Summary
AR triode. General purpose triode. Manufacturer: Edison Swan Electric Co., England, released in 1922.
The AR was introduced in 1922 and the use of the word 'Royal' in the branding of Ediswan valves ceased in the same year. Also a BBC stamp would have been used after November 1922.
4 volt directly heated cathode (bright emitter); filament 4 volts at 750 ma; anode 30 to 80 volts.
Physical Description
Tubular glass bulb with top exhaust tip with 4 pin European style base with nickel plated base shell.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Unknown Acquisition Method from Unknown Source
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Manufacturer
The Edison Swan Electric Co. Ltd., Charing Cross Road, London, England, Great Britain, 1922
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Inscriptions
Bulb: ROYAL/EDISWAN/MADE IN/ENGLAND/AR625
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Brand Names
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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
107 mm (Length), 31 mm (Outside Diameter)
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References
Stokes: PP 190-191
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 1982, 190-191 Pages
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Keywords