Marconi Mk VII Camera Power Supply type B3210
The PSU for the camera channel is 5U high (8.75") and weighs 49Kg (108Lbs.)
The PSU is a transformer based linear regulator with the pass transistors on a substantial heatsink on the rear.
A switch on the front panel compensates for voltage drops in cable lengths up to 600m. (2000ft.)
( poor photo section missing to the right.)