Great sounding 2VCO monosynth. The 60F was mfg. under licence from ARP as denoted by the tag on the rear and from comments I see probably this synth too. However someone comments that looking up the patent information the only thing lisenced to them was the use of the pressure pad technology and also for the SX-400. The filter is similar to Moog though. And the VCO's have the familiar uA726 of course used in many 70's designs. Lots of op amps. Don't really see anything in the circuitry that ARP could have patented, so that's probably right.
Haven't seen one of these yet. Obviously a myriad of things that can go wrong and fortunately the diagrams are online!
I should have many parts for these. Contact me if you need something.