ARP 2600 Early Tonus Model

ARP 2600 Early Tonus Model For Sale. 

We take great pride in our ARP 2600 restorations. This unit has received an extensive overhaul and future-proofing by perfectionists (us) to make it better than all others you may find. This process took approximately 47 hours of skilled labor.

Unlike most other early 2600s, we didn't need to replace any of the encapsulated modules inside this unit, so they're the same ones that were inside it when we got it.

In addition to fixing any problems problems, we did the following work:

-Disassembled and cleaned inside and out
-Replaced cinch jones connectors
-Rebuilt power supply in an effort to not only improve performance but to also extend this units life (replaced power supply electrolytic and tantalum capacitors, replaced power supply trimpot)
-Cleaned and lubed all potentiometers and cleaned all jacks
-Removed and cleaned all keys
-Replaced all keyboard bushings
-Cleaned all key contacts
-Removed and cleaned bus bars
-Adjusted key heights and spacing
-Replaced tantalum capacitors as a preventative measure
-Recalibrated
-Multiple systematic tests performed over an extended burn-in period to ensure stability
-All tests passed

Eagle eyes may notice that the keyboard control panel has an 1/8 jack on it. This modification is an output for a 2nd keyboard voice voltage. This version of 2600 has a monophonic keyboard whereas some later models had a duophonic keyboard. On the duo keyboards, the first key pressed would send a voltage to the synth section and if a second key was played, its voltage is available to patch into the synthesizer manually. The circuit added in this modification wasn't designed well, so the 2nd voice tracking isn't good. Since it's not harming the instrument and could still be useful, we left the modification connected instead of removing it. Consider it a bonus but you probably wouldn't want to use it to play oscillators. It should be useful for modulating a non-oscillating filter or VCA though.

2600 synthesizer sn2637x
3604p keyboard sn3637x

Here's a video of this unit in action. Isn't she lovely?