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866

Sensibly equivalent to:
2V/400A 866A CV2677 ESU866
See also:
Ediswan Rectifier & Power Triode Advert
    
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Strictly speaking the '10E/' and '110E/' designations added to the valve were WWII 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.
References: Private Communication & datasheet.

 

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 PDF datasheet.
Updated December05, 2012.
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