W600

This document is a schematic diagram for a "Negative Level Amplifier W600" (part number CS W600-0-1, Revision B) by Digital Equipment Corporation, copyrighted in 1964. It is intended solely for test and maintenance purposes and its circuits are proprietary.

The schematic illustrates a three-stage amplifier circuit, featuring three transistors (Q1, Q2, Q3) along with various resistors (R1-R12) and diodes (D1-D12). The circuit operates with +10V and -15V power rails and a ground connection.

Included with the diagram are:

• A detailed "Parts List" specifying component types (e.g., Transistor DEC-2894-3B, various wattage/tolerance resistors, D662 and D664 diodes) and their corresponding Digital Equipment Corporation part numbers.
• A "Transistor & Diode Conversion Chart" providing EIA equivalents for specific diodes (D662 corresponds to IN645, D664 to IN3606).
• Revision history and dates of drawing, checking, and engineering in July-August 1964.