Rare Tonus logo of the Arp 2600, most likely a 2600P V2.0 (based on serial number and modules inside). This is one of the more desirable sounding Arp's to get with the 4027 Oscillator and 4012 Filter than the later G-clef and orange/black models. It has 1 potted 4027 and two unpotted 4027 (with circuit board reading 4027-014 Rev B).
Very good condition, with some wear as expected for its age but overall still nice shape. Most of the wear is on the outside tolex, the front panel face and keyboard itself are in great shape. Includes both lids to unit and keyboard along with keyboard connecting cable. Recently fully serviced by professional tech. We've had many 2600s pass through our shop over the years and we found this particular unit to sound fantastic. It's 100% fully functional, just back from servicing. At some point this was modified to accept standard 3-prong cable instead of the unusual oval shaped cable they original came with. This modification does not effect sound, and is more convenient at the oval-cable's are hard to find should it ever get lost.
Polyphony - Monophonic
Oscillators - 3 VCOs: VCO 1 saw / sqr; VCO 2 saw / sqr / tri / pulse / sine; VCO 3 saw / sqr / pulse (Model 4011 VCO on early 2600s, replaced by Model 4017 VCO, replaced by Model 4027 & 4027-1); White Noise Gen: Continually variable from LF to pink to white (Model 4016 Noise Gen replaced by Model 4022).
LFO - Patchable with tons of modulation sources and shapes; Model 4015 Sample and Hold.
Filter - 24db lowpass, self-oscillating; Digital Ring Modulator: AC or DC coupled. Model 4012 VCF (1970-76). Model 4072 VCF (1976-81).
VCA - Env 1: ADSR
Env 2: AR; Linear or Exponential control; Envelope Follower
Model 4010 VCA on early 2600s, replaced by Model 4019 VCA.
Effects - Spring Reverb
Keyboard - Remote Keyboard with 49 keys (Models: 3601, 3604, 3620)
Arpeg/Seq - YES via ARP Model 1601 Sequencer
Control - CV/GATE
Date Produced - 1971 - 1980
