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Average Price: $591
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$60
$201+
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Description
Introducing the Electro-Harmonix EH-7700 Polychorus, a versatile and dynamic flanger effects pedal that has made its mark among guitarists seeking to expand their sonic landscape. Known for its unique analog design, the Polychorus goes beyond typical flanger offerings by delivering an array of lush, modulated soundscapes. This pedal is not just about flanging; it encompasses chorus, doubling, and even vibrato effects, making it a multifaceted tool for any musician's pedalboard.
With its intuitive controls, the EH-7700 allows for precise manipulation of your sound. Musicians can easily adjust the Rate, Feedback, and Depth to sculpt their desired effects, while the Mode switch enables seamless transitions between flange, chorus, and other modulations. Whether you're aiming for subtle texture or dramatic, sweeping effects, the Polychorus provides the flexibility to achieve your artistic vision.
The pedal's robust construction ensures durability, allowing it to withstand the rigors of live performances and studio sessions alike. Its True Bypass circuitry preserves your guitar's natural tone when the pedal is not engaged, maintaining clarity and integrity in your sound. The Electro-Harmonix EH-7700 Polychorus is a classic choice for those who demand both quality and versatility from their gear.
Key Features:
- Unique analog design for a wide range of modulation effects
- Modes include Flange, Chorus, Double Track, and Vibrato
- Intuitive controls for Rate, Feedback, and Depth
- True Bypass circuitry for maintaining tone integrity
- Sturdy build for reliable performance in various settings
Product specs
| Analog/Digital | analog |
| Power | 9V |
| Bypass | true bypass |
| Mono/Stereo | stereo |
Videos
ProGuitarShopDemos
Electro Harmonix Stereo Polychorus Pedal
Electro Harmonix Stereo Polychorus Pedal
ProGuitarShopDemos
EHX PolyChorus Demo - Vintage vs. New - Electro Harmonix Guitar Chorus Pedal
Carl Roa
Electro Harmonix Polychorus - sound test / possibilities - by Nomakills
nomakills
Electro-harmonix Polychorus (Flanger mode) overdrive/distortion
Guitar Pedal Demos
Electro-harmonix big box Polychorus demo CLEAN (Chorus mode)
Guitar Pedal Demos
Electro-Harmonix Polychorus - Song Demo
Winter’s stuff
electro-harmonix (EHX) Polychorus Flange mode CLEAN / IN STEREO
Guitar Pedal Demos
Electro-harmonix big box Polychorus demo overdrive (chorus mode)
Guitar Pedal Demos
Reviews
PROS
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Offers versatile effects: slapback delay, chorus, flanger, and filter matrix
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Unique, resonant, and metallic ambience not mimicked by others
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High fidelity sound thanks to 24V power supply
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Provides a distinct clean tone when used with other pedals
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Allows for slow flanger settings and deep, rich chorus effects
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Doubler setting adds depth and presence
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Durable construction, suitable for heavy gigging
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Analog circuitry for warm, organic tones
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Self-oscillation and noise possibilities for experimental sounds
CONS
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Large size may be cumbersome for some pedalboards
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Slight volume drop and signal weigh down due to buffered bypass
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Requires time to dial in sweet spots
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Some may find the flanger effect milder than expected
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True bypass modification may be desired by some users
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Electro-Harmonix EH-7700 Polychorus.
Build quality
Features and functionality
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This model uses dual Reticon SAD1024 BBDs, similar to the Electro-Harmonix EchoFlanger and Poly Chorus from the same era.
Source
4.5 out of 5
Based on 8 Reviews and 34 Ratings
10
My all time favorite effect pedal!
I'm going to start by saying, this won't be a quick review, but it will be the most accurate as far as the differences between the different versions of this pedal. Over the years, I've seen more confusion, and misinformation on this pedal, than just about any other piece of gear I've read about before. I've owned all three versions of the EHX polychorus, and I feel like I should point out that the unit in the photo here is not the vintage model. It's the big box reissue. Before reviewing the vintage model, I feel that I should point out that the vintage and reissue models, although very similar in appearance, are two completely different circuits, use different BBD's, and sound very different from each other. The easiest ways to tell the difference between vintage and reissue are that the reissue is stereo, and features an "overload" LED. The vintage model uses two SAD1024A BBD IC's, and the reissue, MN3008 and MN3009 BBD's. Also, the Echoflanger (1977-1979), Polyflange (1979-1980), and vintage Polychorus (1981-closing of EHX) are all exactly the same circuit, marketed with different names. The vintage unit features a "blend" switch rather than the "sweep filter" on the reissue. The blend switch turns off the dry portion of the signal when in the off position, for vibrato effects, but with a very slight, but noticeable reduction in volume. The "sweep filter" on the reissue sort of tames the width of the sweep, which can get very extreme, especially at longer delay times. As I mentioned before, I have owned all three versions of this pedal, but now only have my original vintage model. Double track mode features a nice short analog slapback delay, that breaks apart in typical analog fashion at higher feedback settings. Don't expect this to replace your delay pedal, even at max delay time, it's probably not much more than 100ms or so. Chorus sounds from this pedal are incredible. Very warm and organic, just how analog should be. Lots of tweakability given that many other chorus pedals don't have controls to adjust delay time, or add in any regeneration. The the width and delay controls are interactive with each other, and can make for a sweep much wider than most traditional chorus and flanger pedals. Flange mode can do anything from subtle to full on jet plane swoosh. The filter matrix mode can be useful for sweeping your frequency around manually and finding a sweet spot to cut through a mix, or at certain settings, coaxing some banjo-esque tones of out your favorite electric guitar. The reissue, while also BBD based, just wasn't as warm and natural sounding as the original to my ears. However, its maximum delay times are a bit longer than the vintage unit, and because of that, when modulated, the ups and downs of the sweep can be VERY extreme, reaching probably a good 4 to 5 steps above and below the original note played. If you're looking for some never before heard, weird avant-garde noise rock worthy sounds, the reissue might be the way to go for you. Oh, that actually reminds me, everyone trying to replicate the Radio Friendly Unit Shifter sound from Nirvana, you're going to want the vintage model (this is where that blend switch shines). While the reissue can make lots of crazy sounds, it can't make that one without the original note droning out over the modulated sound that you hear on the album.
41029
GREAT review
819
The ultimate analog noise machine!
This is a great analog multi-effect (sort of) pedal! All effects are delay based, you have Filter Matrix (which is sort of a "frozen" flanger, you can manually move it or set it on a fxed position), Flanger (a bit mild, not as pronounced as the usual suspects), Chorus (which goes from subtle to too-much-with-a-bit-of-delay) and Double Track (which is basically a short delay). It might be a bit of work to find a regular chorus sound, if that's what you're after, but it it possible. I like to use it (in Chorus mode) with both Rate and Range set at 9'o'clock, Delay and Feedback off. And the noise possibilities on this pedal are awesome. In any of the 4 modes you can go into self-oscillation by turning the feedback knob all the way up, and get weird noises by moving the other parameters around after that.
225
Great for out there sounds.
You need to really spend time with this pedal to find the sweet spots. Might be Kurt Cobain's secret weapon, but I've moved it off of my board in favor of others pedals. I still use it in the recording process on occasion.
146
Analog Blanket of Warm Squishy Chorus
This pedal has become my security blanket. Playing a solo? Flange with wide berth at a ridiculous rate. Rhythm chords? Double Track, with zero feedback. End of the show? Crank every knob to 11 and watch your audience members run out with their ears in their hands. Or set it to Filter Matrix and let it rip through the mix like a saber made of light. "I guess you guys aren't ready for that yet... But your kids are gonna love it." -Marty McFly
41029
lol
146
Btw the stock photo settings here depict how to run he effect heard here: https://youtu.be/ER5NG2i_5V4
WYSIWYG, but Double Track and Filter Matrix make this beast worth its price
Had this taped to a guitar body, then gigged hard on the floor for a few years. Very strong construction.
Well built analog chorus
With the ability to be both a chorus and a flanger, I made great use of this over the years.
158
41029
the originals are very noisey
158
Hey, thanks! I was not aware of that
another secret of my sound
this is a great great great chorus pedal... creating a strange sound i never heard before...
Artist usage
Add artist
In this photo, an Electro-Harmonix Vintage Polychorus Pedal can be seen on Bob's pedalboard.
At 06:23, Jonathan says "I've been spoiled by my Electro-Harmonix Polychorus back home. That pedal is like half the size of this pedal board and I can't bring it [on tour]."
In the YouTube video titled "Nomakills - Guitar Gear Rig (effects and more)," Nomakills is seen using the Electro-Harmonix EH-7700 Polychorus flanger pedal.
In this photo, posted to Adelaide's Facebook, one can clearly see an Electro-Harmonix Poly Chorus on Jurel Sónico's pedalboard.
In the YouTube video titled "Weakened Friends - The Fest That Never Was (Full Set)," a livestreamed performance originally aired on October 31st and November 1st, 2020, the Electro-Harmonix EH-7700 Polychorus can be clearly seen on Sonia Sturino's pedalboard.
It is a vintage 1970s unit that Sonia obtained in 2019.
Martin Miguel Tonne has used the Electro-Harmonix EH-7700 Polychorus in his setup, although he has since replaced it with other chorus effects. In an interview on Guitar Moderne, Tonne explains his current preference for creating chorus-like sounds using a Line 6 Echo Park pedal. By setting it to a short slap delay with pitch modulation, he achieves a basic chorus effect.
According to Dunning's pedalboard photo, he also used this pedal.
In the YouTube video titled "Nomakills GEAR: guitar effects pedals / FX units," Nomakills official is shown using the Electro-Harmonix EH-7700 Polychorus flanger effects pedal.
Featured in this January 6, 2013 Electro-Harmonix Blog post.
Chico Mann, a prolific afrobeat artist, turned us on to a tune he did using his guitar with its built-in EHX MicroSynth. Here it is:
“I played the Caius guitar with built-in MicroSynth plugged into a chain of all my EHX pedals.
To start, I tuned down my E-string, muted all the strings with a strip of foam so that I got a dull thump. Then I filtered the MicroSynth to get a low frequency tone as my bass drum sound. Ran the guitar through an ‘80s Fender 75 with the bass rolled up, mids a little less than half-way, and treble about one-quarter. Then played and recorded a four-on-the-floor bass drum pattern to a click track.
Next I filtered the MicroSynth to have a higher frequency cutoff for my snare sound, eq’d the amp accordingly, recorded that. Then in the same fashion made a 12-bit-like HH sound and recorded it. Mind you, I played all the ‘drum’ sounds straight through. No looping! The Big Muff Pi came in handy for these sounds too!
With the POG-2, I made some organ sounds and comped some chords. The SuperEgo and Holy Grail gave the comps an extended decay with washy ambience.
Next I made a squelchy, resonant synth bass sound ala the Roland TB-303 with the MicroSynth. The POG-2 added the octaves below for a more convincing synth bass sound.
The top-line synth parts were made the same way, basically with MicroSynth programming and EHX pedals for coloration. The detune function on the PolyChorus is also really handy at helping create the detuned oscillator vibe that I love about analog synths.
I could probably keep going about the particulars but that’s the basic gist of my process.
This was just a little demo that I recorded in a couple of hours to show what EHX pedals could do when you approach them from a little outside the box!”
Album Usage
The Electro-Harmonix EH-7700 Polychorus 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 Electro-Harmonix EH-7700 Polychorus, it is most commonly used with the following gear.
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