The CV483 is the UK government code for the Mullard QV04-7 single beam tetrode. The use was for transmitters up to the low VHF region. The specification gives the prototype as the CV309 which in turn was the CV1510 with plated pins.
The design is all glass as were all of the B9G based valves. The valve would have been used for driver and frequency multiplier stages as well as for low power transmitters. It was designed for class C service.
The central active anode has heat sink wings. The metal springs hold the top mica firm in the tubular envelope.
The metal base and spigot with locking groove and key.
a detail image of the shaped pins. The base was sprung to grip the small pins.
The anode is an oval shape and the cathode seems to be the same. The tray above he top mica connects to the beam plates. This may act as a neutralising capacitor.
The wide glass tube envelope is 32 mm in diameter and, excluding the B9G base pins, is 57 mm tall.
Reference: Datasheet. Type CV483 was first introduced in 1947.