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The CV1053 is a variable-mu RF pentode, with variable screen characteristics, for use as a controlled RF or IF amplifier. The frequency range of operation would be up to 30 MHz. The Mullard EF39 was the prototype.

The KB/DA identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the DA identifies the maker as Mullard Radio Valve Co., Blackburn.

The GPO sampled print indicates the use in telephone distribution. Before the valve was known as the CV1053, the GPO specification would be POVT180.

The classic envelope is 29 mm in diameter and excluding the IO base pins it is 85 mm long.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type CV1053 was first introduced in 1939. See also 1939 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.