrap and the world will beat a path to your door. For guitarists, that better mousetrap arrived in the early ’70s when Keith Barr gave the world the MXR Phase 90. It was the first of many brightly colored effects pedals that would find their way onto stages and into recording studios worldwide.


Barr and his partner Terry Sherwood owned an audio repair shop in Rochester, New York, where they were shocked by the poor quality of the guitar effects their customers brought in. Barr and Sherwood decided they could give guitar players a better sounding, cooler looking, and more reliable stompbox. MXR was born, and the company gave guitarists access to amazing sounds—some of which were previously available only in high-end studios—delivering those sounds in rugged, roadworthy enclosures.


The response was immediate and overwhelming. Starting with a few dozen Phase 90s constructed in a basement and sold out of a car at gigs, MXR added three more pedals to the core lineup: the Distortion +, the Dyna Comp® Compressor, and the Blue Box ™ Octave Fuzz. Soon, the growing company was cranking out thousands and thousands of stompboxes and distributing them all over the planet. Guitarists everywhere were plugging into MXR pedals, and those chains of multi-colored boxes became synonymous with out-of-this-world sounds and limitless possibilities.


The long list of timeless recordings that feature MXR pedals includes classic tunes by such giants as Led Zeppelin, Van Halen, the Rolling Stones, and many, many others. The vicious distortion on Blizzard of Ozz? MXR Distortion +. Jimmy Page’s “Fool in the Rain” solo? MXR Blue Box. Virtually every song on Van Halen I? Phase 90. Keith Richards’ trippy tone on “Shattered”? Phase 100. The intuitive operation and bullet-proof reliability of MXR pedals ensured that those guitar heroes could reproduce the sounds of their hit records night after night on the road as well as in the recording studio.


The music business can be fickle, however, and MXR’s fortunes would shift in the ’80s as other manufacturers began to catch up. MXR closed its doors, but the core products never fell out of favor. Jim Dunlop recognized this, and acquired and resurrected the MXR brand. Fittingly, Dunlop’s first MXR releases were the Phase 90, the Distortion +, the Dyna Comp Compressor, and the Blue Box Octave Fuzz. Dunlop’s acquisition meant that guitarists could once again get their hands on the classic MXR effects, and it also represented a continuation of Keith Barr’s innovative legacy with the eventual release of many new designs.


Pedals such as the Carbon Copy® Analog Delay, Custom Badass ’78 Distortion, and Smart Gate® Noise Gate have become modern classics. The Bass Innovations line offers bass players pedals designed with their very specific needs in mind, and the MXR Custom Shop serves as a testing ground for the MXR team’s most ambitious and adventurous ideas.


What’s more, the MXR roster now includes classic non-MXR effects such as the Talk Box and the Uni-Vibe Chorus/Vibrato—recreated with dead-on accuracy and imbued with all the qualities that made MXR famous—in addition to several signature effects developed in conjunction with guitar players such as Eddie Van Halen, Slash, Zakk Wylde, and Dimebag Darrell.


The 40th anniversary of MXR’s incorporation finds the company more vibrant and exciting than ever, offering dozens of models for guitar players and bass players, with the time-honored effects that got the company started sitting proudly alongside forward-thinking boxes never dreamed of by the founders.


The fact that we can’t remember a time when there weren’t hundreds of stompboxes to choose from is due in large part to MXR. The company’s first print ad, which appeared on the back cover of Rolling Stone and featured the then-unheard-of Phase 90, stated simply, “MXR: We Are Here.” Those words are far truer on the 40th anniversary than they were when they were written. The next 40 years will only bring more incredible sounds in neat little boxes to innovative musicians everywhere as the company that created such a big part of the soundtrack of our past provides the tools to take music into the future. Prepare to be amazed all over again.


This year, we’re celebrating MXR’s 40 years of innovation with a series of mini documentary videos covering its history—from being sold out of a suitcase to appearing on the world’s biggest stages—along with numerous artists, engineers, pedal designers, and original MXR personnel telling stories of sonic inspiration and discovery. Start below with the trailer for just a small sample of what’s to come; then watch our inspiring interview with MXR founding employee Ron Wilkerson, who explains the creative, business and technical enthusiasm that drove MXR’s formative years; and then watch as guitar hero Paul Gilbert recounts his first experiences with MXR effects, and explains how the right effects can influence experimentation and inspiration. Stay tuned for more MXR mini documentaries throughout 2014…







Comments (23)

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Category: MXR

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  • Mark Pilipczuk

    As a fellow Upstate NY boy, I’m also proud that MXR came out of our part of the world. I’ve got a script Phase 90 reissue and love the fact that it’s one knob and–BOOM–it takes you back to the golden years of tone without fussing around. I reckon it will last me forever.

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  • Steve W.

    I wish I had all my MXR gear still. Had to sell it all after I got married and had kids *sigh*. I had… Dyna Comp (script), Micro Amp, Noise Gate / Line Driver, Flanger, Analog Delay, and 31 band Graphic EQ.
    Love me some MXR…

  • Greg Adams

    I still have my MXR Phase 90, that does NOT have the LED light in it. It still works great and is just as solid as the day I bought it.

  • Congrats on 40 years! A Phase 90 was the first pedal I ever bought, second-hand from a friend in high school in the late ’70s. I figured out how to add a resonance control and other stuff, mounted it in a rack in the ’80s, put it in a new pedal enclosure later, and it’s on my pedal board to this day. MXR’s simplicity and durability are fundamental principals at the core of my own work. Thank you for the inspiration. -Bruce Clement, BC Audio

  • I can’t do a gig without my trusty and trusted Micro Amp. Mostly fo rsolo boost, but it adds a little something special to songs where I use a clean tone. Happy 40th!!

  • Mitch Ravitz

    Why is my Dunlop/MXR advertising coming with other advertising? Just because I want to see Dunlop’s info does not give Dunlop or anyone permission to provide other advertising. If you can’t live with that then take me off your mailing lists.

    • Jerry

      Unsubscribe genius.

  • Scottymacg5

    Of all the “boutique” pedals available today, and all the pedals I own, I have to say my MXR Envelope filter still stands as one of the warmest “creamiest” sounding pedals around. I once sold it at a premium, and for the first time experienced sellers remorse, could not rest until I found another. Thank god for Ebay.

  • pooch

    I wish I would have purchased a MXR Distortion pedal because I would still have my Pre CBS Bandmaster head and cabinet.

  • Sherman w

    I still have my original distortion plus with the cursive writing problem is a battery leaked in it and I have not tested it since I also have a distortion 2 it has 4 different knobs and plugs in instead of a battery it is in mint condition I have never seen another and was wondering if it might be a rare collectable I used to have the original phase 90. And phase 100 also had a flanger and a blue box loved them all

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  • Ross

    they seriously need to reissue a script version of the Phase 100. please Jimmy Dunlop, do this now! the people will love it!

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  • Rose Marie Sherwood

    As the wife of Terry Sherwood, I want to thank you for celebrating the legacy of both Keith Barr and Terry. MXR started in the basement of the first house that we lived in. It out grew the basement production rapidly. The business moved to Goodman Street, into an old brick building that was large enough to accommodate all the people who had been hired and all the departments of running the business. That building just recently was being renovated and unfortunately suffered a major fire which will, most likely result in its complete demolition. Keith was the engineering genius behind MXR but there were many people, including Terry who harnessed him towards developing the business. At times the “harnessing” was a job in and of itself.

    Terry passed away in June 2013. He had fought a battle for many years against non-Hodgkin’s lymphoma. I documented his journey on Instagram (username rmsherwood).

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