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ID = 27382
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to R_Osram = RAF = TM
Similar Tubes
Other shape (e.g. bulb type):
Normally replaceable-slightly different:
  RA_Mullard ; VT3_GPO
Other base:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Direct / Battery =

copy of french TM during WW1. A "hard" tube, first made by the Osram Lamp Works September 1917. Also made in England by B.T.-H., ..Metropolitan Vickers (Cosmos), A.C.Cossor Ltd, Cryselco Electric Lamp Company, Edison-Swan, Mullard Radio Valve Company, Marconi Wireless and Telegraph, Stearn's Electric Lamp Company and H.W.Sullivan Ltd. An Osram R tube exists with a factory fitted American "Shaw"-UV base. The Tube was known as VT4 in the British Post Office. British Navy version NR12. The Osram brand was discontinued on this tube with the formation of the Marconi Osram valve Co in 1919. Late in 1925 the company used bakelite bases for the tube

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 118 x 54 mm / x 4.65 x 2.13 inch
Weight 52 g / 1.83 oz
Tube prices 6 Tube prices (visible for members only)
Information source -- Collector info (Sammler)   
Saga of the Vacuum Tube, Tyne   Pages 170-172, 217-221,380
70 Years of Radiotubes and V.
British Radio Valves - The Vintage Years: 1904-1925

r_osram_so.png R_Osram: rtt
Anonymous 10 Collector

Just Qvigstad
Usage in Models 1= 1924

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

Collection of



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