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ID = 49100
Brand: Mars; Arnhem
Developer: Mars; Arnhem 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to B135

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 3.5 Volts / If 0.12 Ampere / Direct / Battery =
Description Amplification=8.7, slope=0.25 mA/V, internal resistance=7900. 
Information source Radio-Expres, Netherlands   18-6-1926

3_b4~~2.png B135: own collection
Peter den Boer

Just Qvigstad

Collection of



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