The CV4064 is an RF pentode and has a commercial designation of S6F33. The 'S' signifies a rugged version of the 6F33.
The structure is open with the anode being formed by two small plates that are strapped together.
The KB/F identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the F identifies the maker as STC, Paignton.
The close wound suppressor grid can act as a second control grid for dual control applications.
The STC logo and the commercial Type designation of S6F33.
The valve features screens above and below the mica discs and the control grid supports have a heat radiating fin at the top. The presses anode is formed into two plates and a strap.
The thin glass tube envelope is 18 mm in diameter, and excluding the base pins is 45 mm tall.
Reference: Data-sheet. Type CV4064 was first introduced in 1956. See also1956 adverts.
