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The CV4014 is a UK service designation for the civilian A3064 or M8083 or 6064 (as this valve is also marked), 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 CV4014 has the distinctive blue band of the Mullard / Philips production. This example has two silvery stripes to prevent release of gas from the glass.

The KB/FD identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the FD identifies the maker as STC, Rochester.

The glass protection hides the inner structure.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 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.