The CV4007 and the commercial 6097 is a miniature all glass premium quality pair of signal diodes. The Mullard Type is M8212 also on the envelope.
The design was for detector service in wide band equipment. This would typically be RADAR. The premium version is designed to be used in areas of shock and vibration such as aircraft equipment.
The prototypes were the VX7129 and CV283. The CV4007 is identical to the 5726, 6AL5W and 6097. The domestic version of these diodes was the 6AL5 and here the use was television video detector.
The two diodes are completely separate flat structures separated by a flat metal screen.
The KB/DC identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the DC identifies the maker as Mullard Radio Valve Co., Whyteleafe.
The Mullard logo and the Type designation M8212.
Typical construction of a signal diode.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 37 mm tall.
Reference: Data-sheet. Type CV4007 was first introduced in 1952. See also1952 adverts.
