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ID = 13910
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Developer: Hivac Ltd.; Harrow-on-the-Hill 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 very rare. ***
Identical to CV176 = VT178_GPO = CV1721
Similar Tubes
Normally replaceable-slightly different:

Base Midget 4 pin Hivac (Sm4)
Was used by Military and/or Government
Filament Vf 1.5 Volts / If 0.066 Ampere / Direct / Specified voltage AND current AC/DC

This tube dsigned for last audio stage

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 Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   Pages 78-79
Universal Vade-Mecum, Electron Valves and Semiconductor Devices

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