This jumper selectable feature enables a mono source to be split to the left and right program busses. These jumpers are provided for each microphone channel and all high level channels. All program buss switches are rugged telephone-type roller cam design with gold alloy contacts. Additional closure contacts provide for internal relay muting. All microphone inputs are coupled with a dual shielded, high RF suppression transformer.
All active circuitry is located on plug-in modules for flexibility and ease of maintenance.
The printed circuit boards are 2 ounce copperclad FR-10 fiber glass laminate, tin lead electroplated. The monitor power output transistors are heat-sunk to the chassis rear panel for maximum heat dissipation. All input-output connections are made to screw terminal barrier strips clearly identified to aid in wiring without reference to the manual. The console harness cables are also identified and correspond to the internal circuit board wiring point markings and the wiring diagram. 600 ohm, transformer balanced.