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ID = 72796
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  CRT (cathode ray tube, picture tube)   Indication 
  <1925 no serial production. For instance only development samples. *****
Identical to A_CRT
First year 1929 - - Manufacturers Literature Ediswan 1970
Successor Tubes 1970   B_CRT  

Base Europe 4-Pin (A, 4A, B4, since 1914) Side contacts
Was used by Radio/TV-reception etc.

This 4 inch, gas focussed CRT was the experimental version of the "B" CRT released in 1930.

Literature - - Manufacturers Literature   Ediswan 1970

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