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S4021B

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ID = 59989
       
Country:
Sweden
Brand: Standard Radiofabrik A.B.; Ulvsunda
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 very rare. ***
Identical to S4021B
Similar Tubes
Other base:
  S4021A ; SY4021A
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Telephony
Filament Vf 4 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~~6.png S4021B: Fin Stewart
Fin Stewart

Just Qvigstad 		s4021_b_characteristics_2.png
S4021B: My schematic collection.
Pier Antonio Aluffi
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