“The Prophet 600 was the first commercially available MIDI equipped synth (1981).

I recently took out the key contacts and cleaned them (this is a commonly needed procedure for these). The keys are perfectly straight and the action is nice and even from key to key.

The memory works perfectly.

This unit has not been modified in any way.

These sound amazing. They can be extremely aggressive and biting. The cross mod capabilities are very nice.

I wish I didn’t have to sell it.” Click here to visit listing on eBay

“Looks in great shape plays nice comes with shipping box see in pictures” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 04 April 2019, Comments Off on Sequential Circuits Prophet 600

“SCi Prophet-600 programmable polyphonic synthesizer

Looks 9.25 of 10
In very clean condition, please see pictures.

Works 10 of 10
Everything works as specified, overhauled before shipping to have long life and to keep original sounds.
Change all electrolytic capacitors and short life transistors, opamps and logis ICs with new ones,
and keys knobs, sliders, switches and jacks cleaning before shipping.

Brand new switch panel installed.
gligli firmware installed (on buyer’s request).” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 07 March 2019, Comments Off on Sequential Circuits Prophet 600

“These units are in excellent condition with minor scratches and general wear as pictured.

Tested and working perfectly and having had a thorough test prior to listing.

* If you need to use this item in a 220-240v environment we sell high quality Nissyo branded made in Japan compact transformers which will allow you to use this item correctly in your country.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 28 February 2019, Comments Off on Sequential Circuits Prophet 600

“Looks in great shape plays nice comes with shipping box see in pictures” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 31 January 2019, Comments Off on Sequential Circuits Prophet 600

“Fully working Original Sequential Circuits Prophet 600 Keyboard Synthesizer.

Some marks on a few upper keys as well as on one of the lower ones as shown on the pics. The wooden parts show some marks of age and scratches but its only cosmetical (you can actually get the fitting wood parts to replace them, if you wanted).

The synth comes with the original menu in german as well as a book with lots of pages on different ways to program it (witch is actually really quite fun(ny) to play with).” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 10 January 2019, Comments Off on Sequential Circuits Prophet 600

“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.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 27 December 2018, Comments Off on Sequential Circuits Prophet 600

“Selling my p600 of which I am the original owner.
I had it refurbished and the Gligli modification installed in 2015 by Wine Country.
You already know that this is the original MIDI synth with a distinctively aggressive sound.
Includes original manual.
Includes original ePROM incase you want to de-Gigli-ize it.
The unit is in excellent condition for it’s age.
It has a couple of small dings on the wood ends which you can see in the photos.
There is a piece of electrical tape covering the Sequential Circuits logo on the back. (Back in the olden days of the original synth wave we did not want advertisements on stage ;-)) ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 29 November 2018, Comments Off on Sequential Circuits Prophet 600

“SCi Prophet-600 programmable polyphonic synthesizer

Looks 8.75 of 10

In good shape but partly refinished (top panel near wood ends), please see pictures.

Works 10 of 10
Everything works as specified, overhauled before shipping to have long life and to keep original sounds.
Change all electrolytic capacitors and short life transistors, opamps and logis ICs with new ones,
and keys knobs, sliders, switches and jacks cleaning before shipping.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 18 October 2018, Comments Off on Sequential Circuits Prophet 600

“SCi Prophet-600 programmable polyphonic synthesizer

Looks 9.50 of 10

In very clean conditin, pictures say everything.

Works 10 of 10
Everything works as specified, overhauled before shipping to have long life and to keep original sounds.
Change all electrolytic capacitors and short life transistors, opamps and logis ICs with new ones,
and keys knobs, sliders, switches and jacks cleaning before shipping.

New membrane switch pad installed.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 11 October 2018, Comments Off on Sequential Circuits Prophet 600

“A nice condition Prophet 600 with the Gligli mod. This synth is sooo warm compared to modern synths. Just had it tuned up by The sequential guy here in the Bay Area. The Gligli mod changes up a few of the functions some of the knobs do so make sure to download the Gligli manual to know what your twisting. As with all vintage analog synths, let her warm up for at least 5 minutes to let the oscillators tune. It’s with a heavy heart that I sell this wonderful machine.. ”
Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 13 September 2018, Comments Off on Sequential Circuits Prophet 600

“I’m very sad to see this one go, but I need the space in my tiny studio. I’ve only owned it for a year and it has not left my studio. Previous owner was a well known keyboard/vintage gear shop.

I’ve gone through all the keys and knobs. Everything works great. Certain numbers on number pad can get stuck occasionally but after tapping once or twice they go back to working fine. The output sounds great, and the midi works. Sequencer and arp are working too! ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 06 September 2018, Comments Off on Sequential Circuits Prophet 600

“Very very sad to see this one go, but I need the space in my tiny studio. I’ve only owned it for a year and it has not left my studio. Previous owner was a well known keyboard/vintage gear shop. ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 09 August 2018, Comments Off on Sequential Circuits Prophet 600

“This keyboard works almost like new! I discovered two keys that don’t work unless you press on them pretty hard. I suspect they need to be cleaned underneath. Some of the wood has also been damaged – otherwise, it is in great condition! ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 02 August 2018, Comments Off on Sequential Circuits Prophet 600

“This keyboard works like new! Some of the wood has been damaged – otherwise, it is in great condition!” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 19 July 2018, Comments Off on Sequential Circuits Prophet 600

“SPECIFICS
*This synth is 100% Functional. (Everything works as if it was brand new including all controls, pots, switches, LEDs, & input/output jacks.).
*The electronics is 100% Functional. All VCO’s, VCFs, ADSR’s, VCA’s, LFO’s, etc work as they should.
*The touch pad (membrane switches) works like new.
*The keyboard action is like new and all keys are in alignment. All 61 keys are functional and none of them stick.
*This synth is in immaculate cosmetic condition with no noticeable dings, scratches, or blemishes. ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 05 July 2018, Comments Off on Sequential Circuits Prophet 600

” Prophet 600. In great condition everything works. Had it serviced 1 year ago. Doesn’t get played enough.
I’ve owned for almost 30 years. Purchased in August of 1988.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 21 June 2018, Comments Off on Sequential Circuits Prophet 600

“Sequential Circuits Prophet 600.

One owner purchased in 1982.

Has original box it shipped and stored in.

Original instructions, foot pedal, and factory programs cassette tape included. ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 21 June 2018, Comments Off on Sequential Circuits Prophet 600

“This one is in really nice shape and is in great working condition. As you can see in the photos, this Vintage analog synth has been well looked after and has the regular wear and tear for a vintage synth of this age and pedigree.The unit has been fully tested, cleaned regularly and maintained well.All the keys, sliders, knobs, and switches are original and working as they should be.The front panel is clean with the usual marks & blemishes for a vintage synth of this age. Front panal has a very unnoticeable scratch (shown in photo)Back of unit has usual tour wear and tear as expected.The synth has been kept and stored in a climate controlled recording studio.Both beautiful side panels are brand new and without a blemish. (the originals are also included)This Prophet 600 is good looking and solid” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 14 June 2018, Comments Off on Sequential Circuits Prophet 600

“Condition: B +: no problems in applications that normally use
Year of Manufacture: Unknown” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 07 June 2018, Comments Off on Sequential Circuits Prophet 600

“This synth uses the same CEM 3340 VCOs you’ll find in the Prophet 5 Rev 3 and OBerheim OBXA/OB8.

First commercial synth with MIDI

Pro Serviced (May 2018) with fulll calibration, GliGli installation, and keybed service. Gligli brings it up to specs with most modern synths regarding midi clock/sysex support/overhauled lfo and envelope sections/fm capabilities, filter drive and way more. This is basically as close as you’ll get to a prophet 5 without spending 5-6 grand. It’s a nasty nasty sounding synth especially for the money. Everything works, but you might want to clean the keybeds a touch.

Pro serviced by Analog Synth Service May 2018.
Sequential Circuits Prophet 600 with Teensy/GliGli Update installed.
New membrane panel also recently installed.
This synth is in excellent working condition with all keys, buttons, switches and knobs working perfectly.
Cosmetically it has some wear on the wooden sides and also some minor scratches and tape residue. See pics for more details. ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 31 May 2018, Comments Off on Sequential Circuits Prophet 600

“Sequential Circuits Prophet 600 analog synthesizer.
All keys work.
New on-board battery” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 24 May 2018, Comments Off on Sequential Circuits Prophet 600

“Sequential Circuits Prophet 600 with GliGli Chip Update installed.

The GliGli update basically it adds many new functionalities, such as making the envelopes punchier and adding more arpeggio settings, Google it!

This synth is in excellent working condition with all keys, buttons, switches and knobs working perfectly.

Cosmetically it has some wear on the wooden sides and also some minor scratches and tape residue. See pics for more details.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 26 April 2018, Comments Off on Sequential Circuits Prophet 600

“Good condition . Everything works as should . Great sounding synth. Original factory presets in the keyboard .” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 26 April 2018, Comments Off on Sequential Circuits Prophet 600

“Great sounding piece I’ve rarely used over the years. Needs a new home. I got it in the mid 90’s exactly as is shown. Signed. Keyboard works fine bit has a cig burn and cracked key. The entire replacement of the keyboard is about 100$ but I never had a problem with it, I’m more concerned with how it sounds (awesome) then the cosmetic issues. ”
Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 19 April 2018, Comments Off on Sequential Circuits Prophet 600

“This Prophet 600 looks amazing for its age. All the knobs function and all LEDs light up in response to the touch pads. I re-loaded the 100 factory preset programs back into it to give it a fresh start and they play,sound and match their descriptions OK. I’ve never had this keyboard worked on and after ten years of home studio use followed by 23 years of storage in my closet here’s what went wrong:

1.) On a few programs, some keys are dead or weak, while in the rest of the programs all the keys sound out as they should. It exhibits this behavior since I pulled it out of storage. I probably should replace the battery but I don’t want to put any work/money into it unless I could verify it would fix the problems.

2.) Tunes itself OK but, it seems like an oscillator gets a little wavy at times. (De-tuning noticed during chords). The oscillators have never been tuned, gets a little better as it warms up

3.) That being said overall this synthesizer sounds great and I believe a little technical service will revive this rare and (truly vintage classic) analog synthesizer. NOTE: While taking photos I noticed it appears to have been factory signed. Pretty faded though” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 12 April 2018, Comments Off on Sequential Circuits Prophet 600 Project Machine

“THIS SALE IS FOR Vintage Sequential Circuits Prophet 600 Synthesizer PROJECT

INCLUDE: NO POWER CORD. UNTESTED

HISTORY: ITEM CAME FROM STATE SURPLUS AND IT IS “AS IS” NO RETURN ”
Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 12 April 2018, Comments Off on Sequential Circuits Prophet 600

“Great sounding piece I’ve rarely used over the years. Needs a new home. I got it in the mid 90’s exactly as is shown. Signed.

Keyboard works fine bit has a cig burn and cracked key. The entire replacement of the keyboard is about 100$ but I never had a problem with it, I’m more concerned with how it sounds (awesome) then the cosmetic issues.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 22 March 2018, Comments Off on Sequential Circuits Prophet 600

“Great working condition”
Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 25 January 2018, Comments Off on Sequential Circuits Prophet 600

“Classic analog synth with amazing fat leads, lush brass, atmospheric pads and filter sweeps from early-mid 1980s, with MIDI, comes with hard case.

The high A key was repaired professionally and is fully functional, just shows some slight discoloration. See pics for wear/scratches on wood and rest of body.

Membrane keypad and LED display are new (exact replacement part), and were professionally installed.

I played this keyboard for years in a gigging/recording band and loved the amazing analog sounds you could coax out of this thing. It has a unique and undeniable character. Has real heart as an instrument and I hate to see it go.

Hard Case is made of thick plywood covered in felt with metal corners and hardware. Inside is foam. Very heavy-duty build and is valued at ~$125 on its own–included with your purchase at no extra charge.”
Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 04 January 2018, Comments Off on Sequential Circuits Prophet 600 Project Machine

“NOT WORKING! Will not turn on. I have owned this synth since it was new for my home studio. See pics for superb cosmetic condition. Never gigged, never left it’s climate-controlled, smoke free environment. I do not know what the issue is, but before it went into storage I tested it and found several keys did not play. This was always played thru MIDI from my DX7, so I didn’t notice this before that. Hopefully someone familiar with these can bring it back to life-these instruments have a wonderfully rich sound and deserve to be played.

It will ship with the original Owner’s Manual and a HYBRID flight case that I had made for it when new.

The Prophet-600 is a 6-voice polyphonic analog synthesizer with a 5-octave, 61-note (C-C) keyboard. Each voice consists of two VCOs, two VCFs, and two VCAs. Each of these components has its own independent ADSR envelope. Each Prophet-600 voice uses 2 sets of Curtis Chips for its architecture.”
Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 09 November 2017, Comments Off on Sequential Circuits Prophet 600

” Selling ]1982 Sequential Circuits Prophet 600 ]e. Everything works perfectly excep program cover is loose it has been taped does not effect plays great please see photos ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 02 November 2017, Comments Off on Sequential Circuits Prophet 600

“Selling my 1982 Sequential Circuits Prophet 600 along with the case. Everything works perfectly as the person who owned before me was a sound engineer. Great value for a vintage analog synth! Does not have Gligli update.” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 26 October 2017, Comments Off on Sequential Circuits Prophet 600

” For sale is my Sequential Circuits Prophet 600 synth. It’s fully functional and in nice shape. It does have some wear so be sure to check out the pictures to make sure you like it. Classic vintage analog SCI synth, don’t miss out. ” Click here to visit listing on eBay

Prophet 600, Sequential Circuits @ 14 September 2017, Comments Off on Sequential Circuits Prophet 600 Project Machine

“All internal chips are missing

You are bidding on a Sequential Circuits Prophet 600

This unit is for spares or repair

It will need major work to restore but is reflected in the price” Click here to visit listing on eBay