Sequential Circuits Pro One

“Vintage Sequential Circuits Pro-One analog synth. Recently serviced and fully cleaned by Takeshi at Main Drag Music in Brooklyn. Fully working J-Wire keyboard and several upgraded and restored pots, keyboard bushings and wiring. Unit is in AMAZING sonic, mechanical and cosmetic order and we are reluctant to part with it. We have a Prophet 5 so most of our vintage SCI sound is covered, but this unit takes CV and Clock I/O as well as External Audio, which is a big part of the way we work with synths. You can bring anything into this filter and control the filter CV externally!! Can route tons of modular gear through this and it BLOWS AWAY most of the modular. The keys on this unit are a joy to play and rock solid. The arpeggiator works along with, basically, a legato mode on the keys that plays at the same time, and can be set to either transpose or add notes. It is a great feature and there is tons of tweakability on this synth – which makes it very special and why prices are only going up right now. There is one piece of gaffer tape we put over part of the fuse box, as it is inherently a bit flimsy and having it prevents any issues from fuse popping out for any reason. ” Click here to visit listing on eBay

Sequential Circuits Pro One

“Sequential Circuits Pro-One, J-wire Keyboard, Recently Refurbished. Condition is “Seller refurbished”.

Had the bushings replaced, j-wire keyboard cleaned up, oscillators tuned and the power cord replaced. Everything else just needed to be cleaned off. The only noticeable damage is a few chips and dents in the wood siding.

I would certainly prefer local pickup as it is decently heavy and I would hate for it to be potentially damaged during shipping.” Click here to visit listing on eBay

Sequential Circuits Pro One

” Vintage Sequential Circuits Pro-One analog synth. Recently serviced and fully cleaned by Takeshi at Main Drag Music in Brooklyn. Fully working J-Wire keyboard and several upgraded and restored pots, keyboard bushings and wiring. Unit is in AMAZING sonic, mechanical and cosmetic order and we are reluctant to part with it. We have a Prophet 5 so most of our vintage SCI sound is covered, but this unit takes CV and Clock I/O as well as External Audio, which is a big part of the way we work with synths. You can bring anything into this filter and control the filter CV externally!! Can route tons of modular gear through this and it BLOWS AWAY most of the modular. The keys on this unit are a joy to play and rock solid. The arpeggiator works along with, basically, a legato mode on the keys that plays at the same time, and can be set to either transpose or add notes. It is a great feature and there is tons of tweakability on this synth – which makes it very special and why prices are only going up right now. There is one piece of gaffer tape we put over part of the fuse box, as it is inherently a bit flimsy and having it prevents any issues from fuse popping out for any reason. ” Click here to visit listing on eBay

Sequential Circuits Pro One

“Sequential Circuits Pro One Synth

Serial # 649. Original, not revision.

Serviced:

J-Wire Keybed, all new bushings, Keys and wires aligned…

New internal power connector, new ribbon cable
New high end Panasonic electrolytics
all switches and pots meticulously rinsed/cleaned/conditioned/sealed/lubed
PCB cleaned with 99.9% isopropyl
tuned and calibrated” Click here to visit listing on eBay

Sequential Circuits Pro One

“I am the original owner of this Pro-One. It’s in excellent condition. I had SynHouse MIDI installed in the late 90s. It has The more reliable & preferred 37-note J-wire style keyboard. Recently is was serviced/refurbished by vintage synth repair specialist John Paul Bohon of Double Heart Audio in Austin. You can see more of his work at SwitchedOn vintage synth shop in Austin. The synth and the MIDI work perfectly. The synth comes with its original user’s manual and SynHouse MIDI manual. Also included is a receipt for the recent work done.

The last picture is a picture of the holes above the pitch and mod wheels. In the left hole, just below the surface is a MIDI tuning slot. The right hole is a small button. It resets and changes the MIDI receiving channel. MIDI functionality is explained in the included Synhouse manual. They were installed with the MIDI installation.

The work done recently is listed on the receipt in the pictures. It includes repair MIDI functionality, replace the MIDI jack (I had a cleaner looking jack installed), replace/lubricate all keyboard bushings, repair four non-functioning keys.

Feel free to message me if you have any questions.” Click here to visit listing on eBay

Sequential Circuits Pro-One

“Synth was used by original owner (whom I am selling on behalf of) until the 90s and then stored until being brought out to test earlier this year. This synth has been used is 8/10 cosmetically. The serial number is 3898 meaning it has the more stable J wire keyboard rather than the later membrane type.

Recently repaired power supply and one broken key by Audio Circus, I have invoices showing this. While this synth does work well, it could do with a little more work to get this to factory spec. Those works have been recommended by Audio Circus. Keyboard re-bushing and pots cleaning, I have the quote for this work and I can arrange to get this done (buyer pays) if the buyer requires. This could be done before they receive the synth. It is essential you ask me about this. ” Click here to visit listing on eBay

Sequential Circuits Pro One

“If you’re unfamiliar with this synth, it’s essentially a single voice version of the popular Prophet 5.

Just serviced by my tech, except I did not have him service the keyboard. The keyboard works, but could use rebushing or one of those Fatar drop-in replacement keyboards. Has two reproduction knobs.

This specimen is in pretty good condition for being around 40 years old. See photos of minor blemishes.” Click here to visit listing on eBay

Sequential Circuits Pro One

“Sequential Circuits Pro One. Needs a good home. Condition is Used. This is a very special synth and is in full working condition with a few minor cosmetic flaws.There are so many things that make this synth special. These two Curtis 3340 VCOs (that so many modern analogue synthesizers have tried to replicate) allow for thicker bass notes and richer, more colorful, piano like Mids. The modulation matrix is capable of adding even more to the Pro One’s sound including countless timbral possibilities through FM synthesis, up to two LFOs, and a filter envelope that can also modulate pulse width and oscillator frequency as well. The Pro One also has an additional VCA envelope, and both envelopes have a re-trigger mode. Oscillator B can serve as an LFO or audio rate modulation source, and can generate frequencies independent of the keyboard. It has a sequencer and arpeggiator as well. The serial number for this unit is right in the sweet spot where Pro Ones had good power supplies and keys. That said even the better of the two key beds will need to be occasionally serviced. These keys have recently been serviced and none stick currently. They will begin to stick over time though, and the key bed will need to be routinely cleaned. The keys are just a bit stiff, as is the nature of all Pro Ones.” Click here to visit listing on eBay

Sequential Circuits Pro One

” This is a Pro One analog monophonic synthesizer Packed with features and a ton of modulation routings. This keyboard has the earlier, more reliable J wire keyboard. It is in good working condition. I’ve owned and used this keyboard for many years, always keeping it in my home studio. I was disappointed to find that after a recent move, one sliding switch was knocked off. Although moveable with a pen, the switch should be replaced. This part is still available from Wine Country Productions for under $10. This damage is shown in one of the photos. Because of this damage, I am offering this synth for less than it is worth. Although I have tested and confirmed that all features and functions work, it is sold AS IS. This synth is about 37 years old and these synths do occasionally need service although the Pro Ones are some the most reliable synths I’ve owned. ” Click here to visit listing on eBay

Sequential Circuits Pro-One

“The original Pro-One monophonic synthesizer from 1981. Please refer to online reviews of this legendary instrument for detailed technical specifications. Suffice to say this is a classic analogue synth with extensive modulation capabilities, powerful filter with the SCI unique resonance, two oscillators, sequencer and arpeggiator. There is only one Pro-One in terms of build and sound quality; naming no names, recent clones are decent enough machines but simply that: machines rather than instruments. It was mostly triggered by a MIDI converter box rather than played direct during its working life, so the keyboard is responsive and without the triggering problems which some examples exhibit. There are slight though noticeable abrasions on the right-hand wooden sides (see photos) but otherwise it’s in a fine condition.

The Pro-One sound can be heard on recordings by artists as diverse as Vince Clarke, Michael Jackson, John Carpenter, and many others. It’s an absolute beast if you’re producing Techno or House.

This example has been kept carefully in storage since the early 1990s and has recently undergone an extensive service and overhaul by the Synthesizer Service Centre, London NW10 (invoice document included).

Serial number: 100-6999” Click here to visit listing on eBay

Sequential Circuits Pro One

“Very good condition and comes with Turbo CPU/MIDI, plus a top of the line Fatar keybed installed. this work costed around £450 just for the parts and so the synth is priced higher than the usual selling price to account for these highly functional upgrades.

The synth sounds perfect and was serviced when the MIDI and keybed upgrades were installed.

The Turbo upgrade gives full MIDI in and out functionality, as well as a number of other extended functions compared to the original.

The Fatar keybed replaces the often dodgy original keys with a top of the range set, the same as is used by manufacturers of new premium synths.

Note that this is a vintage piece of gear and as such does show expected signs of age cosmetically.” Click here to visit listing on eBay

Sequential Circuits Pro One

“The Good: This vintage Pro One is in very nice shape and comes securely packed in a heavy duty keyboard case. I’ve owned this for about 20 years, and it’s spent much of the time inside the case, so it’s in nearly the same great condition as when I bought it. No sticky knobs or dents, the end wooden pieces look nice, and it comes with the original manual. There are a couple of small scratches on the underside.

The Bad: Though this is the preferred j-wire version of the keyboard, it does have an issue with repeating notes. Sometimes when you push down on a key, it triggers the note twice, and programming sequences confirms that is happening. It may be something simple to fix, like adjusting the j-wires, but after opening it up and seeing nothing obvious wrong, I decided not to mess with it. Personally, if I were keeping this I’d just replace it with this much better keyboard: https://techsmechsvintagesynth.com/home/tm-2-pro-one-keyboard-replacement-kit.html.

The Odd: You’ll notice a switch above the pitch wheel; this was a mod done by the prior owner, and I don’t even recall what they said the point was. As far as I can tell this just changes the pitch by one note, which could be used to slightly alter arpeggios or sequences. I’ve also included a photo of the board so you can see where it’s wired.

The other abnormality of this unit is the knobs; most of them were replaced with Moog knobs, which are bigger and much better I feel. Unfortunately I can only find 6 of the old original knobs, but I truly feel you’ll prefer the replacements. There are also a couple of CEM chips that came with it that I’ll also include, but I have no idea if they work or what they’re for, though I assume they’re filters.” Click here to visit listing on eBay

Sequential Circuits Pro One

“Sequential Circuits Pro One J-Wire Vintage Analog Mono Synthesizer Synthesizer in excellent condition. This is an amazing sounding vintage synth with two oscillators with cross mod sync. It also has a built-in sequencer. Very flexible modulation matrix. J-wire keyboard for easy cleaning, and they don’t wear out like the newer rubber keycap designs. All controls, functions, and keys work flawlessly. You won’t find one in better condition – it’s almost like new! ” Click here to visit listing on eBay

Sequential Circuits Pro One

“Super clean, unmolested/unmodified original Sequencial Circuits Pro One model 100 !
This is the real deal, Vintage and powerful SCI PRO ONE! Not a modern day clone made from Chinese parts.
Made in the USA in San Jose, California.
Only 7,000 Version 2 Pro One’s were ever made total!

*** Fully restored and serviced! (details below) ***

This is the very much more desirable “J Wire” version 2 of the Pro One.
SERIAL # 7689″ Click here to visit listing on eBay

Sequential Circuits Pro One

“The original Pro-One monophonic synthesizer from 1981. Please refer to online reviews of this legendary instrument for detailed technical specifications. Suffice to say this is a classic analogue synth with extensive modulation capabilities, powerful filter with the SCI unique resonance, two oscillators, sequencer and arpeggiator. There is only one Pro-One in terms of build and sound quality; naming no names, recent clones are decent enough machines but simply that: machines rather than instruments. It was mostly triggered by a MIDI converter box rather than played direct during its working life, so the keyboard is responsive and without the triggering problems which some examples exhibit. There are slight though noticeable abrasions on the right-hand wooden sides (see photos) but otherwise it’s in a fine condition.” Click here to visit listing on eBay

Sequential Circuits Pro One

“The original Pro-One monophonic synthesizer from 1981. Please refer to online reviews of this legendary instrument for detailed technical specifications. Suffice to say this is a classic analogue synth with extensive modulation capabilities, powerful filter with the SCI unique resonance, two oscillators, sequencer and arpeggiator. There is only one Pro-One in terms of build and sound quality; naming no names, recent clones are decent enough machines but simply that: machines rather than instruments. Sure, the keyboard, or rather, keybed, is notoriously flakey, but not on this example. It was mostly triggered by a MIDI converter box rather than played direct during its working life. There are slight though noticeable abrasions on the right-hand wooden sides (see photos) but otherwise it’s in a fine condition.” Click here to visit listing on eBay