The CV5073 (6AM4) UHF triode is designed for grounded grid operation to ensure the maximum isolation between input and output circuits. The grid has many connections in order to approximate to a ring. The article on valves for bands III, IV & V gives details of the construction of the CV5073 that builds a sensibly planar valve into a B9A envelope.
The gold-plated pins indicate that this is a relatively modern specimen (1980s? and suggest professional usage in communications link equipment eg. on a microwave link tower. This is not your average TV valve! but it was originally designed as such.
The close wound control grid is wound on copper supports. The working face of the anode is small and very close to the grid. The bulk of the anode metal is distant from the grid.
The cathode tube can be seen as having a slightly rounded working face.
Looking directly at the heater entering the cathode tube.
Mounted horizontally in the 21 mm diameter glass tube the structure is braced at both sides for vibration resistance.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 37 mm tall.
References: Data-sheet & 1040 Type CV5073 was first introduced in 1954. See also1954 adverts.
