Korg Polysix

“In GOOD condition. It should be noted that there is a small chip located on the left wood-panel.
I provided a close-up picture.

This model is in it’s original condition, with original battery and no aftermarket add-ons.

All functions work as normal.

It comes with a copy of the operator’s manual and factory preset tape.” Click here to visit listing on eBay

Korg Polysix

“It works. Turns on. Buttons work. Some of the keys are not working. Also it creates a distorted sound when playing. Something is wrong with it. Not sure what. Just put a new battery in it and cleaned out the keys. Volume knob is a bit wonky. This is a bit of a fixer upper. Korg Polysix Keyboard Synthesizer. Condition is “Used”.” Click here to visit listing on eBay

Korg Polysix

“This is a used unit.

This Polysix has just come from a service. This included a power-supply refurbishment. This vintage beast is sounding great and a pleasure to play.

A new memory battery has been installed and factory patches have been loaded in for the new owner.

This Polysix is in good condition. It shows some wear on the faceplate, mostly along the top edge, as well as some cracks and nicks in the veneer. There is some surface oxidisation on the back of the unit. There is nothing major and nothing which detracts from the use, functions or sound of the synth. Please see photos for more details.” Click here to visit listing on eBay

Korg Polysix

” Amazingly cool Korg PolySix analog synth in GREAT condition in and out. I just had the internal battery replaced so its good to go for years. Sweet pads, strings, brass, basses and so much more. Very distinct sound that no other synth can do. Please look at all pics.. its in amazing condition but there is a chunk of the left lower side panel missing… happened years ago on a studio move. Speaking of which, its never been gigged live, studio use only. ALL knobs, keys, jacks, buttons work properly. ” Click here to visit listing on eBay

Korg Polysix

“• Used – v.g.c for the age

• Battery have been changed & new socket

• New set of tactile switches

• Pots clean all potentiometers and relubricate + bender pots

• Power supply recapped

• Fully calibrated & cleaned keyboard & inside

• Tested, all original voices in fully working order ”
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Korg Polysix

“LEGENDARY synthesizer! The built-in effects are amazing – the Ensemble setting allows for a beautifully chilly string sound and there are some warm analogue brass sounds in there too. The Unison button turns the synth into a searing monosynth by combing all 6 voices on one note.
There are a couple of mods you can do to make it even better – check out Kiwisix or Tubbutec’s Polysex/Modysix.

Cosmetic damage: there is some cosmetic damage to the wood panels. There are a few scratches on the panel incluuding a large one over the sub-oscillator label (does not affect functionality in any way). There is a bit of gaffa residue.

Sound-wise, it has two issues that I’m aware of that have developed since the last time it was serviced (by well-known synth technician Simon Flinn). Firstly, when I leave it on for a long time, occasionally the knobs suddenly refuse to control the synth – the sound goes haywire and the knobs no longer change the sound. In the past, turning it off and leaving it for a while has fixed it. Sometimes opening it up and checking all the internal cables are fastened well has helped, too. Secondly, one of the 6 oscillators seems a bit out of tune in the lower registers.

Finally, a couple of the rubber buttons are a little sticky.”
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Korg Polysix

“Nice cosmetic shape overall, a few light marks nothing major, but had the common battery leak issue when I got it. Mostly works now after some repairs done, but has some issues still left that will need repair, listed in detail below what all works and what doesnt to the best of my ability, tho I am no expert on these. The batt board was cleaned up and traces repaired and 4 chips replaced, which fixed many of the common issues from the battery leak, but a few problems remain. I do not know if any remaining problems are due to more probs on the battery board or something else, so it may need a new klm367a batt board, or maybe not, might be a prob on a different board or something…or all the above, dont know not an expert. A new battery was not installed, so there is no patch program memory, just random patches still in it. You can get a new klm367 board for about $200ish from a nice german seller synthronics.de who I think sells them on ebay and said it would take about 3-5 days via express shipping to usa, if you cant find the link ask me. I was thinking of getting one from him but just dont have the time anymore, and figured maybe an expert on these would be able to fix the remaining probs without needing a new 367 board. So this is sold as is, partially working, for repair, no returns.

Here is the list of what works and what doesnt, to the best of my abilities:


all keys work perfect, just cleaned too
all 6 oscillators including the sub osc settings
the VCO section 3 waves for saw, pw, pwm, speed
sub osc settings
tuning knob
volume knob and output settings
the mod and bend wheels
all effects in the effects section
keyboard tracking
the arpeggiator
the key modes (poly, unison, chord, hold)
All the audio outputs and jacks
All buttons and switches for banks and program #’s
(a couple of the program # buttons you have to press a little hard but all work) ” Click here to visit listing on eBay

Korg Polysix Project Machine

“Korg Polysix. Condition is “Used”.in fair Condition.
Lights up but cannot test further.
Could use a real good professional cleaning.
Missing screws and buttons covers.
Please refer to pictures for details and flaws. Sold as is Due to volume return not accepted until buyer pays both way shipping.
Sold as is for repairs or parts.” Click here to visit listing on eBay

Korg Polysix

“Korg Poly 6 Synthesizer. Bought new in 1985. This synth powers up but there is no sound. It has been unplayed and in storage for years now. I replaced 2 keys recently, 1 black, 1 white. In its day it had fair usage (mainly home) but was well looked after, though it picked up a few knocks along the way. It comes with original manual, settings charts and sounds tape. It has a few bits of minor damage, some of the laminate on the frame is chipped, a mark on one of the keys and a few screws have been replaced ( see photos). I would have loved to get it working again because it had a beautiful, fat, rich 80s sound, but i don’t have the time or skills, so would be better for someone else with the know how, or to be used for spares if it can’t be repaired.” Click here to visit listing on eBay

Korg Polysix with Kiwisix Upgrades

“Hey guys!!! I am selling my MINT Korg Kiwisix, Polysix.

This keyboard is immaculate and as close to new as you will get.

I have owned it for 14 years, and serviced it myself.

It has the FULL Kiwi upgrade with BOTH the power supply AND cpu board.

All keys work, and it performs like new.

I am also including a ultra rare, spare keybed for the Polysix in case it ever needs it.

The keybed and Kiwi mods will ensure this synth lasts many more decades without a need for repair or service. ” Click here to visit listing on eBay

Korg Polysix

“Polysix in perfect working condition all functions work perfectly! Replaced battery and and restored keyboard with a lot of new parts by expert synth technician. Fixed up to near perfection!!! Here is a list of work done:
-No battery damage; Brand new CPU board put in from synthtronics.
-All front panel controls and keyboard body cleaned inside and out
-fully calibrated for excellent performance and tracking
-loaded with 4 banks of factory patches
-keyboard contacts, switches and screws have been replaced where needed
This synth was re-built to last!!” Click here to visit listing on eBay

Korg Polysix

“Everything works as specified, overhauled before shipping to have long life and to keep original sounds.
Change all electrolytic capacitors and some short life transistors, opamps and logis ICs with new ones, and keys knobs, sliders, switches and jacks cleaning before shipping.
New backup battery installed ” Click here to visit listing on eBay

Korg Polysix with Kiwisix Mod

“Kiwisix upgrade with new batter, power cord, cpu and midi in-midi out. 1981 analog goodness! Chorus, phaser and ensemble strings effects. Slight damage to wood veneer on one corner. Good playing condition. See kiwisix manual for all the cpu functions. 1000 plus editable tones, kiwisix mod sequencer mode. FYI Arpeggio latch function is modified for use as sequencer mode, in other words you have to hold your hand on the arpeggio chords the entire time, no arp hold with kiwi mod unless it’s a buried function that I have not found. ” Click here to visit listing on eBay

Korg Polysix

” Korg Polysix in perfect working condition all functions work perfectly! Replaced battery and and restored keyboard with a lot of new parts by expert synth technician. Fixed up to near perfection!!! Here is a list of work done: – thorough cleaning and repair of original CPU board, ensuring all traces and components are reliable, new battery/holder. – replaced most capacitors on FX board, CPU board, power supply – added bracket to reinforce switchboard PCB where it normally sags/warps – cleaned all pots/switches/jacks – added shielding between front panel and FX board
– full calibration on PSU, CPU board, voices, and FX board above factory spec
unnecessary detail: – PSU was wired for 100v, corrected to 120v – reglued missing laminate on front left – fixed 3 keys – repaired LED issue on switch board ” Click here to visit listing on eBay

Korg Polysix

“Korg Polysix analogue Synthesizer. Around half of the keys and most of the sliders/ knobs work and can still be used- the broken keys could probably be fixed with new plates or the keyboard could be salvaged for parts

Likely hindered due to dust and might work fully with a bit of a circuit cleaning.”
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Korg Polysix

” Up for your consideration is a Korg Polysix in working order.
I am offering local pickup ONLY for this. I am in Anaheim, CA 92805. That’s 40 minutes southeast of LA.

Cosmetically it is in pretty nice shape. (see pics)
I say working order, but it DOES HAVE TWO MINOR QUIRKS so please read carefully:

1: MG (aka LFO) has a half second delay before effecting pitch, amp or filter, even when LFO/MG delay is set to zero.
Pitch modulation works as normal if you use the mod wheel. Not sure why it does this.
2: Two keys (see last pic) are not responsive. You can take a shot at cleaning the key conatcts or replacing those key contacts. It didn’t really bug me because it was only those two keys.

Aside from those two things, it sounds and looks beautiful. I did everything I could to make this synth work great again. Just a couple months ago, The KLM-367a board was replaced with a clone (NO MORE BATTERY ACID), and my tech went over the rest of the synth and repaired some outputs, fixed some grounding issues, replaced some fuses, and did some other minor things. I always keep my receipts for repairs, but I cannot for the LIFE of me remember where I put the receipt for the work I had done on this one… so I took lots of pictures of the inside so you can see what we did. Hope that helps!
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Faux-wood sides have some dings, the right side has a couple little bites taken out of it, but it’s not too noticeable. One of the inside hinges was replaced with a screw, and one screw that holds the mod wheel in place is missing, though it is still solid. I went to the hardware store and replaced the four bottom screws that attach the metal faceplate to the synth. ” Click here to visit listing on eBay

Korg Polysix Project Machine

“This is a vintage Korg Polysix. When plugged in and connected to an amp the keyboard does make sounds and when knobs and buttons are turned/adjusted during play, the sounds appear to change as they should. Pitch wheel works. A few buttons missing as seen in photos. HOWEVER, due to the nature of this being a vintage, 50 year old electronic machine, I am defining its condition officially as PARTS ONLY so that no one who receives the machine feels burned. It’s entirely possible that this machine could have defects that are not clear to my eyes because I am not a musician. So buyer beware, you are buying an item that may not fully work as it did 50 years ago and is *NOT* eligible to be returned. If you get the thing home and it works like a top, congratulations, you just saved some money. But that is your risk to take. Machine is dusty as I did not want to clean it with synthetic cleaners and take a chance on harming it. Would likely clean up nicely. Includes original power cord and NO books or accessories.” Click here to visit listing on eBay

Korg Polysix Project Machine

“Synth is in very good condition, serviced about a year ago, no noise, battery replaced and key contacts cleaned.

One of the wooden corners is damaged as picture demonstrates, no other issues. Top panel very clean

EDIT: I have found a faulty since last testing the synth. The programmer is switching between patches randomly whilst playing. Sometimes it does it more often than not. It definitely needs a service which was what I initially was going to do.

All of the above still stands, the synth was working perfectly previously.” Click here to visit listing on eBay

Korg Polysix

“USED Vintage Korg Polysix Synthesizer. Selling as is for PARTS / REPAIR due to age, cosmetic condition and the issues I know of.

I purchased this synth in the shape its in now, about 12 years ago. I had hoped to eventually have it refurbished but ultimately just used it occasionally, as is.

Synth powers up and is playable ( and sounds great – in my opinion! )

Keys and mod wheels work.

All knobs and switches in the “playable section” work well. (OUTPUT, TUNE, BEND, VCO, VCF, VCA, ARPEGGIATOR, MG, EG, EFFECTS & KEY ASSIGN MODE)

Known issues:

Volume knob is scratchy when adjusting – totally fine while set.

The program number 4 button stays lit and doesn’t switch when pressed. You can still switch to the other programs.

I never messed with the tape functions so I cant speak to how well they work. However, the buttons do light.

The face of the synth has some marks, scratches and scuffs. The wood paneling has some scuffs, marks, scratches and chips. The area under the mod wheel has some wear marks.” Click here to visit listing on eBay

Korg Polysix with KIWISIX Upgrade

” Selling a Korg Polysix with the renowned Kiwi upgrade installed. The infamous battery leakage that is all too common with these has been taken care of via the improved and stable Kiwi CPU board housing new batteries. The Polysix is also known for its faulty power supplies that cause overvoltage to the rest of its boards. This too has been remedied with the KiwiSix power supply upgrade which uses reliable components and modern voltage regulators with built in safety systems.” Click here to visit listing on eBay

Korg Polysix


This has been fully serviced professionally with a lot of care and attention. The synth is not the best example cosmetically but is insound working condition and I’m confident it’s in considerably better working order than a lot of other polysix’s out there.

Imperfections: the output volume control is a little bit scratchy, see video. Some keys occasionally double trigger when pressed lightly.The polysix is by reputation quite a noisy synth; there is a noise floor, it is an old synth.

If you bought a car from 1980 you’d expect to pay to run and maintain it, the same applies to vintage synths. As detailed above this synth has been invested in (servicing, clone PCB, MIDI kit) so a very good deal in that respect, but I’m not selling this with any kind of long term warranty or support contract.”

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Korg Polysix Project Machine

“This Korg PolySix is for parts/needs repair. The keyboard exhibits some light wear and On/Off switch shaft for the Latch function is broken but can still be adjusted; The keyboard is cosmetically clean overall. The keyboard powers on and all parameters are working but there is a total of 9 keys that are intermittent or not passing any sound at all. Also, the badge for the MIDI Inputs/Output is missing. Selling this as is as a project synth. The keyboard mostly does work. This is a great project for a tech to get into to restore it to its full glory.” Click here to visit listing on eBay

Korg Polysix

“Korg polysix, excellent condition, everything fully working

The only cosmetic flaws are the missing veneer on 2 of the wooden end pieces (see photos)

Battery has been replaced, by a previous owner, photos of boards showing where the old battery would’ve been

uk plug

Has midi retrofitted also by a previous owner, however they are mislabelled, I don’t know which way round they go as I don’t use midi. The photo of the wiring inside should answer it.” Click here to visit listing on eBay