Cosmos valve

Made:
1920s in England
maker:
Metropolitan-Vickers Electrical Company Limited

Metropolitan-Vickers Cosmos valve SP18;

The Cosmos short path valves SP-18 were introduced in 1925 all had thoriated tungsten filaments and thus were dull emitters. SP-18 Blue, this variant was introduced in about 1926.

Details

Category:
Radio Communication
Object Number:
Y1984.48.296
Materials:
cardboard, glass, metal (unknown), plastic (unidentified)
type:
valve
taxonomy:
  • object genre
  • component parts
  • mechanical component
credit:
Gift of Dr. G. R. Airth
status:
Permanent collection

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