Q-Tron

Envelope Filter
Improve your Groove. The phattest, funkiest envelope filter ever made! Switchable Boost and Filter modes allow for an unlimited supply of new auto-wah effects that drip with attitude. Increased frequency response and improved signal-to-noise ratio make the Q-Tron perfect for use with any instrument. Bootsy Collins and George Clinton already have theirs. How about you?

Featured Videos
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From the Blog
Posted 8/14/2013


Marta Altesa uses the EHX Q-Tron to add funk to Jamiroquia’s “Little L”


Posted 1/23/2012



Rubenfunkster unleashes the funk with his EHX Q-Tron Envelope Filter.

Posted 10/3/2011



Garret Schmittling layers up a real tasty groove using an assortment of EHX effects pedals to cover Daft Punk’s “Something About Us.”

Posted 7/15/2011



Victorcolmenero2008 and the EHX Q-Tron on bass… oh yeah!

Posted 6/18/2009
Can you crack the code of Riddle & Enigma?

First clue: Mike Beigel landing EHX color in the remote ice fields of Cape Crozier, Antarctica.

Years earlier, back in 1972, Mike also explored new sonic landscapes as inventor/engineer of the world's first stand-alone envelope filter, the Mu-Tron III. The sound was quickly captured by Stevie Wonder, and made famous by his 1973 funk classic, "Higher Ground."

Here's a vintage 1973 performance:

Despite Stevie's personal endorsement (see right) and other noteworthy users like Bootsy Collins and Jerry Garcia, the maker of the Mu-Tron III (Musitronics) closed shop in 1978. Years later, Mike Beigel decided to bring the original Mu-Tron III mojo over to EHX. Mike picks up the story:

"In '94 I met [EHX founder] Mike Matthews at a NAMM show. We talked about effects pedals, and later he asked me if I'd be interested in re-creating the Mu-Tron III for Electro-Harmonix. The new box which is called the Q-Tron, uses the same opto-electronic design of the Mu-Tron III, with new features and improved specs."

Mike and Mike went on to design the EHX Q-Tron, Q-Tron Plus, Micro Q-Tron, Stereo Polyphase, Bi-Filter -- and now, Riddle & Enigma: mysteriously musical envelope filters for guitar and bass.

What about Antarctica? In that same year (1994) Mike Beigel was also hired to design and build a system to track penguins between their nests on the beaches of Antarctica and their aquatic feeding territories. Mike later traveled to Antarctica to install and troubleshoot his system, and remembered to pack his EHX t-shirt. Mike adds: "And yes, I did work on some EHX designs during my spare time in Antarctica!"

While there, Mike also managed to capture amazing photos of the locals:

Riddle & Enigma: welcome to the family.

Submissions to EHX.com
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Quick Specs
True bypass
Selectable low pass, band pass and high pass filters
Resonant peak control to adjust the filter's Q from subtle to dramatic
Hi and lo frequency response modes
Adjustable gain knob and boost switch
Sweep direction switch for up or down filter sweeps
Tough and compact die-cast chassis
24DC-100 power supply included
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