The VU111 is also known as a CV1111. This exhibit is badged as made for Marconi in Canada by its subsidiary RVC.
The ribbed anode is a flattened cylinder and is blackened for better heat radiation cooling. The construction employs ceramic insulators to provide rugged construction and to withstand the high voltages and operating temperatures.
This high voltage high power half wave rectifier can deliver 125 Watts. A pair producing 250 Watts could feed a high voltage low average current transmitter output stage such as a Radar magnetron.
The oval anode ribbed for stability and with side fins for extra cooling.
The Canadian Marconi company.
The three section filament held on tensioning springs that are attached to the substantial ceramic top support.
The pinch with lower ceramic support directly above. Also one can see the lower filament fixings.
The classic envelope is 48 mm in diameter and excluding the B4 base pins, is 126 mm tall.
