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The CV4006 is the UK government procurement specification for the commercial 6059 which is itself a special quality version of the type 6BR7. The specification gives the prototype as the VX7081. The valve was carefully designed for low internal noise and, especially, for low internal hum pick-up from the 6.3V AC heater, thus making it unnecessary to provide a DC source of heater current.

See 6BR7 for more details.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 45 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV4006 was first introduced in 1957. See also 1957 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.