The CV337 (commercially the 931A) is a photomultiplier based on the VX6046 prototype. One use of this device was as a noise source for jamming equipment.
Operating conditions: an anode voltage of 100 V and a cathode current of 0.025 mA. The gain is 1,000,000 and the sensitivity is 10A/Lumen at a wavelength of 420 nM.
The KB/E identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the E identifies the maker as Thorn-AEI, Brimsdown.
The entry window winding.
The entry window. The multiplier dynodes are not visible.
The wide glass tube envelope is 28 mm in diameter, and excluding the base pins is 74 mm tall.
