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Marconi-Osram Radio Valve Type MPT4, by Marconi Company, London, Late 1920s

preview image for Marconi-Osram Radio Valve Type MPT4, by Marconi Company, London, Late 1920s
Inventory Number: 84752
Object Type:
Place Created: London United Kingdom (England) Europe
Accession Number: 2004-9/360
Brief Description: Marconi-Osram Radio Valve (or Tube) Type MPT4 with mostly silvered glass balloon envelope, polished black plastic? base and five steel base pins. Cathode is a flattened tube and the two inner grids are shaped to have a central bulge and then flatten towards the support rods. Grid three is a open wire helix near to the anode cylinder and far away from the inner grids.
Primary Inscriptions: "Marconi / Valve / B.V.A." printed on sticker attached to exterior surface of bulb. "MADE IN ENGLAND / T / MPT / 4 / PATENTED" printed on top exterior surface of bulb. "MOV CO LTD" printed on underside of base.
Provenance: Presented by the Marconi Corporation.
Collection Group: Marconi Collection
Material(s): Glass
plastic?
steel
assorted metals.
Dimensions:
Height Width Depth Diameter Unit
130 60 mm

Narratives

Image with multimedia irn 39953Image with multimedia irn 39954

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