The CV2231 is a pulse modulator pentode based on the E2266. The non CV reference is an experimental valve from M-OV.
The design allows for a 15% duty cycle and a maximum pulse length of 15 μs. Under these conditions the peak anode voltage can rise to 10,000 Volts and the peak current is 2.5 A. In addition to an anode maximum dissipation of 12 Watts the screen grid can dissipate 3 Watts.
An additional function that the valve can be used for is as a shunt voltage regulator. In this application the maximum anode voltage is 6,000 Volts. Given the high cathode current of 120 mA and DC voltage of 600 Volts this valve could also be used as a series voltage regulator. SeePL81 as another valve suitable for series pass duty.
The physical construction features ceramic insulators and radiator fins attached to the top of the grid. The anode is also blackened for enhanced radiation efficiency.
The KB/Z identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the Z identifies the maker as MO Valve Company, Hammersmith.
The GEC sticker indicating a valve branded for professional equipment use. The radiating fins can be seen above the top mica on the copper supports of the control grid.
The anode seam and ceramic insulators.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 73 mm tall.
