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S4019A

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ID = 61849
       
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 S4019A
Similar Tubes
Other base:
  4019A ; SY4019A
Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Telephony
Filament Vf 4 Volts / If 0.25 Ampere / Direct / Specified voltage AND current AC/DC
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 bayonet", but does not say which style - (UX or UV)

 
Dimensions (WHD)
incl. pins / tip		 x 118 x 57 mm / x 4.65 x 2.24 inch
Weight 65 g / 2.29 oz
Information source - - Manufacturers Literature   Sept. 1950
uv~~54.png S4019A: Fin Stewart
Fin Stewart

Just Qvigstad 		s4019_a_b_characteristics_1.png
S4019A: My schematic collection.
Pier Antonio Aluffi
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