“I bought this years ago to restore and just repaired the power supply temporarily, as you can see by the wire nuts. It turns on and makes some cool sounds but clearly isn’t working well. To be safe I am selling it as not working, for parts, but many lights come on and buttons react, and keys make sounds.”
Click here to search for synths on eBay
This website is reader supported. When you purchase items on eBay through the links on this site, we may earn an affiliate commission at no cost to you. Read our Privacy Policy for info.
“As you can see it’s got some graffiti from the 80’s. I bought it in 82. The keyboard is a bit uneven in key height but all the keys work. All the knobs and everything works but it could probably use a cleaning.”
“1984 Sequential Circuits DrumTraks Drum Machine in Working Order! with some quirks…
“Sequential Circuits Prophet-5
“Used tested working. Comes with adapter, operational manual, midi guide, data and programs cassettes shown.”
“Good working condition.” 
“You are looking at a Sequential Circuits Prophet 5 Revision 3.3 serial 4266 with factory midi kit installed. The revision 3.3 was the last version of the Prophet 5 produced. It has the latest 10.5 system ROM and has 120 patch memories. This Prophet has been fully serviced by Norm Leete in Gloucestershire and has had a new memory battery installed. Norm is well respected and does much of the servicing work for the VEMIA equipment auctions. The keyboard plays like new as it has been fully reconditioned with new rubber key bushings. There are a few minor marks here and there but overall I would say that this Prophet 5 is in excellent condition and in perfect working order. The original user manual will be included. I have owned this synth since the late 80’s and will be very sad to see it go.” 
“For Sale. My beloved Pro One synth which I have owned from new. It has NEVER BEEN GIGGED and has spent it’s entire life flightcased or sitting in my studio. There are two small cosmetic scratches (shown in the pics) which don’t affect its performance in any way. Like all things of its age, it could do with a spray of pot cleaner (and I would recommend that the buyer does this), but is in full working order and sounds great. Extremely rare now and hard to find in this condition. If you love that fat analogue sound, get bidding and you wont be disappointed. ” 
“This is a very nice Sequential Circuits DrumTraks unit that was part of a clean, smoke-free home studio. Used sparingly. It works well and is in excellent cosmetic condition. ”
“This is a very nice Sequential Circuits Six Trak synthesizer unit that was part of a clean, smoke-free home studio. Used sparingly. It works well and is in excellent cosmetic condition.” 
“Cosmetically there are minor scuffs and fingerprints around knobs however nothing that would decrease its value. Woodside panels are well taken care of. Everything as far as the sound is concerned is working 100%. All pots and buttons function beautifully as well as inputs and outputs. Gli Gli upgrade sounds great helped with response timing and filled out an already rich sound.” 
“Everything works except that it will not save patterns when it is turned off. I believe The battery needs replacement. also the two front screws that hold down the face of the machine are missing”
“SEQUENTIAL CIRCUITS PRO ONE SYNTHESIZER
“This is a very rare Sequential Circuits Piano Forte made by Seil. It has a different fuse cap not shown in the pictures and I will include the missing TMS3617 Top Octave Chip missing on the upper voice card as shown in the pictures. I purchased the chip to try to repair this unit but no longer have the time. I purchased the unit without the chip not knowing before hand so I believe the unit will still have issues even if the IC is installed. It only makes a slight clicking sound when keys are pressed. No other testing was done. It looks to be in pretty decent shape and clean as you can see by the pictures. It is being sold “As Is”. Great refurbishing project!”
“This unit is in almost new condition and works flawlessly. This is a great and rare find.
“Selling my p600 of which I am the original owner.
“Missing buttons for track 5 and 6 and also sound select 1 and 3, transpose and time button also missing. They are just simple rubber buttons and should be able to be replaced if you can find some. The knob for the master volume is also missing.
“Sequential Circuits Poly Sequencer Prophet 5
“Collection only.
“Everything works except that it will not save patterns when it is turned off. I believe The battery needs replacement. also the two front screws are missing”
“Sequential Circuits Six-Trak in great condition!
“This item came from a estate sale. It is in very good cosmetic condition. It’s power on. I don’t know how to test it. It might work or it might have issues. I am selling this for parts or repair to avoid any potential issues. If it turns out to work, lucky you. SELLING AS-IS, NO REFUNDS!”
” Prophet 5 rev3.3 120 memories plus midi, recent serial, completly refurbished and calibrated from a dave smith associated laboratory in italy in this year.
“Not working condition I plugged in the lights didn’t turn on I don’t know where you can get this piano fixed
” Up for sale is this rare, vintage 1980s Sequential Circuits Multi-Trak 6-voice polyphonic analog synthesizer. Synth is in overall good condition. Shows minor signs of wear & use. Has a massive sound & really fun to mess with, especially the chorus section! All the parameters seem to function properly, however the Pitch Bend wheel is not working (feels stuck). The ModWheel is working properly though and feels great. Comes with power supply cord.” 
“SN/???
“Sequential Circuits Pro One , in fantastic condition. J-wire edition and serviced in December 2017 by James Walker at Synth Repair.
“SCi Prophet-600 programmable polyphonic synthesizer
“Offering up this analog gem. It’s been in the family for decades, but hasn’t seen much use lately.
“The sequential Pro-One is one of the most desirable analog mono-synths out there. This is a great find for someone who likes well-cared for synths that work as they should and look great. This unit has lighted, aftermarket, pitch/mod wheels in addition to the wood upgrade.” 
“This unit is in almost new condition and works flawlessly. This is a great and rare find.
” We purchased this a number of years ago (over 20) and used it in our little home studio and unfortunately is not working at present. Not sure of the repairs needed – we are just trying to clear things out so are selling this classic unit as is. It is clean with not much wear showing but alas, it is non-operational.” 
“This unit has some minor cosmetic wear and tear from over the years. A little on the face plate and some on the wooden side panels. Please see all photos. Overall is a really nice synth and minor cosmetic wear does not detract from usability.”
“For sale by original owner, purchased 1986, serial #02241. Exterior condition: excellent; never left my studio – but diskette drive needs replaced (“Lh” locked head error msg, will not read disks). (There have been replacement drives on the market – also USB-based floppy emulators from companies like HxC and N-Drive that specifically support the Prophet 2000, but I have no experience with those.)
“This is for a used Sequential Circuits Six-Trak Vintage Analogue Synthesizer. The body is in decent shape has some nicks and scuffs as shown in picture but nothing major. Keys work perfectly, sounds awesome. The speed knob works fine but i think it has been replaced as it’s a little wonky but still works fine(right knob shown in picture) The 6 key works but sometimes needs to be pressed hard and last-the rubber around the end of the outlet plug is starting to degrade as shown in picture. All that said still works good and sounds amazing.”