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B4_BTH

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ID = 28089
       
Country:
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Developer: BTH (B.T.H.), British Thomson-Houston Co, Ltd. 
Tube type:  Triode, vacuum   Power/Output 
  <1925 rare.
Identical to B4_BTH
First Source (s)
1923 : Saga of the Vacuumtube, Tyne
1923 : British Radio Valves - The Vintage Years, Thrower p.45

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 6 Volts / If 0.25 Ampere / Direct / Battery =
Description Va <120. Made at the Mazda Lamp Works. 
Literature - - Manufacturers Literature   1925 Brown Brothers Catalog 217
- - Manufacturers Literature   not dated
 
b4b.t.h.britishthomson-houstonco_3_klein.jpg
B4_BTH
Geri Meier

 
b4_bth_spec.png
B4_BTH: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector


Usage in Models 1= 1925

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



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