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The CV4014 is a UK service designation for the civilian M8083 or 6064, this in turn is a special quality version of the EF91 CV138. The M8083 has a more rugged build than the EF91 and was designed for operation in areas of vibration especially aircraft.

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.

Unlike the EF91, the CV4014 has an internal screen - seen as bright in the image. The anode strap joining the two small anode plates is on the outside of this screen. Under a glass it is just possible to see the grids.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV4014 was first introduced in 1953. See also 1953 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.