Diode Gate B168

This document is a technical schematic for the Digital Equipment Corporation Diode Gate B168 module, dated 1966. The circuit consists of nine parallel channels, each featuring a 2N4258 transistor connected to a network of D662 diodes and 68kΩ resistors. The design uses a -15V supply line and a +10V reference, with additional 5.6kΩ resistors for biasing. The schematic also includes a conversion chart for the components, specifying that D662 and D664 diodes correspond to industry-standard 1N645 and 1N3606 diodes, respectively.