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ID = 66845
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Developer: Hivac Ltd.; Harrow-on-the-Hill 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to XH

Base Midget 4 pin Hivac (Sm4)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.66 Ampere / Direct / Battery =

This tube can be used in hearing aids

Dimensions (WHD)
incl. pins / tip
x 63 x 16 mm / x 2.48 x 0.63 inch
Weight 13 g / 0.46 oz
Information source -- Collector info (Sammler)   Wireless World October 1951
- - Manufacturers Literature   
XH: Fin Stewart
Fin Stewart

XH: Wireless World October 1951
Jacob Roschy

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