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ID = 49303
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   RF/IF-Stage 
  Ca. 1925 up to 1945 very rare. ***
Identical to CV1150 = 7406 = NR14

Base IS-1 (Interservice, UK 1918)
Was used by Military and/or Government
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Specified voltage AND current AC/DC

This tube is an updated version of the British Navy NR14. Obsolete since 1946. The tube uses a rectangular element assembly and has a mica insulation strip at the top of the element structure, to space the components. The tubes usually showed both type numbers.

Dimensions (WHD)
incl. pins / tip
x 75 x 30 mm / x 2.95 x 1.18 inch
Information source -- Original-techn. papers.   
Babani, International Radio Tube Encyclopaedia   Pages 72 & 73
-- Collector info (Sammler)


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