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ID = 80157
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Double Triode 
  <1925 very rare. ***
Identical to Es220
Similar Tubes
Multiple differences or of other kind:

Filament Direct / 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 1 
Literature Bulletin of the British Vintage Wireless Society (BVWS, 73)   

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