The Arp 2500

Described as "the embodiment of second generation design and thinking" The 2500 was aimed at "the serious ultra-professional" and had a price tag of around £5400 in 1973, more than the average detached house at the time! There was no fixed configuration, as customers specified the module complement when ordering. Arp made much of its precision and fidelity, no doubt to try and win over Moog customers, used to unstable oscillators. The 2500 however was not entirely without flaw. Several modules (1027, 1045 and 1047) were known to suffer from instability.

The following pages include scans from a number of early ARP/Tonus Inc documents. One is a preliminary "Development Report" from March 1970, the other dated August 10th 1970. The preliminary document includes a tantalising list of "coming soon" modules (Marked as "Proposed module" in the table below), most of which never saw the light of day.