Pro One

“Original Sequential Circuits Pro One Synthesizer Model 100 #4807 J Wire Keyboard.
Bought this from the original owner. Comes with OG manual(damaged but completely intact) and all functions working even tested the CV/Gate inputs. Very clean and recently serviced in Oakland, CA. Minor scratches and old tape residue pictured. All keys working though I would upgrade it with the Techsmechs TM-2 as this is the original J-Wire keyboard. ” Click here to visit listing on eBay

“Rear paint damaged by previous owner on removing stickers.

Recently replaced keys with a Fatar keyboard TM-2 from techsmechsvintagesynth.com so the synth plays beautifully.

Also capped the knobs with Prophet 5 caps.

This synth is fully working and sounds brilliant.” Click here to visit listing on eBay

“Vintage Sequential Circuits Pro One Analog Synthesizer

Brand New Techsmechs TM-2 Keyboard installed (over $250 value) which is a huge upgrade. Plays perfect!

Keyboard has just been cleaned, tested, and tuned. Ready for action!” Click here to visit listing on eBay

“IN ORIGINAL CONDITION ALL KEYS/SLIDERS/KNOBS/OUTS FULLY WORKING HAS ORIGINAL KEYBOARD WHICH IS A BIT CLUNKY PERSONALLY I HAVE ALWAYS PREFFERED IT THIS WAY FEW MARKS AND SCRATCHES BUT IS 40 YEARS OLD.. MY NAME IS JAIME READ(LHAS) AND I HAVE BEEN RELEASING MUSIC FOR OVER 30 YEARS THIS IS PART OF MY STUDIO SET UP AND HAS NEVER BEEN GIGGED OR IN A SMOKE ENVIRONMENT ALL ITEMS CAN BE TESTED BEFORE PURCHASE YOU CAN COLLECT FROM CRAWLEY OR LIVE WITHIN 50-80 MILES I MIGHT CONSIDER FURTHER AFIELD BUT BUYER WILL PAY PETROL AND SOME COSTS DEPENDING ON WHERE YOU ARE NOT SURE I WOULD TRUST A COURIER…AND WOULD FEEL ALOT BETTER FOR YOU TO BE HAPPY.” Click here to visit listing on eBay

“This vintage Sequential Circuits Pro One 100 Monophonic Analog Synthesizer Keyboard is a must-have for any serious musician or collector. With its 37 synth keys and analog construction, it’s a unique piece that will add character to any studio or stage performance. Made in the United States in the 1980s, this keyboard synthesizer is a true gem of the era. Whether you’re a seasoned musician or just starting out, the Pro One is sure to inspire you. One potentiometer is scratchy. My just need cleaning. That said. I am not sure of the complete functionalty of synth. I downloaded the programing guide and played around with it. Not knowing what it’s supposed to sound like. I am selling it as is. Yours to refurbiah if needed. ” Click here to visit listing on eBay

“- In fair condition
– The power switch on this unit is missing, so we were unable to fully test it. However, when it is plugged in, the red LED Gate indicator will light up. So it may just need to have a new switch installed. We cant guarantee the extent of this unit’s functionality.
– Includes Power Supply
– See All Photos” Click here to visit listing on eBay

“Purchased at a local estate sale. Took it home and plugged it into an amp. It seems to function well, although a few of the upper keys seemed a little touchy , meaning that I didn’t hear anything, and then pressed it again and heard it, sometimes going in and out. Not sure what that means. There is also one of the middle keys which is raised a little more than the others. Maybe something under it. Just can’t see anything with a flashlight. I am not at all knowledgeable about this type of thing, so I am trying to describe to the best of my knowledge. There are a flew blemishes on the sides as well as the base of the synthesizer, as I showed in some of the photos. One more thing, is that the power cord has electrical tape in a number of places. It seems pretty secure though. I plugged it in, and it worked fine. I did see photos of other identical synthesizers , and it looks like a few stickers are missing . A Pro One sticker, and a Sequential Circuit sticker .Please view photos.” Click here to visit listing on eBay

“This keyboard has just been professionally serviced by the best place for vintage keyboards in the area, Bell Tone Synthworks in Philadelphia. It needed only a cleaning, and one key was stuck. They refurbished the whole keyboard, rebuilt the power supply and cleaned every contact. Receipt will be included, and the picture of that receipt is in the pics. It is basically MINT.” Click here to visit listing on eBay

“Up for sale, a 1980 Sequential Circuits Pro-One Model 100 monophonic analog synthesizer in exceptional condition and in perfect working order. Introduced in 1980, the Pro-One was designed to be a smaller, simpler version of its renowned elder, the Prophet-5. This well-kept first-year example has been professionally serviced, with all contacts cleaned and all functions operational. ” Click here to visit listing on eBay

“Missing switch in the LFO clock section otherwise great condition. Welcome to test on collection.” Click here to visit listing on eBay

“Sequential Circuits Pro-One Analog Monophonic Synthesizer. Condition is Used. Shipped with USPS Ground Advantage. ” Click here to visit listing on eBay

“Sequential Circuits Pro-One Analog Monophonic Synthesizer. Condition is Used. ”
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“This vintage Sequential Circuits PRO ONE synthesizer is a must-have for any music enthusiast. With 37 keys, this analogue keyboard is one of the most sought after . This is a completely unadertated version. No midi just the traditional cv in and out. Many modern drum machines and sequencers sync with cv and gate now and this Pro-One has been used with a beatstep pro.

With its unique analogue sound it has been used back in the day by the likes of Vince Clarke , Joy Division, and pretty much any credible artist .

Duel occillator It has a great arpegiator and short but punch step sequencer which is just a joy to use.

I have owned it snce 1982 and have recently cleaned it inside and out. The Keyboard is quite clacky and suffers from re-triggers but its 40 odd years old. You can replace the keyboard for a more modern one for about 200euros but I want to sell it in its original unadulterated form.” Click here to visit listing on eBay

“As seen in the pictures supplied, the panel and synth are in really nice condition – my opinion 9 out of 10.

One side cheek has a gnarled edge on the upper corner, but that does not affect the functions of the instrument. There are sellers who offer replacement side cheeks elsewhere on eBay).

The rubber key bushings have recently been replaced and the synth was serviced at Synth Restore. The keyboard is the J-wire version.

As you can see and hear from the video I uploaded, the unit works perfectly.” Click here to visit listing on eBay

“here im selling a very nice example of sequential circuits pro one classic analog synth

its in very nice cosmetic condition and fully working order

has been serivced before and the keybord rebushed” Click here to visit listing on eBay

“This unit is in Good to Very Good Cosmetic Condition. It does NOT WORK, and it has an issue with 2 pots on the top left corner. Includes Owner’s Manual and Technical Manual as seen in pictures.
Selling AS-IS, NOT WORKING< NO RETURNS! " Click here to visit listing on eBay

“I bought this Pro 1 brand new from Rod Argents Keyboards, Denmark Street, London, back in August 1982. It was the first synth I ever bought and my favourite too. It has never been gigged, but did spend a few years up my loft. However, for the past 8+ years it has been in my spare bedroom, mainly sitting on a stand doing nothing. I was hoping to get back into my music, but nothing has really happened, so I thought rather than let it gather any more dust, I may as well sell it and let someone else enjoy it. The original manual is still present. PLEASE NOTE Pick Up Only, this will give you the chance to test the machine before taking it and prevent damage in transit.

Needs a service, as the lower F key does not work and some of the pots/knobs could do with a clean-up. Also, small break in top of panel edge (see photo), but nothing major. Additionally, the side panels have been covered in white sticky-backed plastic, which is a little untidy in places. This could possibly be removed and the original wood re-instated, with a bit of time and effort.”

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“Experience the incredible sound of the Original Vintage Sequential Circuits PRO ONE Prophet One Analog Synthesizer.

With 37 high-quality keys and a variety of input/output ports including USB out, MIDI (DIN) in/out, and 6.35 mm TRS out, this analogue synthesizer is perfect for any musician or music enthusiast.

This keyboard synthesizer also features a pitch wheel, modulation wheel, and a pedal input, allowing you to create a unique sound that is all your own.

Whether you’re a professional musician or just looking to dabble in the analogue synth world, the Sequential Circuits PRO ONE is the perfect addition to your collection.

Refurbished with MIDI in and MIDi out.

As you can maybe tell by the video. I don’t really want to sell this. This is one of my favourite synths ever. Howeve, it’s in excellent, wonderful condition and it needs to be played more than I play it.” Click here to visit listing on eBay

” One of the knobs are missing. One of the pods has little resistance and will likely need to be fixed. The unit turns on but I am unable to fully test it. The wire has some imperfections on it as shown is some of the photos. The unit has some cosmetic wear. The keyboard piece is currently detached from the board and will be shipped out separated. There are some screws that I will ship out in a small bag. Everything that is included is shown in the photos. The unit is being sold as is for parts and repair. Please see photos for more information about the condition and any imperfections I might have missed. Again the unit is being sold as is. Thanks for looking. ”
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” Sequential Circuits Pro 1 synthesizer in superb condition. I have owned this from new for about 40 years after buying it from Rod Argent’s shop in Denmark St in London, and apart from a few gigs in the 1980s it has spent its whole life in my home studio with only light use. It is the more desirable j-wire keyboard model and I have recently replaced all the key bushings so it plays like new again. All the controls work and are noise free (there is some slight noise at one point on the filter amount knob but I’ve never found this to be a problem in use). Note that there is no midi capability on this synthesizer but it can be added by using a Midi to CV converter such as the Kenton Electronics Pro Solo Mk3.
Also included is the original operation manual which explains how to use everything and how to adjust the tuning and scales, although I’ve rarely needed to do this as it has always been very stable. I will also include the original box that it came in, which is serviceable but looking a bit faded and tatty after so many years in my loft.
I have listed this as collection only due to the synth’s high value and the risk of it getting damaged in transit. ” Click here to visit listing on eBay

“Audio Out
Audio In
Filter CV In
Gate Out
CV Out
Gate CLK In
CV In” Click here to visit listing on eBay

“Audio Out
Audio In
Filter CV In
Gate Out
CV Out
Gate CLK In
CV In” Click here to visit listing on eBay

“Sequential Circuits Pro-One Vintage Analogue Synthesiser – Excellent condition and full working order, J-wire keyboard version. The classic analogue monosynth, with a huge range of sounds. Includes custom dust cover. The keyboard contacts were cleaned when I got it and it works fine, with occasional sticky contacts. It hasn’t been used for a while and would benefit from another clean if using the keyboard.” Click here to visit listing on eBay

” Sequential Circuits Pro One 37-Key Mono Synthesizer” Click here to visit listing on eBay

“Extremely rare Sequential Circuits Pro One Keyboard in good to very good condition. All original, not refurbished. Plays great.”
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“Fully functional Pro One in original condition with J-Wire keyboard. The synthesizer is in very good condition both visually and technically. In addition, I am giving a new and not yet installed TM-2 replacement kit (semi-weighted Fatar keyboard with mounting accessories) as well as Potikappen in the Prophet-5 look from the company. Techmechs Vintage Synth.”
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“WORKING CONDITION: Fair- Works about 90%. We cleaned the keyboard and exercised some knobs. Four of the keys are really sticky and tend to stay down when pressed, so they may need some mechanical adjustment. Seems like they’re all mostly engaging though. Some of the controls particularly the filter cutoff are a bit glitchy sounding. In all, this synth will need additional service besides cleaning and maintenance to get it to 100% Currently listed as in fair working condition.

PHYSICAL CONDITION: Very Good – There are some scuffs and dings around the synth. The keys are uneven and probably due for some new bushings, but otherwise, work and feel fine. All buttons, sliders, and knobs intact and ready for action. Overall, the physical condition is very good.

INVENTORY #49146

BRAND: Sequential Circuits

MODEL: Pro One

FUNCTION: Synthesizer

PRODUCT DESCRIPTION: This listing is for a Sequential Circuits Pro One 37-Key Mono Synthesizer

This item was part of Dennis Herrings’ studio production arsenal at his Sweet Tea and DTLA Recording studios.

SPECS:

Serial #9149” Click here to visit listing on eBay

“This needs a lot of work. Some keys trigger while others dont or have some contact issues. A wheel has broken off but can be bought and/or printed. This sale is As-is so treat it like you are purchasing for parts and anything else is a bonus. Turns on without issue. Great project for anyone that wants to replace the bushings, do some key work (def needed) and anything else that comes up.” Click here to visit listing on eBay

“Sequential Circuits Pro One Synthesizer Model 100 Sold AS-IS for restoration. It powers up. I am not familiar with these. I do not know history. I think it is from 1979. I assume the power on/off switch went out so the previous owner hardwired it on. The only way to turn it off on is plug/unplug. One key is higher than others. I opened it up and saw one pin on connector the 16 pin connector was broken off. (see photo) I may have done it opening it up. Those are the only things I noticed. Sold as-is for repairs.” Click here to visit listing on eBay

“This is the J-wire version which Is supposed to be the better of the two. The keys like to double trigger anyways. It takes a bit of work to stay in tune, but hey it’s 40 years old. I made a whole album with this beast. If you wanna listen let me know. It sounds HUGE” Click here to visit listing on eBay

“For sale:

Sequential Circuits – Pro One – Rare Vintage Analogue Synthesizer

Fully serviced by Cyberwave EMS synth restoration in 2022. The synth is in excellent cosmetic condition, perfect working order and plays beautifully. Cyberwave, who have serviced hundreds of Pro Ones, said it was one of the best condition and cleanest Pro Ones they’ve ever seen!

The serial number is #4371 which makes it the most desirable of the Pro Ones produced as it’s the j-wire version (below #8500) which is more stable and easier to repair and also features the non-circuit board mounted power supply (above #1500).

It also comes with a custom flight case that protects and fits the synth perfectly.” Click here to visit listing on eBay

“Sequential Circuits PRO ONE Analog Synthesizer 37 key Keybed And Housing. No synthesizer just the keybed and case in as-is condition. I believe the keys were working before the synth was removed but have no way to check. ” Click here to visit listing on eBay

“Excellent condition for its age. Has been completely gone through recently by a well known record producer / tech savvy. Only played occasionally and covered in the clear plastic cover when not used. Few cosmetic marks/blems as seen in the photos. Everything works as it should. All functions works.” Click here to visit listing on eBay

” Aficionados will recognise this as a relatively early example with the “J-wire” keyboard. Apparently this is easier to repair than the later version.

I have owned this for nearly 40 years and never gigged it. After a long period of non-use I was pleased to find that everything appears to be working, although the keyboard is quite “clicky” and I noticed occasional re-triggering or slurring of notes. So you can have fun with it right away but for serious work I would strongly recommend a service. Cosmetically it is fine apart from traces of marker pen applied by me for security purposes, back when iI was living in a dodgy part of town. See the photos for details. As you will see, all the knobs and switches are present and correct.”
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“I have owned this for nearly 40 years and never gigged it. After a long period of non-use I was pleased to find that everything appears to be working, although the keyboard is quite “clicky” and I noticed occasional re-triggering or slurring of notes. So you can have fun with it right away but for serious work I would strongly recommend a service. Cosmetically it is fine apart from traces of marker pen applied by me for security purposes, back when iI was living in a dodgy part of town. See the photos for details. As you will see, all the knobs and switches are present and correct.” Click here to visit listing on eBay