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ID = 57572
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Triode, vacuum   RF/IF-Stage 
  <1925 very rare. ***
Identical to AR_MOV

Base IS-3 (Interservice, UK 1918)
Was used by Military and/or Government
Filament Vf 2 Volts / If 0.4 Ampere / Direct
Description British Army tube (Army Receiving). Known to be made by MOV, Ediswan, BT-H and Mullard. The IS-3 base used on this tube was a molded ebonite "box" with a long "slide" contact on each side. One was unused and the other connected to the anode. The base had three studs on the bottom. Two for the filament and one for the grid connection. 
Dimensions (WHD)
incl. pins / tip
25 x 80 x mm / 0.98 x 3.15 x inch
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 44, 45 & 86


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