- Item type
- Object
- Makers
- Ediswan
- Provenance
- Presented by the Marconi Corporation.
- Primary inscriptions
- "MARCONI'S W.T. CO. LTD. / PAT APPN. ______" stamped vertically on exterior surface of bulb. "Q" stamped horizontally on exterior surface of bulb.
- Object type
- Radio valve
- Dimensions
- Diameter: 25mm Height: 75mm Weight: 0.05kg
- Inventory No
- 33191
- Accession Number
- 2004-9/189
Description
Marconi Radio Valve Type Q, with distinctive wire mesh cage grid. Grid is made of longitudinal wires with interwoven helical wire, all supported on rectangular wire frame. Filament is not clear but should be a single strand filament running the length of the valve and tensioned by a spring. With complete filament, and plain metal cylinder anode taken to one of the side connections. Previously catalogued with five other valves: Marconi Type V24 Valve (Inv. Num. 35245), Marconi DEV Valve (Inv. Num. 15771), Marconi DEQ Valve (Inv. Num. 74920), Mullard ORA/B Valve (Inv. Num. 18833), Marconi FE2 Valve (Inv. Num. 92775).
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