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ID = 70643
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to U18/20
Predecessor Tubes U20_MOV   U18  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2.8 Ampere / Direct / Specified voltage AC/DC

Replaces the types U18 and U20.

Va <2.4kV with Ia <400mA peak with reservoir C 8µFor <1.4kV if Ia < 750mA peak with C 16µF.

Dimensions (WHD)
incl. pins / tip
56 x 135 x mm / 2.20 x 5.31 x inch
Information source - - Manufacturers Literature   
U18/20: Eigenes Bild
Anonymous 740 Collector

More ...
U18/20: own collection
Peter den Boer

from Just Qvigstad

Collection of a member from D

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