The CV2171 is a noise generating diode for use up to 500 MHz. The filament is tungsten and the prototype was the VX3120. The commercial version is the A2087.
The KB/Z identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the Z identifies the maker as MO Valve Company, Hammersmith.
The small diode is mounted horizontally with short leads for minimum inductance. The filament is a single V.
The tungsten filament is held in folds of the supports as spot welding is not practical on tungsten.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 46 mm tall.
Reference: Data-sheet. Type CV2171 was first introduced in 1959. See also1959 adverts.
