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Record Details

Osram-GEC Radio Valve Type R4, by Osram-GEC, English, 1917

Inventory Number: 96640
Object Type:
Place Created: England United Kingdom Europe
Accession Number: 2004-9/204
Brief 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.
Provenance: Presented by the Marconi Corporation.
Collection Group: Marconi Collection
Material(s): Teak?
assorted metals.
Height Width Depth Diameter Unit
35 55 30 mm


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