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ES4

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ID = 28555
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to ES4
Similar Tubes
Normally replaceable-slightly different:
  R_Marconi
First year 1921 Saga of the Vacuumtube, Tyne page 372, 373, 395

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 1920, this tube was designed by John Scott-Taggart and was similar in appearance and characteristics to the R tube. While working for a year from 1919 to 1920, as head of the tube department of Edison-Swan, He designed the ES2 and ES4 tubes. He left to further his radio interests elsewhere. Over the next few years he designed other tubes and some of these were made fior him by Mullard. He was a well known author during (and after) World War One and he was in various signals units of the British Army. He was also a technical officer involved in radar training and maintenance in World War Two.

With 1 amp at 6 v to the filament and up to 1000 v at the plate it could be used as a transmitter up to about 30 watts!

 
Text in other languages (may differ)
Literature Saga of the Vacuumtube, Tyne   Pages 372, 373 & 395
British Radio Valves - The Vintage Years, Thrower   Page 31
 
royalediswan_es4.jpg
ES4
Otto Frosinn

 


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