“This is a great keyboard. Modern classic. A lot sounds on this came from Eric Persing, known for his sample CD collections & programming work.
This particular JD800 has seen a lot of action.
The good — all the keyboard keys work and feel great, as does the pitch bend wheel. The screen is bright and easy to read. The sound outputs all sound clean. The bank number buttons make it easy to go through the great sounding presets. Yes, it is playable as-is.
If you’re looking for a JD-800 much cheaper than all the others to plug in and play the bank number presets, you’ve found it.
The not as good — this synth is older and has seen a lot of use. It shows a fair amount of cosmetic wear and tear. I would recommend the next owner take it to a tech for a tune up (including going through the keyboard and cleaning or replacing the faders and some of the buttons).
Yes, all the faders respond / change their specific parameter when you use them, but they are “jumpy” / do not respond as they should. Because of this I do not consider the instrument 100% functional so am selling it as-is for parts or repair, no returns.” Click here to search for synths on eBay
“KORG DELTA VIMTAGE SYNTH
“CONDITION: WORKING. SOUNDS GREAT. DOES HAVE CORNER WEAR (SEE PHOTOS). 
“Classic bass/ percussion plus plethora of possibilities with this beast. Legendary filter…. blah blah.
“Selling my 1982 Korg Trident MK2. It’s in fabulous condition considering it’s age and has just been fully serviced, tested and tuned by the synth guru that is James Walker. I also had him install the CHD Elektroservis midi kit so it’s as bang up to date as it’s possible to be.
“Original 1978 Korg MS-20 Synthesizer in excellent working condition.
“This is the classic analog polyphonic Korg Delta synth and string machine. This is a very unique 1977 instrument featuring a separate polyphonic string and synth section.
“Korg MS-10 is an analogue synthesizer created by Korg in 1978. Unlike its bigger brother, the MS-20, the MS-10 only has one VCO. It is monophonic and has 32 keys. The MS-10 is well known for its huge sounding electro bass sounds. Wikipedia” 
“I am selling this item for parts or not working because it’s only been power tested. I have no idea how to test this item any further. I turned and pressed every button but nothing made a sound. Please note that one of the keys is noticeably broken (shown in pic) Beyond that no further testing has been performed. ” 
“A rare analog modulation pedal from Korg. Alas, I bought it to fix it, but I don’t have the time to get it going again. IT IS MISSING THE BASE. Battery-powered. Cool vintage piece. The circuitry is pretty simple, so it shouldn’t be too hard to fix. It was often paired with the Trident, I believe.” 
“Korg Poly800 with mods
“KORG M-500 SP Micro-Preset Vintage Analog Synthesizer (model with speaker) works and sounds great, does have some cosmetic flaws, I see the vinyl covering peeling , scratches ,may need a better cleaning. This item is part of an estate liquidation,this item is used and works , item gets good sound , we are not experts with this type of item , I am selling as is due to item not being tested by a prof service” 
“With original manual. Non original packaging. Slight scratches as shown in pics. Wonderful condition. Buyer to collect” 
” Offered for sale is a fine vintage Yamaha SY-2 synthesizer. Instrument is in very good condition. Outer case displays several surface scratches from age and usage. Face of keyboard presents light wear and light scratches from normal use. Power cord is fine with no rips or tears. Interface and keys are great with no missing knob or keys. Keys are not loose or chipped (as shown in photos). Unit powers on well, with all the knob, switches, and keys working perfectly. Plugs on back are working as well with no signs of rust. When plugged into a speaker or with headphones, the sound is clean with no static or scratchy sounds. This unit is in full working condition and is basically gig ready. Top case closes as intended and locks, removes with ease. Case also comes with its four leg stands (they screw on fine). Synthesizer has been fully tested in all aspects and performs excellently. KEY TO LOCKING CASE IS NOT AVAILABLE. Photos shown are of the actual item for sale.”
“The item is shown in the rack near the top. It’s in perfect working order! No issues!”
“Yamaha FM sound module in great condition, with high quality caps and op amps installed to reduce noise level and improve frequency range to original spec.”
“Selling as is for parts/repair.Turns on but hasn’t been tested further than that.Body has some dings.It also has some rust on the bottom.Front panel looks a little crooked from back panel.Probably an easy fix.Theres some dirt on inside of the window.” 
“This FM synth unit is used but still working great. Comes with attached cord. NO other attachments included. “
“For Sale….. Yamaha TX802 FM Rack Module !! Bought New ! Kept well. “
“Yamaha CS30 Vintage Monosynth for sale. Item has been serviced. All electrolytics and tantalum caps replaced, then tested and calibrated according to the service manual. (Test reports included). All knobs, faders and busbar cleaned (Conductive Rubber Busbar is extremely reliable).” 
“Plays very well. Has some removable stickers for my favorite combinations. with cartridge and bag. All reminder stickers and markings can be easily removed. ” 
“Yamaha DX100 in Very nice condition. Works perfectly.
“FOR SALE: a Sequential Circuits Pro One analog synthesizer with professionally restored electronics and a brand new 2018 Techsmechs keyboard installed- no j-wires to clean and/or replace, no faulty membrane keyboard- this has a brand new, newly manufactured, modern replacement keyboard installed and it is purely awesome; this synth’s keyboard mechanism is better than that of any other Pro One currently on the market.” 
“This Six-Trak is in great condition, just came from a recent service and calibration. It is working and sounding great!
“this Prophet 5 has been in my possession since the day it was purchased in 1979 it is in perfect working condition it is just been refurbished from top to bottom” 
“This Six-Trak is in great condition, just came from a recent service and calibration. It is working and sounding great!
“Sequential Circuits Prophet 600 with GliGli Chip Update installed.
“Item is in EXCELLENT CONDITION!” 
” *Excellent Original Condition Classic Analog Synthesizer, early serial No Mk I model.” 
“ARP Omni Synthesizer for auction. This synthesizer does not work and will be sold in as-is condition for parts or not working. The aftermarket LED slider mod was installed and the original sliders are included with the sale of this item.”
“This listing is for a Cwejman MMF-2 eurorack module
“Up for auction today is a great Polyfusion Analog Synthesizer Sequencer & Row Modular AS 1-R. Please see photos for condition. Thank you & Good Luck!” 
“This is a Kawai K1 Digital Synthesizer. The Keyboard is in good condition and it is mostly functional. However there are 4 keys whose contacts might need some attention because they don’t always fire off with a light touch. Specifically they are the A#, D#, B, and E of the middle section. Power supply included. ” 
“Unit is in like-new condition, with no visible scuffs or scratches and all keys working properly. Comes in original styrofoam case, though this is a bit worse for wear and only includes one of the original teenage engineering rubber bands. Includes charging cable (though not the original one)” 
“I’ve been working on this system for a while. I’m moving soon, so I need to downsize. Unfortunately this beast has to go. Everything works great and sounds beautiful.