ARP 2600 Identification chart
   
 

 

This list is based on CMS's considerable database of ARP 2600's we have worked on in the past 28 years.

UPDATED 4/9/2022

© 2022 all rights reserved CMS / Phil Cirocco

 
   
           
 
 

The Blue Marvin

Model: 2600

early 1971

All metal case w walnut handles & matching metal 3604 keyboard

panel: blue with white graphics

cabinet: white metal

Super rare

1st gen 4011 VCOs, 4012 filter & 4010 VCA use Teledyne output chips

great audio path, Teledyne can type chips

delicate phenolic boards, traces can be easily damaged or destroyed

 
 
This ARP 2600 and matching 3604 keyboard is owned by Phil Cirocco of CMS/Discrete Synthesizers. No upgrades were needed for this unit. This 2600 once lived at 20th Century Fox.
 
 
   
 
         
 
 

The Gray Meanie

Model: 2600C

mid to late 1971

All metal case w walnut handles & matching metal 3604C keyboard

panel: gray with white graphics

cabinet: black metal

Very rare

1st gen 4017 VCOs, 4012 filter & 4010 VCA use Teledyne output chips

great audio path, Teledyne can type chips, fiberglass boards

late 1971 - change to National Semiconductor (NS) LM301 chips

 
 
We recently restored this beautiful 2600C with matching 3604C keyboard, back to factory specs and full functionality for Illinois State University.
 
         
 
 
 

Model 2600P V1.0

mid 1971

Pearlman's suitcase cabinet w shuke (shuck-ee), plywood & tolex w matching 3604P keyboard

panel: gray with white graphics, 14.4 " high

cabinet: tolex covered plywood

1st gen 4017 VCOs, 4012 filter & 4010 VCA use Teledyne output chips

great audio path, - Teledyne can type chips, fiberglass boards

Identifiers - Square shaped speaker grilles, serial number on side of shuke. Grooved edge - both cabinets

 
     
   

This pristine 2600P V1.0 pictured above lives in the CMS studio/lab. The matching 3604P keyboard has the ARP factory 2nd voice modification.

 
   
 
         
 

Model 2600P V2.0

late 1971 - 1972

No external changes, Serial # restart using 26XXX format - Nov 1971

panel: gray w white graphics, 14.4" high, square speaker grilles

1st gen 4027 VCOs, 4012 filter & 4010 VCA

audio path changed to NS chips, DIP type chips

mid 1972 - VCA changed to 4019, 4012 VCF & VCA change to NS output chip - 2600P V2.1

muddy sound due to poor slew rates. Increase in noise levels

 
This 2600P V2.0 is the second machine that Trent Reznor sent to us for internal audio upgrades and restoration. This particular unit uses Odyssey 2 slider caps. We have also restored and tripped out his pristine 2800 Odyssey.
 
   
 
 

Model 2600P V3.0

late 1972 - 1974

production of 2600s peaked during this period

panel increased to 15.5", oval speaker grilles

2nd gen 4027-1 VCOs, 4012 filter, 4019 VCA

late 1973 - simplified silkscreen & new ARP logo - 2600P V3.1

mid 1974 - reverb tank changed to 10" - 2600P V3.2

poor slew rates, noise and hiss, muddy sound

 
 
 
Several years ago we restored and upgraded this 2600P V3.1 for the late Adam Yauch of the Beastie Boys
 
         
 
         
 

Model 2601 V1.0

1975 - 1976

3620 duophonic keyboard

smaller trim pot holes

serial number restart 2601-XXX, moved to bottom plate

some sub-modules un-encapsulated

input jack upgrade, better printed circuit board mounts - better slider feel, solid construction

2nd gen 4027-1 VCOs, 4012 filter, 4019 VCA

early 1976 - 4012 filter changed to 4072 - 2601 V1.1

poor slew rates, noise and hiss, muddy sound

 
     
  The CMS upgraded 2601 V1.0 pictured above is owned by Lenny Kravitz  
     
 
 
         
 

Model 2601 V2.0

1977 - 1980

black front panel with orange and white silkscreen w matching 3620 duophonic keyboard

all sub-modules un-encapsulated

input jack upgrade, better printed circuit board mounts - better slider feel, solid construction

2nd gen 4027-1 VCOs, 4072 filter, 4019 VCA

poor slew rates, noise and hiss, muddy sound

final units (1980) use Avatar power supply, solus hardware & top handle - 2601 V2.1

 
   
 
 
   
This was my main workhorse for many years. It was also later incorporated into the "big box" (below). in 1988 it was re-installed into the original ARP cabinet. It still looks brand new considering the electronics have been on the road. Alan really knew how to build them.
 
       
         
 
     

CMS Model 2607 V1.0

2017 to present

brushed aluminum front panel with black graphic image impregnated into the metal

exact same Switchcraft jacks that were used in the ARP 2600

uses CMS improved CX type 4000 series sub-modules for superior sound quality

2nd gen 4027-1 VCOs, 4012CX filter, 4019CX VCA, 4014CX RM

too many improvements to list here - please see our 2607 page

 

 
SO DO WE
 
   
           
 
 
CMS reserves the right to change and update this info at our discretion. This info is based on our extensive database of units we have serviced over the years. Also thanks to Alan R. Pearlman for help compiling this data.
 
         
   

Estimated production numbers:

2600 - 25 units (light blue metal case with matching metal case keyboard)

2600C - 35 units (light gray metal case with matching metal case keyboard)

2600P - 1700 units (standard suitcase 2600)

2601 - 1000 units (standard suitcase 2600 with input jack update)

 

2600 production peaked in 1973-74.

The 2600P v3.0 is the version that was produced in the greatest quantity.

The later model 220v european version carries the 2602 designation. There were relatively small numbers of these sold, but they are electrically identical to the 2601.

The best 2600 to look for?

Chronologically, 2600's got more reliable and serviceable as production progressed throughout the 1970's. The biggest change was the 2601 update that replaced all the input jacks with a more reliable type of jack. However, this improvement required that each jack be hand wired to the circuit boards, pushing up the labor costs considerably. The printed circuit boards were fitted with additional supports that improved the tactile feel of the sliders and also improved mechanical reliability. The retail price of a 2601/3620 was $3300.00 in 1975.

It's also obvious that 2600's got progressively worse in the audio department. The best sounding units being the very first ones, and the worst sounding units being the last. All units made from 1972 onward sound very muddy, hissy and thumpy straight from the factory.

Probably the best course would be to find a late model (2601) and get the audio upgraded here at CMS. The earlier units do sound better from the factory, but the numerous mechanical problems can add up to a hefty repair bill especially if the 2600 in question, has been exposed to moisture for long periods.

Extensive road use is obviously another cause for concern. Indications are a yellowish silkscreen (tobacco) and a worn silkscreen in the filter mixer and ADSR sections.

See the 2600 page for upgrading your late model 2600 to original audio specifications.

 

Other interesting info:

The 4012 filter was used for all 2600's from the very beginning through 1976.

The all metal cabinet version of the 2600 appeared in 2 colors, light blue (2600) and gray (2600C).

The Blue Marvin is freaking bright blue! It's not "blue gray"!

It's not called a Blue Meanie! - Source: Alan R. Pearlman

The "Gray Meanie" nickname appeared in the late 80's probably as a result of the Blue Marvin misconception. It's real name is the 2600C.

 

©2006 - 2022 Phil Cirocco / CMS

   
         
 
           
   
"THE BIG BOX"
         
In the pre MIDI days, I built the "Big Box" for live shows. It had: a 2601 V2.0, 2 patchable 2800 panels, TR-808, Teac Mixer and rack-mount effects section. Like a giant 2600, It had a lid with latches and the keyboards and sequencers plugged in the left side. The above photo shows it in operation in Bethlehem PA in the early 80s. The scratched up polaroid below was taken in Cape Neddick ME, circa 1985.
         
   
   
         
 

At a later date, I took the second 2601 V2.0 that is sitting on top in the above photo, and mounted that front panel in place of where the mixer and TR-808 was. It looked and sounded freaking awesome, a big wall of ARP patchability! Unfortunately, no photos of that final version still exist.

 
     
           
               
 
               
 

e-mail: filter@discretesynthesizers.com

Phone: 912-727-2195

  © 2007 - 2022 Phil Cirocco