- Item type
- Object
- Makers
- Osram
- Provenance
- Presented by the Marconi Corporation.
- Primary inscriptions
- "OSRAM / MADE IN / ENGLAND" on one side of exterior surface of valve. "R / 249" on other side of exterior surface of valve.
- Object type
- Radio valve
- Dimensions
- Diameter: 55mm Height: 115mm
- Inventory No
- 80773
- Accession Number
- 2004-9/203
Description
Osram Triode Radio Valve Type R, example of early Type R; probably produced in late WW1. Made by Osram before the formation of Marconi-Osram Valves in 1919. Cylindrical anode threaded by helical grid within which passes single strand of Tungsten wire as filament. In use filament would burn brightly just like a light bulb. With brass? base and steel base pins. Previously catalogued with three other Type R Radio Valves (Inv. Num.s 94475, 22908, 82041).
Related Items
More related items
Osram Radio Valve Type P2, by Osram Company, English, 20th CenturyInventory Number 57431
Osram-GEC Radio Valve Type R4, by Osram-GEC, English, c. 1916Inventory Number 59017
Osram-GEC Radio Valve Type R4, by Osram-GEC, English, 1917Inventory Number 96640
Osram Radio Valve Type CM8, by Osram Company, English, 20th CenturyInventory Number 79293