” Here’s a Vintage Korg MS-20, its the Mark I grey face filter which is a little bit rarer I believe. The filter is aggressive.
It was serviced in 2008 by LA synth tech “Synthfool” Kevin Lightner, RIP.
He rebuilt the Sample and Hold circuit, replaced a cracked key and the front panel jacks, and generally cleaned it up as well as tuned it.
It sounds good. But is in need of more tuning and cleaning.
I’ve included a video of me playing each key, and then running an arp via Midi to CV while tweaking the VCOs and filters. You’ll see in the video that certain keys ‘wobble’ in pitch. Also, notice the volume knob crackles with use, you might get some intermittent noise like that from the pots. I’m not a tech, but maybe this means the contacts need to be cleaned on it in general and especially the keyboard, it is after all 40 years old.
I’m listing it ‘for parts’ as there is no return and these issues are documented, but I’m assuming someone will clean and tune it and not strip it out for parts, which would be a ridiculous shame..”
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“Vintage 1980s Korg Poly 800 Analog Synth Synthesizer Please Read Preset Issue
“Korg Poly800 with mods
“Up for grabs is a VINTAGE Korg Poly 800ii synthesizer
“Item appears in good cosmetic condition; powers on, display lights up but unable to test; hole in power cord insulation ”
“I’m the original owner of this CS-10, bought it in Japan in 1981. Still in good condition. Sounds great; rich tones – pure analog. All keys/knobs/sliders solid and working. Besides the organic sounds generated from the keyboard, I plugged my guitar and mic into it for very interesting sounds and ideas. Hate to see it go, but I haven’t used it in many years, and I’m downsizing – everything must go. ”
“This auction is for a Yamaha FB-01 Multi-Timbral FM Synthesizer module. The unit is used but in very good condition, showing only minor wear on the top of the module. It has been tested and is fully functional. This is a great sounding unit with outstanding midi-control and 8 part multi-timbrality.”
“This Yamaha DX7 still works – one key has a crack, and there are 3 holes where a mic holder had been placed on the unit.
“Mint Condition-Yamaha DX7 Digital Programmable Algorithm Synthesizer. This well cared for keyboard has been stored in a climate controlled professional home studio. No Dings, Dents, Blemishes, or Scratches. Fully functioning. Comes with original documentation including Operation Manual with original warranty card.”
“Rack holding 8 modules. This is equivalent to having 8 DX-7 synthesizers within reach.
” Works. I cleaned all pots and switches it needs a technician to fix the decay or release of the tone . Unit passes audio , vcos and oscillators are functional but needs to be tweaked by synth tech to be 100 percent . I will list sold as is for parts not working but you can call me and I’ll play it so you can hear it . audio no distortion in signal at all . The only problem I see with unit is when you play a note it works but it doesn’t decay .”
“Pro One Synthesizer, -w- Manual & Case Serial 8405
” Used in working order ” 
“This one is in excellent cosmetic condition and working 100%. Beside the servicing & internal restoration, the bottom metal chassis was professionally repainted and silk-screened as it was pretty ugly and scratched up. Internally, I decided to keep this one stock without adding midi. It is ready to be played and needs nothing!” 
“An original ARP Odyssey MK1 White Face. The synth has been recently fully serviced, including the keys and is working great.
” Arp Solus, sounds amazing, definitely richer and more lush than the reissue. Tuning and calibration on this unit are rock solid, keybed feels quite nice, cosmetically pretty good, sliders are stiff but all work, a few only have minor scratchiness but overall not bad at all, only issue is missing slider cap for pwm mod but I use a key to move it and this works fine. And sounds beyond amazing. ” 
“RAREST of the RARE: ARP Odyssey Mk I (Late Model 2800-1974-5). This is a two-oscillator analog synthesizer, and one of the first with duophonic capabilities (the ability to play two notes at the same time). This allows you to get that wonderful “guitar-like” distortion when used with Distortion/Flange effects.that bands like Ultravox used to good measure as a lead synth. These early models have a sound like no others.” 
“Super rare Buchla Thunder Midi Controller. This item is beautiful and they don’t come along very often. The last one I saw for sale was almost 10 years ago. Don’t miss your chance at owning a piece of synth history.
“Here’s a great little keyboard in fantastic condition, especially considering it’s been around for about 40 years! As well as retaining all the shiny coloured caps that usually seem to go missing from the knobs and switches, it even still has the cardboard templates that feature suggested settings.
“I have loved having this OP-1 however since I bought it my circumstances have changed and I just don’t have enough time to spend making music on it.
“This listing is for gently used Kawai K5000S (61 key) vintage additive synthesizer. It’s an awesome and very unique synth that is has its sounds based entirely on ADDITIVE engine. It can also be used a MIDI controller with many of the knobs and very cool programmable arpeggiator. There are many cool videos on youtube showing the potential of this awesome synth so if you’re not familiar with this synth, you should watch/listed to some of them and you won’t be disappointed.
“This is a classic, vintage SP-12 made by E-mu Systems, Inc.
“This unit is in good condition and functioning. Comes as you see it with the power cable.”
“This Make Noise Modular Shared System was purchased directly from the factory is Asheville, NC in 2016. It has all of the original modules that came with the complete system and I have added a Make Noise ‘Tempi’ and a Make Noise ‘MMG Filter’. It comes with the CV Bus, original case and lid, and a large number of assorted size patch cables – everything you need to get up and running. There are a few stackable cables included and the power cord. This unit went from the factory to my smoke free studio and has never left.”
“Im selling my mint condition Oberheim Xpander. It has very low miles. It comes from a smoke free studio. These pics don’t do it justice it looks way better in person. It sounds amazing and works great. This is the better built US version. All of the screens are bright and clear. All of the buttons and encoders work great. It always passes all of the calibration tests. It comes with the power cord and original Xpander factory patches cassette tape.” 
“New Without box. This monomachine SFX-60+MKII has not being used and it still has the protective film on the screen. It comes with a manual and the original power adapter ”
“Teenage Engineering OP-1 Synthesizer, near perfect condition (has been used sparingly). Has USB port and cable for charging.”
“This K3 work fine and is very good condition!!
“For sale is my Waldorf Microwave XT analogue synth. It is in very good condition and works great. It just came out of the shop where I had all the knobs checked and cleaned (so NO jumpy encoders, which can be a problem on these units). Everything is 100% working. There are two minor cosmetic issues which do not effect its functioning. There is a scuff mark on the screen, and one of the knobs has a crack in it. See pics for these two minor issues.”
“In good condition”
“Only 1/200 manufactured! Warm SSM Filters!
“I have added several pictures they show the condition of the keyboard.”
“Keyboard is in really good shape. Very playable. Serviced around a year ago. All functions buttons, keys, knobs, etc…. working as they should. Sounds amazing!!!
“Good condition. Tested with headphones and did work but did not test all the functions. Missing numerous caps to sliders and volume but they all still seem to work fine. I do not know if all functions work correctly.”
“The infamous Moog “The Source.” A classic, rare one of a kind piece used in thousands of pop songs through the decades.