The VR22 battery triode was a popular type and had many equivalent types. The service types show that it was used by all armed services from the 1930s. As an audio output valve it produced 0.18 Watts.
The CV1022 is the same valve and both were based on the Cossor 220PA.
Power was a wet accumulator for the filament and a dry battery for the anode supply.
The anode is wide but the front to back dimension is small, about 3.5 mm. The etched VR22 can be seen.
The filament tension springs are supported on a mica that is spaced above the main top mica.
The tension springs. The support mica is attached to the grid support rods and the spacing is achieved by strips of metal spot welded to the rods.
The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 83 mm tall.
References: Data-sheet & 1043. Type VR22 was first introduced in 1935. See also1935 adverts.
