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ID = 28399
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_HF
First year 1922 Saga of the Vacuum Tube, Tyne Seite 373
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 =

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

Information source British Radio Valves - The Vintage Years, Thrower   Pages 30 & 115
AR_HF: Nesper, 1924
Anonymous 15 Collector

AR_HF: Fin Stewart
Fin Stewart

AR_HF: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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