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B7_BTH

Information - Help 
ID = 28091
       
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 B7_BTH
First Source (s)
1924 : Saga of the Vacuum Tube, Tyne
1924 : British Radio Valves - The Vintage Years, Thrower p.47

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 6 Volts / If 0.06 Ampere / Direct / Battery =
Description Va <120. "Made at the Mazda Lamp Works. For Use with Dry Cells". BTH Advertisement 
Information source - - Manufacturers Literature   1925 Brown Brothers Catalog 217
 
bth_b7.jpg
B7_BTH: Wireless World No. 303. WEDNESDAY, JUNE 3RD, 1925. VOL. XVI. No. 17 p.549
Thomas Günzel

 
b4_base_pins~~109.png
B7_BTH: Fin Stewart
Fin Stewart

 
bth_b7.png
B7_BTH: Wireless World No. 303. WEDNESDAY, JUNE 3RD, 1925. VOL. XVI. No. 17 p.549
Thomas Günzel


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