Strictly speaking the '10E/' and '110E/' designations added to the valve were WW2 RAF Stores identities rather than valve types. No doubt boots, berets and ration packs all had identities in the same universal system. The valve shown above looks like an American Type 866 (MV) rectifier rated at 250 mA and 10 kV PIV.

Visual inspection shows spots of mercury on the inside of the envelope and identifies this as a half wave mercury vapour rectifier. The spacing of the electrodes and the ceramic top cap insulator all point to a voltage rating of 1000 Volts plus.

The classic envelope is 55 mm in diameter and, excluding the B4 base pins, is 150 mm tall.

 
Pin Connections

B4	1	2	3	4	tc
	f	ic	ic	f	a

 
Absolute Maximum Operating Conditions

Rectifier	Vh	Ah	Va	mAa
	2.5	5.0	2650	500

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 02 February 2008 {find valves by name}