Diode Gate B163

This document is a technical schematic for a "Diode Gate" circuit (model B163) produced by Digital Equipment Corporation in 1966. The schematic details an electronic circuit composed of six transistor stages (Q1 through Q6) integrated with a diode matrix (D1 through D41) and various resistors and capacitors.

Key technical specifications noted on the document include:

• Components: Uses 2N4258 transistors, D-662 and D-664 diodes, 1/4 watt 5% resistors, and .01 MFD capacitors.
• Power requirements: The circuit operates with a +10V supply, a -15V supply, and a -3V "strate" (substrate/bias) connection.
• Purpose: The schematic is intended for test and maintenance purposes and is noted as proprietary information belonging to the Digital Equipment Corporation.