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S4020B

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ID = 59991
       
Country:
Sweden
Brand: Standard Radiofabrik A.B.; Ulvsunda
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 very rare. ***
Identical to S4020B
Similar Tubes
Other base:
  4020A ; S4020A ; SY4020A

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Telephony
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Battery =
Dimensions (WHD)
incl. pins / tip
x 116 x 57 mm / x 4.57 x 2.24 inch
Weight 65 g / 2.29 oz
Information source Babani, International Radio Tube Encyclopaedia   
- - Manufacturers Literature   Sept 1950

b4~~5.png S4020B: Fin Stewart
Fin Stewart


Just Qvigstad
 

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