This exhibit is essentially the service equivalent of the GZ32, a medium power full wave rectifier for general purpose use. It probably would have been used in audio power amplifiers or modest radio transmitters.
The maximum reservoir capacitor was 60 µF and the minimum series resistance to limit current was 150 Ohms.
face view of one anode. The circular cathode tube connects to one side of the heater support that is fixed into the pinch.
The anodes side view showing the extra heat sink fins added to the centre of the working faces.
The top mica showing the interference fit to the envelope and how the electrodes are supported.
The classic envelope is 44 mm in diameter, and excluding the IO base pins, is 98 mm tall.
References: Data-sheet & 1040. Type CV593 was first introduced in 1949. See also1949 adverts.