Korg · Analog polysynth · Pre-MIDI classics
Korg released the Polysix in 1981 at roughly a third of what a Prophet-5 or Oberheim OB-X cost, which put programmable polyphony within reach of working bands. It has six voices with one VCO and a sub-oscillator each, a 24 dB per octave low-pass filter, 32 patch memories in four banks of eight, an arpeggiator, and built-in chorus, phaser and ensemble effects. Sound On Sound heard more low-mid weight in it than in the Roland Juno it was built to compete with, and Kitaro, Geoff Downes, Keith Emerson and Tears for Fears are among its users. It had no MIDI from the factory, though Kenton, Kiwi Electronics and Tubbutec have all made retrofits. The one thing to check on any Polysix is the memory battery on the KLM-367 programmer board. The original batteries leak, and the fluid eats the circuit traces around them. Buy one where the battery is already out and the board is clean, and ask for the inside photo to prove it.
The memory battery on the KLM-367 programmer board leaks with age and corrodes the circuit traces around it. Sound On Sound also flags VCO drift that needs occasional recalibration, and sealed panel pots that can be hard to replace.
Buying guide
We'd buy the Polysix titled serviced at $1,620 delivered, or the tested one with its original hard case at $1,559, and both ship from Japan, so check the voltage plate and plan on a step-down transformer for a 100V unit. There are about 18 for sale, most asking $1,550–2,375 delivered, and Kiwi MIDI upgrades and dealer service claims sit above that, up to $4,194. Whatever you buy, ask for a photo of the KLM-367 programmer board, since the original memory battery leaks and eats the traces around it. Skip the zero-feedback seller, and pay only through eBay checkout on a synth at this price.
$1,383.21est. delivered
The lowest delivered Polysix we'd consider at $1,383, from a US seller. The title makes no test claim, so ask for a video of all six voices and a photo of the KLM-367 board before you pay.
Korg Polysix programmable polyphonic synthesizer 1981
$1,559.00delivered
Titled tested and sold with its original hard case for $1,559 delivered, right at the bottom of the band. The case matters on a 61-key synth shipping from Japan, and you'll likely need a step-down transformer for it.
KORG Polysix PS-6 6-Voice Analog Synthesizer Original Hard Case Tested Japan
$2,526.77est. delivered
Titled Pro Serviced with a Kiwisix upgrade and MIDI, from a US seller, at $2,527 delivered. That's about $150 over the band, but the dealer's Pro-Refurbished Kiwi unit here asks $4,194.
Korg Polysix w/Kiwisix Upgrade/Midi - Analog Polysynth - Pro Serviced
$1,620.12est. delivered
Titled serviced, for $1,620 delivered, near the bottom of the band. Ask what the service covered and whether the old battery on the KLM-367 board is out.
KORG Polysix Analog Polyphonic Synthesizer Serviced Used
Delivered prices include shipping as eBay quoted it to a US address on Oct 5, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Snapshot
Checked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 5, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used$1,383.21est. delivered
$1,300.00 + $83.21 shipping
Buy It Now$1,300.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Titled 1981, with no test claim. Ships from within the US.
Seller: spaceaje
100% positive
Used$1,559.00delivered
$1,559.00 · free shipping
Buy It Now$1,559.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Titled tested, with its original hard case. Ships from Japan.
Seller: shopmin-japan
99.8% positive
Serviced$2,526.77est. delivered
$2,500.00 + $26.77 shipping
Buy It Now$2,500.00
Good buy
Titled Pro Serviced, with a Kiwisix upgrade and MIDI. US seller.
Seller: clarksburgmayor
100% positive
Serviced$1,620.12est. delivered
$1,446.12 + $174.00 shipping
Buy It Now$1,446.12
Good buy
Titled serviced. Ships from Japan.
Seller: tokyo_depo
100% positive
Serviced$1,946.28est. delivered
$1,599.18 + $347.10 shipping
Buy It Now$1,599.18
Our take
Titled serviced and 100V. $347 of it is shipping from Australia.
Seller: lofi_music
99.8% positive
Used$1,158.02est. delivered
$1,000.00 + $158.02 shipping
Buy It Now$1,000.00
Check the seller
Titled working, with a case. Another seller uses the same title, a copied-listing scam pattern, so compare photos.
Seller: cushymusic
100% positive
Used$2,251.00est. delivered
$2,025.90 + $225.10 shipping
Buy It Now$2,025.90
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Check the seller
Zero-feedback seller in Italy. Pay only through eBay checkout.
Seller: urbanofineart2013
No feedback yet
Refurbished$4,194.47est. delivered
$3,999.99 + $194.48 shipping
Buy It Now$3,999.99
Priced high
Kiwi MIDI, titled Pro-Refurbished by a dealer. About $1,670 more than the other Kiwi unit here.
Seller: 123synthland
100% positive
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