VFO CLOCK B410

This document is a schematic diagram for a VFO Clock, model B410, copyrighted by Digital Equipment Corporation in 1969. It illustrates the circuit design, including various transistors (Q1-Q4), numerous diodes, resistors, and capacitors, along with their specified values and interconnections. The circuit features multiple inputs such as +6.2V and -5.6V supplies, analog and control inputs, a trigger input, and an enable input, as well as +10V and -15V power connections, leading to an 'OUTPUT' and 'DIGITAL GND'. General specifications for components like resistors (1/4W, 5%), diodes (D664 unless otherwise indicated), transistors (DEC4258), and capacitors (.01 MFD, 100V, 20%) are provided, with an additional note that dotted components are optional. A conversion chart is included, listing equivalent part numbers for transistors and diodes between DEC and EIA designations. The document is stated to be for test and maintenance purposes and is proprietary.