Summary
General purpose triode developed at the end of WW 1 (1914 - 1917).
5 volt directly heated cathode, manufactured by M. O. Valve Company, England, circa 1920.
Physical Description
Spherical globe with tip with nickel plated European style 4 pin base.Bulb has light gunmetal colour due to getter.
More Information
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Collection Names
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Collecting Areas
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Manufacturer
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Inscriptions
Bulb: Marconi Valve/Osram/Covered by various patents/Made in England/R/178 Paper sticker on base: Fil Volts 4.0/Fil Amps 0.65 av/anode volts 45-60
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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
112 mm (Length), 54 mm (Outside Diameter)
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References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 217 - 221 Pages
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Keywords