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S4021A

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ID = 16379
       
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 S4021A
Similar Tubes
Other base:
  4021B ; S4021B
Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Telephony
Filament Vf 4 Volts / If 0.25 Ampere / Direct / Battery =
Description

Telephone repeater tube. Refer to photograph of tube. It is shown with a UX 4 pin base. Manufacturers literature shows the base for this tube is "Med. 4 pin" but does not show what style (UX or UV). All 4 Standard tubes (4019A, 4020A, 4021A and 4022AR) made by other factories (England and Australia) had the UV base.

 
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 Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   
- - Manufacturers Literature
uv~~29.png S4021A: Fin Stewart
Fin Stewart

Just Qvigstad 		s4021_a_characteristics_2.png
S4021A: My schematic collection.
Pier Antonio Aluffi
More ...

Collection of

David Pfister (CH)
 
s4021a.jpg

 
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