Sequential Circuits Pro-One

“Something very special. Fully customised Pro-One, featuring the following:

– Fully custom walnut casing 

– Kenton midi kit 

– Brand new fentar keyboard 

– Pro 5 pot and button upgrade

– Fully serviced 

All of these upgrades cost well over £1,000. What you’ve got is an absolute classic updated for the modern producer and looking gorgeous.

I will guarantee the item against functional defects for 3 months. Due to nature of the item I will only repair any defects subject to fair use.” Click here to visit listing on eBay

Sequential Circuits Pro One

” 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 Prophet 2000

” Sequential Circuits Prophet 2000 Keyboard Sampler

Reluctantly selling my Prophet 2K, the classic 80’s sampler that along with the Ensoniq Mirage ushered in semi-affordable studio-grade sampling for a much broader range of musicians, and helped give birth to House Music, and Electronic music as we know it. Serviced a year ago (I’ll include the receipt, £160 spent with a top tech) and not used much since, I just don’t have the space to set it up these days, so it’s annoying my wife in the spare room. Almost worth keeping for that reason only but best to try to score some brownie points before Christmas.

It’s fitted with the excellent 2x Memory Expansion by Synthechnics (cam reform Portugal, another £100 or so), which is a modern reliable clone of the original SCi one. Membrane buttons, wheels, dials and all keys work great, with display bright and clear. In fact the tech thought that the tact switches under the membrane may all have been replaced at some point pre-me, which is a handy bit of future proofing I didn’t realise (although they always felt surprisingly good). Quite a few age-related marks and scratches here and there on the bodywork, and that’s just a bit of old tape residue on the back corner that may well come off with a bit of perseverance, but no scary damage, just a nice honest example. It comes with the UK power lead, plus the original Operation Manual, which is a rare thing, a chunky ring-binder file. Latest/last OS version chip installed too.

These are coming up for sale less and less often, partly due I’m sure to videos by Espen Kraft and others showing what these are capable of, and what they can add in a modern studio setting. So a serviced one with memory expansion and the original manual file is a rarity. I can’t see another P2K available either on reverb or on here right now in the UK, or anywhere in the world for that matter.” Click here to visit listing on eBay

Sequential Circuits Pro One

“model # 100, serial # 2330

This Pro One is in perfect working condition. It was calibrated and it’s J-Wire keyboard was rebuilt several years ago. I bought this synth in 1990 when people were dumping analogue synths. Since that time it has been taken very good care of. When not in use it is always covered. This Pro One is missing two of its four rubber feet. This unit was in a stand so it was never an issue for me. I am selling this unit to fund purchasing some eurorack synths. I own another Pro One I bought in 1981 and a newer Behringer Pro One. ” Click here to visit listing on eBay

Sequential Circuits Pro One

“This Pro One is in perfect working condition. It was calibrated and it’s J-Wire keyboard was rebuilt several years ago. I bought this synth in 1990 when people were dumping analogue synths. Since that time it has been taken very good care of. When not in use it is always covered. This Pro One is missing two of its four rubber feet. This unit was in a stand so it was never an issue for me. I am selling this unit to fund purchasing some eurorack synths. I own another Pro One I bought in 1981 and a newer Behringer Pro One. ”
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Sequential Circuits Pro One Project Machine

“Vintage Sequential Circuits Pro One Synthesizer. Unsure if item works therefore selling as is. May or may night work or need repair. Vintage 1980s synthesizer.

UPDATE 8/28/22

Been getting alot of questions so I took more pictures. This is my Pro one. Bought it new in the 80s at Sam Ash in Queens NY. Used it a few years at home only. It has been unused for over 30 years in storage at different locations. When I used it, it always worked. Looks like the fuse has fallen out and I don’t have another or know when it was lost. I’m assuming that’s all it needs but not sure” Click here to visit listing on eBay

Sequential Circuits Pro One

“Sequential Circuits pro one.

I bought this fantastic sounding mono synth about 20 years ago second hand.

The power cord is somewhat frayed where it meets the machine, but this causes no problems as yet in turning on the machine.

Also, the keyboard has some dust in it meaning that sometimes, if pressed hard some of the inputs on some keys stutter, due to the electrical connection.”

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Sequential Circuits Pro One

” This massive sounding classic analog beast was born August 1981 : ) As you can see it was very well cared for, it looks fantastic and it all works great! By far the best bass and lead machine. It even sounds a little bolder than the Prophet 5! I had a pro analog tech install new key bushings and give it a good once over. This synth plays, sounds and looks great! Nothing beats the classics!
I left a radio station sticker on the side left panel.. you can easily remove it if you wish.. i just kept in on there as it really reminds me of how awesome the 80’s were. BTW, this is an early serial J Wire edition.. not the problematic Membrane Keybed version which has issues.. happy happy!”
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Sequential Circuits Pro One

“Sequential Circuits Pro One Vintage Synthesizer.
This classic synth is renowned for its fat rich bass synthesis and much more,
The filter system has been copied by many but bettered by none.
The inclusion of an audio input gives the user access to the awesome filter
to process external sounds.
This synth was professionally serviced 6 months ago and is in great condition
there is a very occasional crackle from a pot and a rare miss fire from a key
but all these parts are still original and work exceptionally well for their age”
Click here to visit listing on eBay

Sequential Circuits Pro One

“The famous Sequential Circuits Pro One mono synth.

A classy 2 oscillator machine with a fabulous rich, deep, punchy, awesome sound.
In very good condition, not Mint, not Excellent, but certainly ‘very good’. Early J-wire model.
Set 220 volts (can be set to 110).

Sold as seen. One key has a previous glue repair on it as you can see in the pics but all keys working fine.” Click here to visit listing on eBay

Sequential Circuits Pro One

“Legendary analogue synthesizer from 1981. Without a shadow of doubt the most powerful mono synth ever produced. This thing is completely devastating for bass, but also excels at leads, drones, percussive sounds and all kinds of other complete madness. A truly wild and amazing instrument. The real deal – none of this modern clone/reproduction business. The synth was serviced a couple pf years ago and is working flawlessly (I can provide the service invoice). The synth is in immaculate condition cosmetically. High quality walnut end cheeks have been added, these were imported from the USA and were costly items alone. All in all for a 40 year old unit this is a really incredible example. An amazing and inspiring instrument but also a solid investment, the price of these things is rising all the time these days. Collection in person is ideal – but I’m happy to ship within the UK at buyers expense.”
Click here to visit listing on eBay

Sequential Circuits Pro One

“This one is in excellent cosmetic condition and working 100%. It is ready to be played and needs nothing! As the title says, this one has the Turbo CPU Upgrade with Midi. It has a custom midi bezel on one of the wood sides so there is no irreversible damage and misaligned holes drilled into the metal housing. It also has the Techsmechs TM-2 keyboard replacement. Please mail with any questions. Shipping to most countries! The shipping price listed is just an estimate. If it is less, you will be refunded. If you’re overseas, it may be more. Please keep this in mind. ” Click here to visit listing on eBay

Sequential Circuits Pro One

“This one is in excellent cosmetic condition and working 100%. It is ready to be played and needs nothing! As the title says, this one has the Turbo CPU Upgrade with Midi. It has a custom midi bezel on one of the wood sides so there is no irreversible damage and misaligned holes drilled into the metal housing. It also has the Techsmechs TM-2 keyboard replacement.” Click here to visit listing on eBay