Kawai Synthesizer-100F

“An absolute classic and quite rare mono synth from Kawai

This one is in excellent cosmetic condition with barely any obvious signs of use… but it has been used and it does have some signs of age if you look carefully.

There are no big dents, scratches or battered wood on this one… it’s really good just some minor little marks that come with age.

It was serviced when I got it and it still works great but I have noticed a few keys retrigger until you play it more.

As much as I love this synth it’s just not getting used as much as it should so I have decided to let it go to someone who is going to play it more often.” Click here to visit listing on eBay

Kawai K4r Project Machine

“This is for a Kawai K4R 16 Bit Digital Synthesizer Module in *Parts/Repair* Condition
Not POWERING ON…Nothing.. Not a click, not a flicker.. I could not get it to fire up with my universal/Multi-tip adapter… NO further testing performed.
I honestly think there is just a little corrosion at the POWER input or perhaps a FUSE that needs to be replaced?
The device looks to have never been opened up…
If you are good with vintage electronics this will most likely be a simple repair

NO Power supply or other pieces included.. Main device ONLY

Missing 1x SLIDER KONB…… Otherwise, VERY GOOD COSMETIC CONDITION…
No other flaws or issues to point out
NO rust, dust or oxidation
NO evidence of being dropped
NO burnt electronics smell
NO rattling or loose pieces”
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Kawai K4

“Back for sale! Kawai K4 with new flourescent green LCD display, mostly new capacitors on main board, new volume slider, and headphone opamp.

Includes original manuals and Kawai power adapter.” Click here to visit listing on eBay

Kawai K1

“Kawai K1 II 61 key Synthesizer. An 80s/90s classic! Used, but in fully working condition as far as I can tell, with original PSU. I bought this for just one sound, which I was unable to recreate with anything else (I had an original K1 in the late 80s), but I no longer have a use for it. 2 tier stand included if you want it. ” Click here to visit listing on eBay

Kawai K1 II

” Kawai K1 II 61 key Synthesizer. An 80s/90s classic! Used, but in fully working condition as far as I can tell, with original PSU. I bought this for just one sound, which I was unable to recreate with anything else (I had an original K1 in the late 80s), but I no longer have a use for it. 2 tier stand included. You can collect in person, or I can deliver within a reasonable distance of Hereford, or if I’m going to be in your area. UK BIDDERS ONLY PLEASE.” Click here to visit listing on eBay

Kawai K1m


Used in good condition, never gigged only used in my home studio.

Unit has a very bright backlight LCD display and comes with the original AC Adapter. Included is a photocopy of the rare and hard to find “Sound Making Book” by Bob Maetas.

I will also include a CD-ROM with the Original Manual, Wave List and Hard to find Service Manual (just in case), I will also include my folder of Kawai K1 sound patches in SysEx format.” Click here to visit listing on eBay

Kawai K4

“Most of the capacitors on the main board have been replaced with low ESR 105C Panasonic, and I replaced the 1uf electrolytes with much improved film to further reduce noise in the overall circuit. I replaced the NJM4556D headphone opamp with JRC2068DD which has faster slew rate and higher bandwidth. All these updates added more clarity on the high end (while still keeping the 16 bit K4 character) and with the mods it sounds better than the original K4 when I did a direct comparison against the unmodified one.

I replaced the LCD display with a much better one and installed a 10k trimmer resister. To adjust the display brightness simply insert a screwdriver in the + slot of the trimmer resister and gently turn however I already adjusted it to the best luminosity. I have also performed this modification to my other K4s since it’s a great improvement over the original display.

I installed a new volume slider potentiometer. It is now much smoother sliding than the original. And I also installed the latest Version 1.4 OS chip, purchased new.

I have found much (but certainly not all!) of what the K4 is capable and will keep the patches I designed after the circuit upgrade.

There are individual buttons to select or mute each layer which means that parameter access/sound design is relatively quick. Immediate muting lets you quickly hear the layer you are working on which is important for sound design. The K4 excels at resonant transcendent beautiful digital crystalline pads and the resonance is so high and fizzy that it can devolve into sizzling distortion so I never use maximum but it makes for a very interesting unique sound. Click here to visit listing on eBay

Kawai K4

“Vintage KAWAI K4 Synthesizer Keyboard Vintage Synth is a unique sounds digital keybaord. Some may describe it as dirty digital but, its something special.

All the keys, buttons, sliders, and outputs work as they shoukd with no issues.

Comes with printed owners manual, service manual & original power supply.” Click here to visit listing on eBay

Kawai K3

“Vintage Kawai K3 Digital Wave Memory Synthesizer.
I’m the original owner of this fine vintage synth. You probably know that its synthesis techniques are pretty unique, and that the keyboard has a great pressure after-touch for controlling any patch parameter by leaning into it. Comes with an extra memory module.
Everything works well, with the following exceptions:
The volume slider wasn’t working so it was bypassed. For live control you’ll want a volume pedal.
The headphone jack isn’t working, but should be repairable. The low E key is a little tilted after a fix, and plays fine.
All outputs, pitch wheel, and edit controls are great, and the sound is perfect.”
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Kawai K5000W

“Kawai K5000W Advanced Additive Workstation Synthesizer. Condition is “Very Good”. Includes the manual, a sustain pedal, power cord, the original two floppy disks, and I’ll also include 2 MIDI cables.”
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Kawai K1 II Project Machine

“The front of the keyboard has received water damage but this did not spread far inside. There is no sound out of the main outputs, but a distorted sound can be heard from the phones output. I suspect the issue is the volume control having water damage and therefore being stuck on 0. This could be an easy fix. The the main board comes from another synth and had an issue where every eighth played note would suffer from digital distortion. There are 2 broken black keys at the top of the keyboard and 1 cigarette burned white key, although the keyboard does not smell of smoke.”
Click here to visit listing on eBay

Kawai K1m

“Really good condition inside and out as can be seen from the pictures, no signs of old age on circuit board, original Sanyo battery has no leaks and caps look good. (Battery may need replacing at some point).

Externally the device has a few minor marks and has two extra holes on the rear panel for wall mounting. Other than that looks good and sounds good.

No original PSU however i will include a 12v 2A PSU that i have used.” Click here to visit listing on eBay

Kawai K1r

“KAWAI K1R Retro Vintage Classic 19” 1U rack mount Synth. Rare.. Condition is “Used”. Dispatched with Hermes.

In working order and comws with the power supply adapter which has a good long lead.

Can be rack mounted in a fre but also has rubber feet to sit on a table as a standalone unit.

Fromt is relatively blemiah free, a few marks on top, but otherwise in good order.

Has MIDI In, Out and Thru and Main Out 1/4 inch jack sockets.

I liked this unit becauee its simple unlike modern units with millions of options, thats not to say you cant get some good analogue vintage sounds out of it.” Click here to visit listing on eBay

Kawai K3

“This particular unit is in very good cosmetic condition for an almost 40 yr old instrument. I tested all the sounds and all the selections are in working condition. The only thing I did find was 2 keys that will need attention. Please note the keys with the color stickers, the blue stickered key makes no sound and the brown sticker key needs to be pressed hard to make sound. Both keys were working when I bought it some 15 years ago but its been in my garage ever since and I am sure some dust has collected in the contacts over the years. I’ve seen videos on youtube on how to clean sticky or dirty contacts on keys, fairly simple but I just dont have the time or drive to do this anymore so I must sell it AS IS. ” Click here to visit listing on eBay

Kawai K3m

” Cosmetics are excellent. Never taken out of studio. No dust exposure. Always used with surge protector and clean power supply on a separate circuit. Not many hours of usage. Manual is online. I have the original docs but will list them separately when I find that box, in a couple weeks.”
Click here to visit listing on eBay

Kawai K3

“This particular unit is in very good cosmetic condition for an almost 40 yr old instrument. I tested all the sounds and all the selections are in working condition. The only thing I did find was 2 keys that will need attention. Please note the keys with the color stickers, the blue stickered key makes no sound and the brown sticker key needs to be pressed hard to make sound. Both keys were working when I bought it some 15 years ago but its been in my garage ever since and I am sure some dust has collected in the contacts over the years. I’ve seen videos on youtube on how to clean sticky or dirty contacts on keys, fairly simple but I just dont have the time or drive to do this anymore so I must sell it AS IS.

This classic is in need of maintenance or repair and is for someone who has the passion and desire to spend an afternoon taking it apart and give it the maintenace and attention it needs. Everything else including selectors, soundbanks, digital readout, pitch/tone wheel, looks to be responsive and in good shape but I am not a professional so just remember that. ” Click here to visit listing on eBay

Kawai K4r

“Owner for almost 30 years offering truly barely used (VERY LOW hours), studio use only, never gigged, KAWAI K4R 16-bit Digital Rack MIDI Synthesizer Sound Module, circa 1989. These are hard to find and have a unique, versatile sound.

Unit has been fully tested including LCD display, all buttons and sliders, audio outputs, and MIDI ports. Internal battery recently replaced. Includes original genuine Kawai (made in Japan) power supply AC adapter and printout of instruction manual.” Click here to visit listing on eBay

Kawai K1m

“Classic 1980’s synth module which shares some of the sonic imprint of the Roland D50 / D550 and other 1980’s digital synths, but has it’s own thing going on which makes it well worth having. I’ve sampled the sounds I use most so someone else can have some fun with it!

In goods clean shape with only minor age-related signs of wear, bright clear display, original UK PSU included and works as it should. Rare set of original paperwork too, including the Owner’s Manual, Wave List and a colour brochure. Lastly it comes with the boxed DC8 RAM memory card, which has the little Kawai dust sleeve and even the plastic tray that sits in the box (I’ve just put a new coin-cell battery in the cart so it’s ready to go).” Click here to visit listing on eBay

Kawai K4r

“Kawai K4r – Vintage digital synthetizer module,8 multi,16 voices,individual outs. Condition is “Used”. Dispatched with Royal Mail 2nd Class. Nice digital filters. Fully working. VGC for age apart from chip at bottom below volume control. No manual.” Click here to visit listing on eBay

Kawai K1m

“Fully tested and working properly. The K1 is one of Kawai’s most economic digital synthesizers in the K-series. The K1 has 256 digital samples of waveforms, 50 of which are from acoustic instruments. You combine up to four wave shapes to create very new and unique sounds. The K1 is capable of very good acoustic recreation, excellent unique synth sounds or at times, completely noisy walls of complex sound.” Click here to visit listing on eBay

Kawai K3

“Keyboard has been cleaned and fixed up by a professional. Slightly sticky on the bottom of the keyboard, Signs of age and wear on the entire keyboard in general. Missing the volume knob but it still works and is still usable. The Middle “G” Key was broken of and my friend epoxied it back, and tested it with a high intensity, it’s not coming off! Entire piece works great and he was suprised at how great this particular model sounds, as we fix these types often. Backup Memory and Battery very good, very clean inside. Random marks and scratches but excellent condition” Click here to visit listing on eBay

Kawai K1

“In almost playable condition, as a few keys don’t work – unsure whether this is something internal, physical, digital etc. It was “gifted” to us in this condition, and seems to have about three screws holding it all together – not the greatest of signs. But it does fire up and play through the headphone socket, although I haven’t got any MIDI gear to test in and out functionality so bear in mind I can only verify that “yes it kinda works”

It’s also not in the cleanest nick, with a few scratches and what have you, also the top of the joystick is missing, although I can’t work out what it even does. The pitch wheel and mod wheel do work fine, I can say that.” Click here to visit listing on eBay

Kawai K1m

“The two memory cards have new batteries installed and working. The original manual will also be included. The two memory cards are worth $140-.$180 alone. I’ll also include a MIDI cable and Universal power supply.” Click here to visit listing on eBay