The CV1510 is a single beam tetrode and is an early all glass envelope design. The maximum full power frequency is 60 MHz. The output is modest and the dissipation high in relation to the Class C output power and this is consistent with early VHF devices.
The CV309 is the CV1510 with plated pins and a maximum full power output frequency of 150 MHz.
The KB/A identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the A identifies the maker as Mullard, Blackburn, pre Jan 1951.
The screening is both above and below the mica discs.
The control grid copper support rods can just be seen together with part of the winding. The key on the spigot ensures correct insertion into the socket.
The glass foot base. Basically an all glass valve in construction.
The wide glass tube envelope is 32 mm in diameter, and excluding the B9G base pins is 58 mm tall.
References: Data-sheet & 1040. Type CV1510 was first introduced in 1947. See also1947 adverts.
