- Item type
- Object
- Provenance
- Presented by the Marconi Corporation.
- Primary inscriptions
- "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.
- Object type
- Radio valve
- Dimensions
- Height: 170mm
- Inventory No
- 64933
- Accession Number
- 2004-9/475
Description
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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