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The CV4020 shows the final design format of the valve voltage stabiliser. The CV4020 would strike at 165 volts and the regulation would be 5 Volts for changes in current of 5 - 30 mA.

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.

The thin glass tube envelope is 18 mm in diameter and, excluding the B9A base pins, is 58 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV4020 was first introduced in 1955. See also 1955 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.