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R5_Osram

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ID = 28730
       
Country:
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to R5_Osram

Base IS-1 (Interservice, UK 1918)
Was used by Military and/or Government
Filament Vf 3.6 Volts / If 0.65 Ampere / Direct / Battery =
Description Uf max. = 3.9 Volts. British Navy version NR5. R5 also made by Cryselco Lamp Company 
Dimensions (WHD)
incl. pins / tip
x 85 x 31 mm / x 3.35 x 1.22 inch
Weight 29 g / 1.02 oz
Information source Saga of the Vacuum Tube, Tyne   page 220, 221, 222
British Radio Valves - The Vintage Years: 1904-1925   Pages 39 & 40

is1_base~~2.png R5_Osram: Fin Stewart
Fin Stewart

Collection of

 
screenshot_20230102_123008_gallery.jpg

R5_Osram
 

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