This VU111 was made by GE in Canada for the UK Government. It is a high voltage high power half wave rectifier that can deliver 125 Watts. A pair producing 250 Watts could feed a high voltage low current transmitter output stage or RADAR system. Equally this device on its own would supply more than adequate power for a WWII cathode ray tube supply.
This exhibit carries the old stores code 10E/146 as well as the Type designation.
As a high voltage device the spacers and insulators are ceramic. Foe good heat transfer the anode has side flanges for additional surface area.
The top insulator and inside can be seen the filament support - also ceramic coated.
The anode is only held in the ceramic insulators and connects to the top cap.
The classic envelope is 51 mm in diameter and excluding the B4 base pins, is 127 mm tall.
