ARP 2600 with ARP 3620 Keyboard

“The mighty Arp 2600 is up for auction.

I have owned this incredible synthesizer for 24 years and it has never left my smoke free

climate controlled studio except for tuning and upgrades.

It was fully tuned and calibrated in March 2021.

This is an Arp 2600 in great condition.

Not only is the exterior and Tolex in great condition, the electronics are also in great condition,

and all features work. Every key on the keyboard plays without glitches or drifting.

Every slider, pot and jack work. All hardware on the cases and the Tolex covering are original.

A matching 3620 keyboard is also in great shape and plays perfectly.

The original lids for the 2600 and 3620 are included.” Click here to visit listing on eBay

ARP 2600 with ARP 3620 Keyboard

“Beautiful Arp 2600 that has been in storage for a long, long time. It is intact-all slider caps are in place as you can see as well as all jacks and switches. There were some professional modifications done by the previous owner (switches/jacks at ADSR and switches on 3620 kybd, and a pot above the kybd CV in the filter section- see pics). I never took the time to determine what the mods did, but you can surmise. I turned it on about 2 months ago, and all three oscillators were working, however after literally sitting for years (it has been more than a decade), it’s going to need a thorough going over by a specialist. If I were the buyer, that would be the first on the list- have it completely gone through, cleaned and brought to spec. If you’re gonna invest in one of these, this one is worthy of your consideration mainly because it’s a very clean unit (no signs of any physical or psychological abuse)! ” Click here to search for synths on eBay

ARP 2600 with ARP 3620 Keyboard

“ALL GEAR IS TESTED AND GUARANTEED TO BE 100%

ANY NOTABLE COSMETIC OR FUNCTIONAL ISSUES WILL BE NOTED BELOW IN RED.

THE PHOTOS THAT ARE SHOWN ABOVE ARE OF THE ACTUAL ITEM YOU WILL RECEIVE.

Seven non-original slider caps (in filter section)
Scratches/scuffs on panel near Ring Modulator input 1 slider
Four non-original chassis screws
Tolex peeling near top of unit
Some corroded metal hardware on case exterior (latches, corner guards, etc.)—see photos
Some corrosion on 3620 Tinijax & 1/4′ washers—see photos

2600 Features

2601 with 3620 keyboard
2601 S/N: 26010605
3620 S/N: 36200605” Click here to search for synths on eBay

ARP 3620 Keyboard

“ARP 2600 model 3620 keyboard by itself, with two foot switch pedals (modified aftermarket).

Must See to Appreciate – Pics don’t do it justice
Zero corrosion on nickel surfaces, including fasteners
Flawless lustrous tolex
Mirror polished scratch-free keytops
New zinc plating on key levers – no corrosion
All keys leveled and aligned and even
New Teflon key bushings
New clear silicone key stops
Zero key clicks, ticks, clacks, squeaks, stickiness, or sluggishness
No mushiness. Key depression and release are crisp with just the
right amount of bounce for a synth action keyboard.
Side to side key play is crisp with definitive stops.
Fully reconditioned potentiometers. Sliders and knob glide like butter
Bus bars and wipers fully disassembled and polished
All key timings adjusted and tested
All jack contacts polished and tested
All voltages freshly calibrated

One owner from 1983 to present.” Click here to search for synths on eBay

Akai 3620 Keyboard for ARP 2600

“Rare opportunity

ARP 2600 model 3620 keyboard by itself, with two foot switch pedals (modified aftermarket).

Must See to Appreciate – Pics don’t do it justice
Zero corrosion on nickel surfaces, including fasteners
Flawless lustrous tolex
Mirror polished scratch-free keytops
New zinc plating on key levers – no corrosion
All keys leveled and aligned and even
New Teflon key bushings
New clear silicone key stops
Zero key clicks, ticks, clacks, squeaks, stickiness, or sluggishness
No mushiness. Key depression and release are crisp with just the
right amount of bounce for a synth action keyboard.
Side to side key play is crisp with definitive stops.
Fully reconditioned potentiometers. Sliders and knob glide like butter
Bus bars and wipers fully disassembled and polished
All key timings adjusted and tested
All jack contacts polished and tested
All voltages freshly calibrated

Imperfections that don’t show up in pics: Some micro-pitting on the handle flanges – only visible from two inches away, otherwise looks bright. Two 2 mm touch-ups on upper edge of control panel – not visible unless you know where they are.

One owner from 1983 to present.

These were only ever sold with the synthesizer.
If you have a 2600 with the older 3604P keyboard and wished you had the 3620, or you have a TTSH and want a real ARP 2600 advanced keyboard, now is your chance.”
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ARP 3620

“Recently found in storage where it’s been for over 15 years. In very good cosmetic condition, but will need to be refurbished. As the title says, this is the more desirable 3620 with a dedicated LFO. ” Click here to search for synths on eBay

ARP 2600 with 3620 Keyboard

“Recently (about a month ago) refurbished by one of the best techs in SoCal (Montoya). It was also previously professionally maintained when I lived up north, about 4 years ago (Siegenthaler). Many 2600s are electronically flaky, and most of any of the keyboards are internally a wreck — but not this pairing. They are electronically in excellent shape, and also are in fairly good shape cosmetically.”
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ARP 2600 with ARP 3620 Keyboard Project Machine

“This vintage ARP is being sold for parts/repair. It does power on (you’ll need a Belkin 17952 power cable available for $20 on eBay) but is being sold as is untested and intended to be sold to someone who would like a great opportunity to buy one of these at a cheaper price for restoration or re-sale purposes. ARP itself is in nice condition shape just missing a few faders the keyboard is in rougher condition and may need more work than the ARP itself.” Click here to search for synths on eBay

ARP 2600 with 3620 Keyboard

“Arp 2601 Synthesizer in overall fair-to-good used condition.

You are buying as-is. I have not gone over the entire synth and checked every feature and combination but it certainly works and makes that incredible 2600 sound. Known issues are a handful of broken faders and pitch tracking issues on Osc 2. ”
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ARP 2600 with ARP 3620 Keyboard

” Classic vintage Arp 2600 analog semi-modular synthesizer with model 3620 keyboard in absolute museum quality condition. This synth was in climate controlled storage, and unused for over 25 years of its life. It has just had a complete refurbishing and had it’s op amps upgraded by RetroLinear, and is absolutely 100% guaranteed to be in perfect operational condition. As you can see from the pictures, this synth is in immaculate cosmetic condition, with only the most minor of rub marks on the case. It’s never been on tour, or used for any live performance. It even smells new! You won’t find a cleaner or more perfectly functioning 2600 anywhere.

This is a model 2601 v1.0. Serial number 143. This version originally had op amps that didn’t sound as good as earlier versions of the 2600, but they weren’t as prone to mechanical problems. These have been replaced with upgraded op amps that combine reliability with the superior sound of the first models of the 2600. A complete listing of the recently completed overhaul is detailed below.

Remove key bed. Clean chassis, remove key bushings and replace with new. Correct geometry. Pull buss bars and springs. Clean keys and install 18 new standoffs. All tantalum caps replaced. All trim pots and sliders replaced. All flux removed and all the boards cleaned. All front panel jacks replaced. New wires installed where needed – most wires from harness saved. Noise generator power mod installed on board 5-1. Reverb gain mod installed on board 4-2. VCF mixer ac coupled mod installed on board 3. Ceramic capacitors audio mod installed on board 4-2. New power supply and sense lines installed. Audio path upgrade mod – replace all OP amps throughout. Calibrated and ground modified for reduced noise. ”
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ARP 2600 with ARP 3620 Keyboard

“Super-rare vintage ARP 2600 Semi-Modular Analogue SynthesiSer with matching serial Duo-phonic 3620 silver livery.

They have been well looked after and loved throughout their ownership. However, like with all vintage musical equipment, they are due a service. For example, the sliders and jacks need cleaning and re-greasing. But a very well made and rare piece of equipment that is well worth the money, the time and the love! ”
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ARP 2600 with ARP 3620 Keyboard


This is ARP 2600 and ARP 3620 duophonic keyboard is now ready for another 40+ years of spectacular sound and music creation.
It is in stunning operational and visual condition. Comes with all the unique original ARP accessories: price lists, demo records, leaflets, user manuals, portamendo pedals etc as seen in the pictures #2 and onward.

The ARP 2600 is one of the most legendary analog synths every made.
Everything from crazy sound effects, Earthquake style base lines, beautiful leads and potent kick drums, the 2600 can do it all.

Highlights future proofing:

* All new high-end capacitor power supply upgrade

* New powerful mains transformer to ensure pitch stability

* Multi turn high end trimmers on power supply upgrade

* All circuit board tantalum’s replaced (critical) with high end capacitors

* All pitch CV trimmers replaced (OEM) in the complete pitch CV chain including
in the 3620 duophonic keyboard (to ensure extreme tuning stability)

* Factory specification calibration (or better)

* New Cinch Jones receptacle (for keyboard connector)

* All keyboard bushings replaced

Complete service documentation available on request.” Click here to search for synths on eBay

ARP 2600 with ARP 3620 Keyboard

” Rare Arp 2601 Synthesizer. It’s time for it to be used to create music again! For many years, it was stored in a spare bedroom closet, and for years, I was going to have it restored and brought up to spec, but alas…, I ran out of time and interest… I did plug it in and turn it on… and all three oscillators generated tone, and they seemed fairly steady (no severe audible drift when tuned to A440 while on). However, I did not go through and test all of the functions and/or all the other modules.
You can see that there were some professional modifications added/done on this one (see pics). It may have been done by Phil Ciricco, the synth wizard at CMS. The quality workmanship of the switches/pots installed is evident, although I can’t say for certain:
3620 KYBD- 2 switches added on right side of controls. Function? Not sure.
VCF Potentiometer- Perhaps variable KYBD voltage control? Not sure.
ADSR- A switch installed and Sustain and Release output jacks? Not sure.
The buyer of this unit will need to invest some time and money in testing, calibration, and possibly some repairs, however the Arp 2601’s are rare and well worth the investment. All the switches, knobs are complete and the tolex has no major tears or holes. Some of the slide potentiometers are a little sticky- none are frozen, but they will need to be professionally cleaned and lubed. This unit looks excellent for being almost 40 years old- as if it lived in a recording studio most of it’s life! What you see in the pictures is what you’ll get. It is being sold as with no warranties whatsoever. I will securely pack the unit in two boxes (main unit and keyboard) and insure it for shipment to the lower 48 States of the USA only. Thank you and best wishes creating music!” Click here to search for synths on eBay

ARP 2600 with ARP 3620 Keyboard

“Stunning original condition and superb working order. Complete professional service completed in February 2018 by US Arp specialist. Checked over by our resident synth expert – it is in superb working order. The front panel, controls and keyboard are all superb and undoubtedly in exceptional original condition for a 2600 of this age. The keys of the 3620 keyboard are showing some age in terms of fine scratches and scuffs but overall this is also is excellent condition. The tolex has some wear and scuffs – mostly on the edges – but nothing serious. Overall this is an outstanding example of an exceptional instrument – the best we’ve seen.” Click here to search for synths on eBay