W640

This document is a schematic diagram for the "PULSE AMPLIFIER W640", produced by Digital Equipment Corporation and copyrighted in 1964.

It is explicitly stated that the schematic is for test and maintenance purposes and that the circuits are proprietary.

The document provides:

• A detailed circuit diagram featuring numerous transistors (DEC6534B, DEC3639B), diodes (D664), resistors, capacitors, and transformers (T2071).
• General component specifications, including default values for capacitors (0.01 MFD), resistors (1/4W, 5%), and specific types for diodes, transistors, and transformers unless otherwise indicated.
• A Transistor & Diode Conversion Chart, listing DEC part numbers and their EIA equivalents (e.g., DEC3639B to 2N3639, DEC6534B to MPS6534, D664 to 1N3606).
• Drawing information, including revision history and the names and dates of the drafter, checker, and engineers.