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ID = 28992
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 ARDE_LF
Similar Tubes
Normally replaceable-slightly different:
First year 1923 Saga of the Vacuum Tube, Tyne page 373
First Source (s)
1925 : History of the British Radio Valve to 1940 p. 158

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 1.8 Volts / If 0.3 Ampere / Direct / Battery =

First made in 1924, 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 overtime, in many cases, the stripe has worn off..

Information source British Radio Valves - The Vintage Years: 1904-1925   P. 50, 87 & 115

b4_base_pins~~218.png ARDE_LF: Fin Stewart
Fin Stewart

Just Qvigstad
ARDE_LF: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector


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