The CV5343 is an all glass pulse power tetrode on a B5F base. The anode dissipation is given as 250 Watts. The prototype was the CV2131. The closest commercial equivalent is the QY4-250 where the maximum anode voltage was 4 kV. Mullard advertise the QY4-250 for use in high power audio applications probably in Class B for public address or transmitter modulators rather than hi-fi.
This exhibit was taken from a sealed polythene pouch for photographing.
The CV data-sheet was issued by the Admiralty Surface Weapons Establishment. The CV5343 was probably used as a pulse modulator for a small radar magnetron. For a 100μS duration pulse the power delivered in the pulse is as high as 10 kW.
The reverse of the envelope carries the hazard warning.
The base pins look to be silver plated.
The anode is metal not graphite. The grids are made from a series of vertical rods held in place top and bottom.
This is an unused valve but within the envelope is the shattered remains of the filament.
The wide glass tube envelope is 84 mm in diameter, and excluding the B5F base pins is 131 mm tall.