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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
Hand-written note with Kurt's settings for the polychorus (for Heart-Shaped Box and Radio Friendly Unit Shifter): ehx.com/blog/ehx-tone-tips-the-sound-of-nirvana
From kurtsequipment.com:
Effects:
10). Electro-Harmonix EchoFlanger (32)(40) and Electro-Harmonix PolyChorus (37)(seen 15).
Despite the different names, the Polychorus and Echoflanger had the same internal circuitry. Kurt supposedly only had one EchoFlanger, despite what is said in (32). Kurt used the EchoFlanger on the Brazil shows (source info? Rio perhaps?) and the song "The Priest They Called Him" (found on various bootlegs, etc.). Both pedals were taken on the "In Utero" tour.
The EchoFlanger sometimes "acted up" and Earnie gave Kurt his PolyChorus as a back-up. This PolyChorus was used on "In Utero" for the "Heart-Shaped Box" solo, "Radio Friendly Unit Shifter," and "Scentless Apprentice" (41). Earnie sent out another PolyChorus to Kurt, hoping to get his back, but the "new" one broke and was given to Eric Erlanderson of "Hole" who had it fixed. Earnie did eventually get his PolyChorus back, but not before Kurt marked his settings on it with nail polish and put Velcro on it.
The EchoFlanger was supposed to be used on "Unplugged" but caused too much 60-cycle hum in the control room. Courtney now has Kurt's EchoFlanger (40).
In his photo of one of Johnny's boards, a vintage Polychorus by Electro Harmonix can be seen.
In this YouTube video showing Arctic Monkeys producing their song "Opening Night" at Abbey Road Studios, Tom Rowley (bottom right) is seen at 0:29 with the Electro-Harmonix EH-7700 Polychorus.
Omar Rodríguez-López used the Electro-Harmonix EH-7700 Polychorus on early The Mars Volta pedalboards, as evidenced by a user-uploaded photo on the Guitar forum.
According to this description from the back of the 1982 promotional LP "Indisciple", Belew's rig at the time included a Polychorus unit.
In the background at 1:26 you can see the distinct shape and art of an old Polychorus
“Because of the Micro Synth, I got turned on to the whole Electro-Harmonix thing—I had the Memory Man, the PolyChorus, the PolyPhase, and we used them all the time.”
In a photograph by Takayuki Okada, Theresa Wayman is shown using the Electro-Harmonix EH-7700 Polychorus flanger effects pedal.
"I would use the Electro-Harmonix Polychorus and the Boss VB-2 vibrato pedal. Those two pedals created a tension I really liked. I like a clean tone. I don’t like to sound distorted because I feel that in the band I serve almost as a pathway between the bass and the guitar."
Visible on Fender's pedalboard at 2:15 in the music video for his song "Leave Fast." The pedal was mentioned in the 2021 Premier Guitar interview.
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Thomas posted a picture of some pedals he's using with Pushover.
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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