Our recreation of the original vintage EHX Poly Chorus, in a super small pedal board friendly package.

This multi all analog effect can produce up to 5 effects, slap back delay/double tracking, chorus, vibrato, flanger, and filter matrix.

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WHAT IS IT?

Features of Poly Chorus

• True Bypass
• 18v DC operation 2.1mm Boss style negative tip jack, does not use potentially noisy surge pump / voltage inverter IC's sometimes used in 18v pedal circuits.
• Uses 2 x vintage Panasonic BBD's.
• Attractively priced. Vintage units, if you can find one for sale, are being sold for thousands!
• Blend control instead of a switch. Allows user more control. When in Chorus mode, a Vibrato effect can be achieved by turning the Blend control fully counter clockwise.
• LED Mode indicator - LFO flashing for chorus/flanger, static for Slapback and Matrix settings
• New Input filter switch 
• New internal threshold trimpot .The threshold control introduces a rudimentary gating control at low levels which can help prevent noise the circuit is prone to generate particularly during silent passages. This can be adjusted to taste, however it is calibrated by default in an "Off" setting (FCW). The pedals noise and quirks are at their most noticeable when in flange mode with width rate and feedback at maximum settings. 
• The PastFx Poly Chorus is not  based on the EHX Poly Chorus reissues, as the original versions were always mono + dry output.(Due to space restrictions we have omitted the DRY out.) The Poly Chorus reissues used a psuedo stereo reversed phase output.
• Our circuit is not  a recreation of a DIY pcb project. We are in possession of original vintage units including Poly Chorus, Poly Flange & Echoflanger.These units do vary due to age, however they have been a key reference in the PastFx's design.
• Please note: Our Poly Chorus is based on the original 1980's EHX Poly Chorus circuit. This effect was also sold as the Poly Flange & Echoflanger. The Poly Chorus was reissued twice starting in the 1990's with a "stereo" big box version then several years later a smaller version. These versions use a different circuit compared to the vintage units.
• We have incorporated a couple of adjustable internal mods to improve on the noise issues found in the original and its adaption to the Panasonic BBDs.
• Incorporates an internal volume trim pot to rectify the famous volume drop found on many a EHX vintage pedal.
• 1590B enclosure size (the smallest recreation of the original circuit that we know of)
• Current draw 80 mA. Only high quality audio style power supplies to be used. (eg Cioks dc7 and equivilent) Aliexpress/Amazon budget supplies will cause performance issues. Some users have had issue with Strymon power supplies, currently the Dunlop ECB004 18VDC supplies appear to be the most economical supply that has had general positive feedback. CIOKS DC Range is strongly recommended! We do not recommend MXR Bricks.
• Please note: The original and the PastFx versions of the Poly Chorus are not void of their quirks. Due to the limitations and complexity of the circuit the Poly Chorus can exhibit chirps, lfo ticks and other sounds which may to some be interpreted as a fault. This is the nature of the beast of this circuit. We have included some adjustable mods to mitigate these behaviours. We could have changed the circuit to eliminate the quirks however the pedal would no longer be faithful to the original and would lose some of its magic.
• One of the unusual aspects of the Poly Chorus is that it has access to a feedback control while in Chorus mode. Generally speaking most chorus pedals do not incorporate a feedback control. Kurt Cobain famously made use of feedback in chorus mode in Nirvana's In Utero song "Radio Friendly Unit Shifter" This is why the Poly Chorus has been so sought after for those wishing to replicate these sounds

Suggested settings

Big Thanks to Scruffie for his assistance in this project.

Without his input, this pedal would not had come into fruition :)