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B5H

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ID = 28416
       
Country:
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to B5H
First year 1923 Saga of the Vacuumtube, Tyne 389
First Source (s)
1926 : British Radio Valves - The Vintage Years, Thrower p.47

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 2.8 Volts / If 0.06 Ampere / Direct / Battery =
Description for RF amplification.

Va range 40 to 120
Ra = 55,000, µ=17.5 
Text in other languages (may differ)

Literature - - Manufacturers Literature   Advertisement February 1927
 

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