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Ediswan Radio Valve Type ATP4 With Carton, by Ediswan, London, Mid 20th Century

Inventory Number: 22414

22414-2t 22414-1t 22414-3t 22414-4t

Date: Mid 20th Century

Maker Details: Signed by Siemens Edison Swan Ltd.

Inscription: "EDISWAN / RADIO VALVE" printed on front of carton surface. See Documents for other inscriptions.

Size: 110 mm in overall length (including top caps and base pins)

Materials: Glass, steel, plastic?, assorted metals.

Other Given Number(s): Christie's 216.


Ediswan Radio Valve (or Tube) Type ATP4, in red, black, white and black printed cardboard carton. Glass valve with single steel top cap, black plastic? base, nine steel base pins, and one central black plastic? base pin. One steel pin missing. Bottom of valve is blackened, probably from use. With BVA (British Radio Valve Manufacturers Association) logo stamp on carton exterior.

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