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ID = 51329
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes   RF/IF-Stage 
Identical to VT149 = ARP38 = CV1343

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 4 Volts / If 0.25 Ampere / Indirect
Description Metallised glass body.
British GPO code, not to be confused with US military VT-149, which is a diode-triode-pentode.
Refer to the spec CV1343. 
Information source -- Original-techn. papers.   

vt149_gpo.png VT149
Emilio Ciardiello

Just Qvigstad
VT149: Manufacturer's Literature
Emilio Ciardiello

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