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BM42B

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ID = 18125
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Current Regulator, Iron in Hydrogen 
Identical to BM42B
Filament If 0.3 Ampere
Information source Taschenbuch zum Röhren-Codex 1948/49   
Ballast-Tube Handbook; Jacobi 1985   
0_ball_33_27.png BM42B
Emilio Ciardiello
Usage in Models 1= 1938 ; 5= 1939? ; 1= 1940?? ; 5= 1940? ; 1= 1942?? ; 1= 1942?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):14
 
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