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ID = 28083
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to R_BTH
Similar Tubes
Other shape (e.g. bulb type):
First Source (s)
1916 : British Radio Valves - The Vintage Years, Thrower p.24,25

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.63 Ampere / Direct / Battery =

Originally made with a 55 mm diameter bulb. Some BTH R tubes have beeb found with a vertical element assembly. later tubes c. 1922-25 had tapered bulbs approx. 40 mm diametera<100

Dimensions (WHD)
incl. pins / tip
x 118 x 55 mm / x 4.65 x 2.17 inch
Tube prices 1 Tube prices (visible for members only)
Literature - - Manufacturers Literature   1925 Brown Brothers Catalog 217
Saga of the Vacuum Tube, Tyne   Pages 217-219
R_BTH: 290998507378 Ebay item
Clive Forder

Konrad Birkner † 12.08.2014

R_BTH: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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