The CV3526 (commercially the EL85)is the little brother of the EL84 pentode. It is specified for single ended audio applications with a load resistance 9000Ω. This could be used in radio or television receivers it is also an RF amplifier up to 100 MHz.
The KB/D identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the D identifies the maker as Mullard Radio Valve Co., Mitcham.
Through the slots in the side of the anode the wire grids can be seen. The suppressor grid can only be seen at the top as a wire passing to the right.
The working face of the anode has small flanges at the centre. The control grid is, as usual, wound on copper support rods for good heat transference to the radiating fins at the top.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 57 mm tall.
References: Data-sheet & 1040. Type CV3526 was first introduced in 1954. See also1954 adverts.
