- Item type
- Object
- Makers
- Mullard
- Provenance
- Presented by the Marconi Corporation.
- Primary inscriptions
- "MULLARD RADIO VALVE / 36" stamped on one side of exterior surface of bulb. "BBC / PROTECTED BY PATENT / 254" stamped on other side of exterior surface of bulb.
- Object type
- Radio valve
- Dimensions
- Diameter: 25mm Height: 75mm
- Inventory No
- 18833
- Accession Number
- 2004-9/193
Description
Mullard Radio Valve Type ORA/B, in thin glass envelope. ORA stands for Oscillator, Rectifier, and Amplifier. Valve was of bright emitter type and had a mu (amplification factor) of 8.5. In construction, valve has a rubber? skirt and familiar tubular anode. Grid is of curved folded arrangement and has single strand filament, tensioned by support arm. Previously catalogued with five other valves: Marconi Type Q Valve (Inv. Num. 33191), Marconi Type V24 Valve (Inv. Num. 35245), Marconi DEV Valve (Inv. Num. 15771), Marconi DEQ Valve (Inv. Num. 74920), Marconi FE2 Valve (Inv. Num. 92775).
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