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ES220

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ID = 80157
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Double Triode   RF/IF-Stage 
  <1925 very rare. ***
Identical to ES220
Similar Tubes
Multiple differences or of other kind:
  VT126

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.075 Ampere / Indirect / Battery =
Description

This tube was designed by Ediswan in the ONE-DER receiver made by the company. The tube was not used anywhere else and is not listed in any company literature. A brochure for the radio states "It must be understood that this valve is primarily designed as a single valve loud speaker receiver . and it is no sense a wireless receiver". See BVWS articles in Volume 5, No 4, Volume 10, no 4 and Volume 24, No. The tube was used as a Detector triode and AF triode 1

 
Information source Bulletin of the British Vintage Wireless Society (BVWS, 73)   
British Radio Valves - The Classic Years: 1926-1946   Supplement, p. 32


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