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S4020A

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ID = 59990
       
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 S4020A
Similar Tubes
Other base:
  4020A ; S4020B ; SY4020A

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Telephony
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Battery =
Description

Telephone repeater tube. Refer Museum ID 16379 - S4021A fitted with UX 4 pin base. Manufacturers literature states base for this tube is "Med. 4 pin" but does not say which style (UX or UY).

 
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

uv~~28.png S4020A: Fin Stewart
Fin Stewart


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