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ID = 48322
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Transmitting Triode, air cooled   VHF 
  Ca. 1925 up to 1945 very rare. ***
Identical to VT121A_GPO = CV1288 = NT58 = CV1235 = VT62_GB = 8019
Similar Tubes
Normally replaceable-slightly different:
  CV315 ; DET12
Other base:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 2 Top contacts.
Was used by Telephony
Filament Vf 7.5 Volts / If 3 Ampere / Direct / Specified voltage AND current AC/DC
Dimensions (WHD)
incl. pins / tip
x 175 x 60 mm / x 6.89 x 2.36 inch
Weight 72 g / 2.54 oz
Information source -- Original-techn. papers.   
-- Collector info (Sammler)   
VT121A_GPO: Fin Stewart
Fin Stewart

VT121A_GPO: Manufacturer's Literature
Emilio Ciardiello

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