Antique radios, Old Time Radios
R_Osram
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Country:
Great Britain (UK)
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| Identical to |
R_Osram
= RAF
= TM
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| Similar
Tubes |
Other shape (e.g. bulb type):
R_England
Normally replaceable-slightly different:
RA_Mullard
; VT3_GPO
Other base:
VT4_GPO
|
| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 4 Volts / If 0.65 Ampere / Direct / Battery = |
| Description |
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)
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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)
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| 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
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R_Osram: rtt
Anonymous 10 Collector
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Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
Collection of
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