The CV1366 is a transmitting pentode with the V248A as the prototype. The old Army service code is ATP4. The anode dissipation is 5 Watts.
The KB/EN identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the EN identifies the maker as Thorn-AEI, Sunderland.
The face view of one of the two parallel connected pentode sections.
Side view.
One pentode showing the three wire grids.
Here at the top the filament tension springs can be seen but not the filaments.
The classic envelope is 39 mm in diameter, and excluding the MO base pins is 99 mm tall.
Reference: Data-sheet. Type CV1366 was first introduced in 1940. See also1940 adverts.
