
"I'm in the process of refurbing my early model grey face ARP 2600. Most
folks would call this a gray meanie as it has all first rev boards and
all op amps are octal not DIP. It does not have a 4410 ADSR. The ADSR
in the unit is labeled "Board 4-1" and is a good bit larger than a 4410.
Board 4 also has odd header locations for the 4019 VCA so several of the
legs on 4019 are bent to make it work. This was fixed in the next rev
of the board.
I'm replacing all the jacks with new Switchcraft 142As and disassembling
and refurbing all the pots. Also, contrary to popular belief, the Cinch
Jones S-306-DB keyboard connector is still manufactured although it's a
couple week lead time from most distributors. In a pinch you can take a
standard S-306 socket and replace the defective socket in the S-306-DB
metal bracket.
While perusing the pics note the silk screened trimmer functions and
jack normalling symbols not present on later units.
http://www.retrosynth.com/gear/arp2600/"