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Marconi-Osram Radio Valve Type DET 1A, by Marconi Company, London, 20th Century

Inventory Number: 64933

64933-2t 64933-1t

Date: 20th Century

Maker Details: Signed by Marconi-Osram Valve Co. Ltd.

Inscription: "MARCONI OSRAM VALVE / MADE AT THE OSRAM LAMP WORKS / COVERED BY VARIOUS PATENTS / MADE IN ENGLAND / Y" printed on the exterior surface of bulb. "DET1A / 22" printed on the exterior surface of the bulb.

Size: 170 mm in overall height (including base pins)

Materials: Glass, nickel-plated, brass, plastic?, assorted metals.

Other Given Number(s): Christie's 214, Science Museum Loan 1936-281.


Marconi-Osram Radio Valve (or Tube) Type DET 1A, with large glass balloon envelope. Unusual form of base: square red composition base with brass? base pins at four corners. With vertically-mounted nickel-plated anode and interior filament. Previously catalogued with Siemens & Haske Radio Valve Type RE87 (Inv. Num. 69068), GPO Radio Valve Type No 2 (Inv. Num. 26614).

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