From Michael E Caloroso Sent Sat, Jun 30th 2018, 18:58
From Michael E Caloroso Sent Sat, Jun 30th 2018, 18:58
Two people may have info on the 4010 VCA: Joachim Verghese (jocke at netcontrol dot fi). He authored this ARPTech webpage on ARP modules, which Don Tillman hosts. http://www.till.com/arptech/modmain.htm Phil Cirocco of discretesynthesizers.com. He acquired a lot of information from Al Pearlman himself, especially modules of the 2500 from which the 4010 may had originated from. ARP had legitimate reasons for encasing modules in epoxy. The temperature gradients that caused tuning drift were minimized as they were (largely) isolated from the environment. ARP had advanced designs and in the interest of protecting them the epoxy made it very difficult to reverse engineer. The practice was not uncommon at the time, and before ARP was founded Al Pearlman used to design discrete opamps that were used in military and aerospace products. The epoxy was also good at hiding patent infringements, as Moog found when they broke into a 4012 module and discovered their patented ladder filter was being infringed. Sent from my iARPLibraryReference, MC