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AR_LF

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ID = 30728
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to AR_LF
First Source (s)
1922 : History of the British Radio Valve to 1940 p. 155
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.75 Ampere / Direct / Battery =
Description

First made in 1925, this tube has a green stripe painted on the side of the glass, from the base to the tip. This indicates that the tube is for Low Frequency use. The stripe measures about 3 mm wide and over time, in many cases, the stripe has worn off.

 
Dimensions (WHD)
incl. pins / tip		 x 110 x 35 mm / x 4.33 x 1.38 inch
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 30 & 115
b4_base_pins~~212.png AR_LF: Fin Stewart
Fin Stewart

Just Qvigstad 		arlf_spec.png
AR_LF: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector
 
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