From the bench:
Unchecked As-Is

General description:
The 6477C SCR-regulated power supply is designed for meduim to high-power applications requiring a fixed or variable dc source with moderate regulation and ripple. All supplies in this series are of the constant voltage/constant current type. Large easy-to-read panel meters continuously monitor output voltage current.

Input and output power, remote sensing, remote programming, and auto-series, -parallel, and -tracking connections are made to bus bars and terminal blocks on the rear panel.

Features:

• Constant-Voltage/Constant-Current type
• Provides a DC output from 0 to 220 V @ 0 to 50 A
• Reverse voltage protection
• Fused AC input
• High Tempurature protection thermostat opens input to power transformer and lights front panel indicator if supply overheats
• Prolonged overlad protection circuit is activated and lights front panel indicator if output current exceeds approximately 115% of maximum rating
• Remote Programming
• Large easy-to-read meters continuously monitor output voltage and current