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AR_HF

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

Base Europe 4-Pin (A, 4A, B4, since 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 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.

 
Literature British Radio Valves - The Vintage Years, Thrower   Pages 30 & 115
 
ar_pic.jpg
AR_HF: Nesper, 1924
Anonymous 15 Collector

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


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