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ID = 14550
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Triode, vacuum   RF/IF-Stage 
  <1925 very rare. ***
Identical to NR14 = CV1150 = 7406

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
Description This tube was designed for the British Navy and has the "Interservice" IS-1 so called "acorn" base incorporating one filament cap and the anode and grid connections from brass plates. The anode is identified with a red circle adjacent to the anode plate. the other filament connection is from the top cap. Used in the Gambrell Bros note Magnifier. Made by MOV and Edison-Swan 
Dimensions (WHD)
incl. pins / tip
x 75 x 30 mm / x 2.95 x 1.18 inch
Information source - - Data from my own collection   
Taschenbuch zum Röhren-Codex 1948/49   
Taschenbuch zum Röhren-Codex 1951

is1_base~~1.png NR14: Fin Stewart
Fin Stewart

Usage in Models 1= 1925

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of



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