- Item type
- Object
- Provenance
- Presented by the Marconi Corporation.
- Object type
- Radio valve
- Dimensions
- Height: 35mm Width: 55mm Depth: 30mm Weight: 0.05kg
- Inventory No
- 96640
- Accession Number
- 2004-9/204
Description
Osram-GEC Soft Triode Radio Valve Type R4, with bulb-shaped glass exterior, brass fittings and a teak? mounting. With cylindrical anode threaded by helical grid with an interior single-strand wire filament, made of tungsten. In use filament would burn brightly similarly to a light bulb. This particular example was used by the Admiralty as a receiving valve, and technically should be given the designation Type NR4, but is referred to under its common designation of Type R4.
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