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Mullard Radio Valve Type ORA/B, by Mullard Radio Valve Company, c. 1922

Inventory Number: 18833
Object Type:
Accession Number: 2004-9/193
Brief 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).
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.
Provenance: Presented by the Marconi Corporation.
Collection Group: Marconi Collection
Material(s): Glass
assorted metals.
Height Width Depth Diameter Unit
75 25 mm

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