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The CV2730 is an electrometer tetrode with a very high input impedance for sensitive measuring instruments such as pH meters. The commercial equivalent is the Mullard ME1402.

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.

See ME1402 for details.

The thin glass tube envelope is 9 mm in diameter and, excluding the base leads is 44 mm tall.

References: Data-sheet in ⁴⁰³²