sci pro _one “This is an original Pro One with a 37-note J-wire style keyboard. I have installed new Pratt & Read rubber bushings for the keys, and have kept this synth stored in my closet for the past 12 years. I also recapped the power supply and reflowed all the solder joints when I acquired the keyboard for my personal home studio. The previous owner drilled two holes in the case (see photos) for reasons I never understood. It never really bothered me, but could be a perfect location for MIDI in/out should you choose to go down that path.

I have just tested all keys, knobs, switches and both pitch wheels with my headphones, and all work great! Also included are the original operating and technical manuals. Both have been written in (original owner again), but are otherwise in fine shape.” Link

sci pro one “Excellent condition. J Wite edition. Recently professionally calibrated. All knobs, keys, switches work perfectly. Selling with the Kenton Pro Solo ii CV to MIDI converter. Due to the age of the instrument, it is being sold as is. ”
Link

Pro One, Sequential Circuits @ 09 February 2017, Comments Off

usedpro_opne “For sale is my Sequential Circuits Pro One vintage analog synthesizer. This has the more desirable J-wire keyboard (serial number #100-3142). It’s in nice shape and working great. The only thing not working is the Noise knob in the mixer section. Everythign else is working, but in general it could use a servicing/tune-up. All the keys do trigger currently but the keyboard is clacky, so a rebushing would make it play smoothly. Some of the switches are dirty and knobs are scratchy. Otherwise it looks to be working as it should, and has a great sound. The Pro One is almost like a monophonic Prophet 5 but with a few extra features like the sequencer, arpeggiator and mod section.” Link

Pro One, Sequential Circuits @ 02 February 2017, Comments Off

up1 “Selling my beloved Sequential Circuits Pro One to free up room in my studio. The synth has been recently tuned by a reputable technician. Due to the nature of vintage instruments, the synth is sold as-is, no returns accepted.

Issues:
1. This unit features the membrane keyboard (this is not a J-Wire model). These keyboards all trigger pretty unreliably, so I recommend you play the synth via CV/Gate.
2. The key bushings need to be replaced. I have a new set I will include with the synth (pretty simple procedure to replace them). Doesn’t make a difference if you’re playing over CV/Gate due to the issues with the membrane keyboard, however.
3. Tuning is a bit flat when playing via CV (but tracks correctly across the full range). Not really a problem per se, just adjust the osc tuning accordingly.” Link

Pro One, Sequential Circuits @ 02 February 2017, Comments Off

sci_pro_one “This J-wire Pro One was serviced on 11-30-16 by Greg Montalbano via Music Technologies Group.

Routine service included pots, switches and key contacts cleaned, bypass caps were replaced, and the synth was tuned & scaled. Furthermore an IEC Power Connector was installed, Key Bushings were replaced, and the MTG MIDI Mod was installed (Midi In, Out and Thru)!

The serial number is 4566.” Link

Pro One, Sequential Circuits @ 26 January 2017, Comments Off

por-one “This Pro One is one of the first 1000 made(677). It is in VG cosmetic condition and sounds outstanding. The outputs and potentiometers are static free and turn smoothly.

One key has lost its bushing and sits a little higher in the key-bed than the others. It is a little loose upon being struck and wiggles a tad. The key does still work. The bushing costs a few bucks at Wine Country.

Owners manual and Service manual are included in a binder.

I have described this item to the best of my ability and therefore cannot offer returns on this item.” Link

Pro One, Sequential Circuits @ 19 January 2017, Comments Off

sciproone ” This Sequential Circuits Pro-One is in amazing condition and fully functional, and is Midi-Capable via INCLUDED Vesta Kozo Midi-CV converter. It is a fully and professionally restored Late-Model with fully-functioning Keyboard. This is all-original, with NO modified circuitry or re-soldered components. All rotary pots and switches have been professionally cleaned. All key contacts on this later non-J-wire model have been restored and functioning. Everything works and sounds great. While no vintage synth is ever “truly” mint or perfect, this one has been well cared for and not cosmetically re-finished. Incredibly clean unit inside and out. Original Power cord (does not use AC wall adapter).” Link

Pro One, Sequential Circuits @ 19 January 2017, Comments Off

p1 “Ich gabauf meine Tonstudio zu tun !Die Synthesizer ist wie neu. Benutzt in einem nicht raucher Recording Studio”
Link

Pro One, Sequential Circuits @ 19 January 2017, Comments Off

pro1 “This Pro One is one of the first 1000 made. It is in VG cosmetic condition and sounds outstanding. The output and potentiometers are static free and turn smoothly.

One key has lost its bushing and sits a little higher in the key-bed than the others. It is a little loose upon being struck and wiggles a tad, however, it does still trigger and work fine. I never found the need to fix the key because of how little I played it and the way I played it. The bushing is a few bucks at Wine Country.

Owners manual and Service manual are included in a binder.” Link

Pro One, Sequential Circuits @ 12 January 2017, Comments Off

sci1 “Sequential Circuits Pro One Synthesizer Model 100. 26 inch by 16 inch spare or repair. No external damage { Postage to UK ONLY} . Case included but the foam inside it is perished.” Link

Pro One, Sequential Circuits @ 12 January 2017, Comments Off

1 “This is the original Sequential Circuits Pro One, serial #5510, with the preferred J-wire key action. All the knobs and switches have been de-oxidized and run as smooth as silk. Each key’s J-wire connections have also been carefully cleaned and de-oxidized and work perfectly. There is on key, the second C key from the bottom, that is still a little scratchy if the key is released slowly, but works perfectly in normal playing conditions. The orginal key bushings have all been cleaned and all the keys are even.

This comes with, and will be shipped in, a perfectly fitting Pelican 1650 case with wheels and is perfect for storing the insturments or taking it out on gigs. I purchased this instrument in 1993 and am the second owner. Since then it has been in my smoke-free studio or in temperature controlled storage. I have just given it a thorough cleaning and it works and sounds totally great.

As with all of these vintage Pro Ones, there are a good number of ways to interface it with other analog voltage controlled devices, including all the modern modular Eurorack gear (with a simple 1/4’ to 1/8” adaptor). There is basic CV in and out, gate out, gate/clock in, and filter CV in. There is also an audio in plug so you can send external audio through the Pro One’s great sounding filter. As I’m sure you know since you are here, this is a monophonic instrument but it does have a very cool appreciator and a very basic, but still cool, two position sequencer. This is basically the (one voice) little brother of the Prophet 5. (Thus the “Pro One” name.)” Link

Pro One, Sequential Circuits @ 29 December 2016, Comments Off

p1 ” I really hate to sell such a cherished musical instrument; None the less, I’m not using it and can’t see a vision of when I will. The time has finally come when more important things/people are needing my concern.

This Pro One is one of the first 1000 made. It is in excellent cosmetic condition and sounds outstanding. The output and potentiometers are static free and turn smoothly.

One key has lost its bushing and sits a little higher in the key-bed than the others. It is a little loose upon being struck, however, it does still trigger and work fine. I never found the need to fix the key because of how little I played it, and the way I played it. If someone wanted to open it up and fix it I’m sure it’s not too difficult. The bushing is a few bucks at Wine Country. ” Link

Pro One, Sequential Circuits @ 29 December 2016, Comments Off

pro_one “Great synth in good condition for its age. Some potentiometers needs replacing and a just overall tuneup. Far left key needs replacing. This is j wire model. ” Link

Pro One, Sequential Circuits @ 15 December 2016, Comments Off

pro “Parting ways with another one of my favorite pieces of gear, my Sequential Circuits Pro-One. It was purchased at Dr Sound in NYC in 98 after a full servicing. It also had a mod & pitch wheel modification (replaced with knobs). I just opened it up and cleaned her out. She is in perfect working order. All keys work, sequencer etc. Entire machine was blown out with pressurized air, keys were cleaned. J-bar and bus bar cleaned and even touched up the wood with a light application of Murphy’s. ” Link

Pro One, Sequential Circuits @ 15 December 2016, Comments Off

p1 “This is an original Pro One with a 37-note J-wire style keyboard. I have installed new Pratt & Read rubber bushings for the keys, and have kept this synth stored in my closet for the past 12 years. I also recapped the power supply and reflowed all the solder joints when I acquired the keyboard for my personal home studio. The previous owner drilled two holes in the case (see photos) for reasons I never understood. It never really bothered me, but could be a perfect location for MIDI in/out should you choose to go down that path.

I have just tested all keys, knobs, switches and both pitch wheels with my headphones, and all work great! Also included are the original operating and technical manuals. Both have been written in (original owner again), but are otherwise in fine shape.” Link

Pro One, Sequential Circuits @ 15 December 2016, Comments Off

usedscip31 “This vintage synth is in great condition, beautiful walnut end panels, plays well and is ready for new studio or home after 35 yrs. of being mostly stored in its hardshell case. New power cable installed recently. Some notable imperfections are high/e key scratch and scrapes on bottom (see photos). Includes case and original owners manual. ” Link

Pro One, Sequential Circuits @ 08 December 2016, Comments Off

pro_one “For sale is my SCI Pro One synthesizer. This is a rare synth going up in value all the time…that’s because it sounds awesome! Huge bass, leads, effects, with cool cross mod section that only a Pro One has. Similar to the P5 but has it’s own unique sound. This Pro One is fully functional & in excellent cosmetic condition for it’s age, J-wire keyboard and has the MTG Turbo CPU & MIDI retrofit fitted which turns it into a beast and integrates perfectly with any computer / midi based set-up. Really nice clean shape on the front, overall quite clean. Don’t miss out on this monophonic analog classic!” Link

Pro One, Sequential Circuits @ 08 December 2016, Comments Off

sci_pro_one “This vintage synth is in great condition, plays well and is ready for new studio or home after 35 yrs. of being mostly stored in its hardshell case. New power cable installed recently. Includes case and original owners manual.” Link

Pro One, Sequential Circuits @ 08 December 2016, Comments Off

sci_pro_1 “Background on the product: It was purchased new by a Jr. High school in the 90′s for use as a bass unit for the band. It came to our tech shop shortly after with a damaged membrane keyboard and split wood sides due to a basketball landing on the keyboard. Parts were too costly at the time so the unit was scrapped and sat on a shelf for the last 20 years. I recently decided to bring it to life so here is what has been done:
A retro fitted J-wire keyboard taken from a sound chaser 90′s music system (pratt and reed J wire) with all new bushings and an original PCB from a pro one hand wired and soldered into place to maintain DIP socket connectivity from a ribbon cable. New plastic bushing and repair on AC cord. New fuse system. New Black Walnut Wood sides with 4 coats of urethane. New noise generator (hand picked from a bucket of them for the noisiest one). New Logo badges. lightly sanded and re painted bottom, and VCO calibration. It cosmetically looks awesome.
What does not work is the arpeggiator/sequencer which uses an 8021 obsolete chip. I have not confirmed the chip is bad however. If that is important, a retrofit (and superior) sequencer with MIDI is available on eBay. Some pots are scratchy from the long years of sit, but it was always stored inside. Action on the keyboard is GREAT! Welcome back Pro-One for use once again!” Link

Pro One, Sequential Circuits @ 01 December 2016, Comments Off

sci_pro_one “Great working condition. Very clean. Low serial number early model. Good cosmetic condition with some light blemishes. Has some scratches in the finish on the bottom consistent with wear from being used on a stand. It also has some light scuffing on some the keys which didn’t show up in the pictures. Other than that it is in great shape.

Recent professional service. All panel switches and potentiometer controls cleaned. All J-wire key contacts and buss bars cleaned. New keyboard bushings. Power supply recap. Complete calibration. Absolutely fantastic playing condition. Great vintage synthesizer.” Link

Pro One, Sequential Circuits @ 25 November 2016, Comments Off

pro_one “Vintage Sequential Circuits Pro One Synthesizer in superb condition with no damage. Been tested. This has been a home system and hardly used. Model 100.” Link

Pro One, Sequential Circuits @ 17 November 2016, Comments Off

sci_pro_one “Selling a pro one audio sequential synthesizer in good working condition very clean comes with manual ” Link

Pro One, Sequential Circuits @ 03 November 2016, Comments Off

uesd_pro_one “In excellent condition. Recently serviced by The Analog Lab. This is one of only 10,000 synthesizers made by Sequential Circuits.”
Link

Pro One, Sequential Circuits @ 03 November 2016, Comments Off

usd “I have had this since the early 80′s. It’s been on the road and in a studio. It has been thoroughly cleaned and all switches and pots have been cleaned with Deoxit. It has the j-wire keyboard. Everything works, and it sounds great! It could probably use new key bushings, but all the keys work fine. I have only one of the wood pieces for it, the other has been lost. ”
Link

Pro One, Sequential Circuits @ 03 November 2016, Comments Off

o1 ” This keyboard was my brothers. He bought it new in the early 80′s and it’s been sitting alone in the attic for years. DOES NOT WORK. It comes as shown in photos. Sold as is. Missing an attack knob.

It’s one of the first 1000 off the production line.

I do not have box or manuals for the synthesizer.” Link

Pro One, Sequential Circuits @ 03 November 2016, Comments Off

sci_pro_one “This auction is for one vintage used 1981 Sequential Circuits Pro One analog synthesizer keyboard project. I purchased this keyboard several years ago and intended to restore it but I never got around to it. This keyboard powers up and is working. Only half of the keys are working and they are all stiff. The pots and switches could stand to be cleaned. This synth has been in storage for a long time. With that being said, this keyboard is being sold “as-is” for parts or repair. Cosmetically, the keyboard shows wear including scratches and some dings on the wood sides but still looks nice overall (see pictures). The “AMOUNT” knob under the modulation section is missing (see pictures). The plastic shaft is still there and the pot works fine. This auction is for the Pro One keyboard only and original Viking ATA flight case only. The ATA case needs to be re-foamed.” Link

Pro One, Sequential Circuits @ 03 November 2016, Comments Off

p1 “Classic synth” Link

Pro One, Sequential Circuits @ 27 October 2016, Comments Off

sci_p1 ” I am the original owner of this Sequential Circuits Pro One vintage synthesizer, serial number 2064. I purchased it from Guitar Center Hollywood in August, 1981. The power transformer is case-mounted and the keyboard is the J-wire type. It has spent its entire life in my home recording studio and is in excellent condition as you can see in the photos.

If you’re not familiar with the Pro One, its sound generation is 100% analog. The keyboard inputs are digital as are its onboard sequencer and arpeggiator. It has versatile modulation routing and is outrageously fun to play with.

I did the following to prepare it for sale:

1. Cleaned it thoroughly inside and out.

2. Sprayed all the pots, slide switches and jacks with Deoxit, and verified that they operated smoothly and quietly.

3. Replaced the two rotary octave switches with new ones. The originals felt stiff and can’t be sprayed because they are sealed. The new switches are identical to the old ones.

4. Replaced the original power cord with a new one of the same ratings and length.

5. Replaced the two main power supply capacitors with new Nichicon 2200uF @50v audio equipment grade caps.

6. Cleaned the keyboard bus-bar and J-wires with tech grade (99.9%) isopropyl alcohol and cotton swabs.

7. Installed new keyboard bushings on all keys.

8. Leveled all the key tops.

9. Made some minor J-wire adjustments to even out key firing depth.

10. Tuned the oscillators and the amp balance circuit according to the procedures published by Sequential Circuits.

Notes:

1. Everything in this synthesizer is original unless mentioned in the list above. It has never had any repairs prior to this and there haven’t been any cosmetic fixes of any kind.

2. There is a small (1/4″) hole drilled below the Audio Out jack on the back panel.This was intended to be used to bring out the digital interface that I never actually got around to implementing. The hole is plugged with a removable plastic plug that you can see in the pics.

3. There is a hairline crack in the volume wheel, which you can see in the pics. It doesn’t affect the functionality, but of course it is vulnerable. It can be opened wide enough to fill with glue, which I suspect would make it as strong as new, but I decided to leave any repair options to the next owner.

4. The bus-bar looks very good. There is some visible wear on some of the J-wires where they contact the bus-bar. Though it’s pretty easy to bend the J-wires so that a new surface is presented to the bus-bar, I again opted to leave all options open to the next owner, if it becomes necessary. As of now, all keys are firing consistently and cleanly.

All synthesizer functionality is working properly.” Link

Pro One, Sequential Circuits @ 27 October 2016, Comments Off

usedsciproone “I got this synthesizer at an estate sale. It is in good cosmetic condition and it seems to be playing fine. I tested it with a pair of headphones and I get sound from every key and every button changed the tone of the sound that came through the headphones. I am no expert but it seems to me that it works great.” Link

Pro One, Sequential Circuits @ 27 October 2016, Comments Off

iusedp1 “This Vintage Sequential Circuits Pro One synth is in great working condition, and still shakes the house! It’s been taken care of over the years. Basically a studio instrument. Good cosmetics with some light blemishes. Refer to pics.The only thing worth mentioning is a couple keys that might need a slight adjustment. Kinda sticky at first, but seem to level out after playing for a bit. New rubber key bushings installed. Extra included. The wood panels are nice, no dents or scratches. All panel switches and potentiometer controls have been cleaned.” Link

Pro One, Sequential Circuits @ 13 October 2016, Comments Off

pro-one “This one is in very good cosmetic condition and working 100%. It has just been serviced and with some restoration. It has the Turbo CPU + Midi & has the J-wire keyboard. It is ready to be played and needs nothing!” Link

Pro One, Sequential Circuits @ 06 October 2016, Comments Off

used-pro-one “Vintage Sequential Circuits Pro One Analog Synthesizer ☆ ☆ Great Condition! ☆ ☆

This synthesizer is pre owned – it has been tested – and it is in great working condition & great physical condition!!

Serial number is very low and It was made 11/7/1982

It comes as shown in photos. I do not have box or manuals for the synthesizer. Just the power cord is being sold with the synthesizer.

It has very few signs of use and in good condition for it’s age. Original owner took great care of this synthesizer.” Link

Pro One, Sequential Circuits @ 06 October 2016, Comments Off

used-pro_one “I got this synthesizer at an estate sale. It is in good cosmetic condition and it seems to be playing fine. I tested it with a pair of headphones and I get sound from every key and every button changed the tone of the sound that came through the headphones. I am no expert but it seems to me that it works great.” Link

Pro One, Sequential Circuits @ 29 September 2016, Comments Off

usedp1 “Sequential Circuits Pro One (J-Wire) in fantastic condition for its age. Some slight scuffs to the wooden panels, and small scratch to the logo – as pictured.

If your looking at this you know how awesome this thing is. Serviced a 1/2 years ago. It’s Sounds huge!

Sad to see it go but needs must and need to make space. ” Link

Pro One, Sequential Circuits @ 29 September 2016, Comments Off

p1 “As is. Missing Fuse and Fuse Cap. Does not turn on. One Knob is broken off and needs to be replaced, but auction does include the knob cap for it. Another knob seems kind of loose when you turn it. The rest of the knobs seem fine. Missing drone on/off switch. Does not have wood panels. There’s electrical tape around the base of the plug and a small amount of some kind of dry residue in that corner, probably from tape, in the area around where the fuse cap would go. There’s a fair amount of scratching on the unit, especially on the bottom. The rest of the scratches are less apparent, but it’s far from pristine. Serial number is 1966 which means it’s a j-wire. The mechanism of the keys work properly but many are slightly uneven. The mod and pitch bend wheels seem fine. All of the other switches move up and down properly. The power switch also seems fine.” Link