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R_BTH

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ID = 28083
       
Country:
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):
  R_England
Normally replaceable-slightly different:
  RA_Mullard
First Source (s)
1916 : British Radio Valves - The Vintage Years: 1904-1925 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 =
Description

Originally made with a 55 mm diameter bulb. Some BTH R tubes have been 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)
Information source - - Manufacturers Literature   1925 Brown Brothers Catalog 217
Saga of the Vacuum Tube, Tyne   Pages 217-219
b4~~4.gif R_BTH: KoBi
Konrad Birkner † 12.08.2014

Just Qvigstad 		r_bth_spec.png
R_BTH: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector
 
british_thomson_houston_r.jpg

R_BTH
 
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