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Marconi Radio Valve Type D42, by Marconiphone Company, England, 20th Century

Inventory Number: 80037

80037-2t 80037-1t

Date: 20th Century

Maker Details: Signed by the Marconiphone Co. Ltd.

Inscription: "THE MARCONIPHONE CO. LTD. / MARCONI / B.V.A." printed on transfer stuck to exterior surface of bulb. "D42 / MADE & PATENTED / IN ENGLAND" printed on exterior surface of bulb.

Size: 80 mm in overall length (including base pins)

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

Other Given Number(s): Christie's 215.


Marconi Radio Valve Type D42, in glass balloon envelope. With partially silvered surface, probably due to manufacturing process. Upon polished black bakelite? base with four steel base pins. Marconiphone Co. Ltd. was founded in December 1923 so valve can be dated post-1923.

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