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The CV2721 is the EL81 badged for the UK Government. It was designed as a television line output stage valve from the era of monochrome 405 line VHF television. The CV2721 is specified for a peak positive anode surge of 7,000 Volts.

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.

See also PL81

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 71 mm tall.

References: Data-sheet & ¹⁰⁴⁰.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.