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ID = 48056
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to R4_Osram
Similar Tubes
Normally replaceable-slightly different:
Successor Tubes R4A  

Base Edison (candelabra) 12 mm Wires only.
Was used by Military and/or Government
Filament Vf 3.3 Volts / If 1 Ampere / Direct / Battery =

Developed from the R Type. The R4 was a hard vacuum tube. The Naval version is the NR4. First made by Osram GEC June 1917. This tube led to the development of the R4A, R4B and R4C types

Dimensions (WHD)
incl. pins / tip
50 x 86 x mm / 1.97 x 3.39 x inch
Weight 32 g / 1.13 oz
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 26, 27, 40 & 86
Saga of the Vacuum Tube, Tyne   Pages 220 & 221

Collection of



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