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The CV4010 is the UK Government code for the commercial M8100 which in turn is Mullard's special quality version of the EF95. It is an RF pentode for VHF and above. The CV specification gives the prototype as the VX8100 and that other Type designations for the valve are 5654, 6AK5W and 6096.

A flying lead version was made and named the CV4050.

The anode is 9 mm square and 6 mm deep. On the 6mm face is a circular hole revealing the electrode structure. The g2 helix has 4.5 turns to each single gentle turn of the g3 helix. G3 is internally connected to the cathode. The heater is a coil of fine wire, covered in insulation, that is folded into a hairpin and gently twisted.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 36 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV4010 was first introduced in 1948. See also 1948 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.