DIODE GATE B168

This document is an electrical schematic for a "DIODE GATE B168" circuit, copyrighted by Digital Equipment Corporation in 1966. It is intended for test and maintenance purposes and contains proprietary circuit designs. The schematic illustrates a series of nine identical logic gate stages (Q1-Q9), each employing a transistor, input diodes (D662 type), and associated resistors. Power is supplied at +10V and -15V, with a ground reference. General component specifications are provided, indicating that resistors are 1/4W, 5% tolerance, diodes are D664 (or IN3606 EIA equivalent), and transistors are 2N4258 (or IN645 EIA equivalent). A conversion chart for transistor and diode part numbers between DEC and EIA standards is also included.