Summary
NR7 triode. The NR7 is the British Navy's designation for the Royal Air Force's R7 type.
Manufacturer: M.O. Valve Company, England.
Used on H.M.S. "Renown" on her visit to Australia with the Prince of Wales in 1920. Marked "manufactured by the M.O. Valve Company Ltd., G.E.C. Made in England.
Admiralty pattern with horizontal electrodes. Terminals pattern with horizontal electrodes. Terminals top and bottom on each side of base. Plate volts 150, filament volts 4 at 0.5 amp. Admiralty patterns 5427.n.r.7, 47749".
Physical Description
Tubular bulb mounted on special base with top cap connected to base by a copper strip and mounted on small display block.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Stromberg-Carlson Co., 28 Aug 1935
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Manufacturer
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Inscriptions
Bulb: ADMIRALTY/PATT.5427/N.R.7/47749/MANUFACTURED BY MO. VALVE CO/G.E.C/MADE IN ENGLAND
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
82 mm (Height), 32 mm (Outside Diameter)
Dimensions of valve, excluding display block.
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References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 221 Pages
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