The CV668 is a transmitting triode with a directly heated thoriated tungsten filament. The prototype was the 35T for use at up to 100 MHz, at maximum input one 35T can produce up to 235 Watts of RF. The anode is small but can dissipate 50 Watts.
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 tripod supports the cage grid of vertical rods.
The Ux4 base pins and ceramic insulator - suitable for use in humid areas such as aircraft.
Within the anode can be seen the wires of the cage grid and the helix of the thoriated tungsten filament.
The collar at the lower end of the grid.
Through the top hole in the anode can be seen the grid wires and part of the filament helix.
The wide glass tube envelope is 45 mm in diameter and, excluding the UX4 base pins, is 122 mm tall.
