Summary
Triode, known as the 'half-ampere L tube', used in telephone repeaters. Manufactured by Western Electric (USA). Introduced in 1927. The 101 or 'L Tube' family were produced for a very long time. The ST bulb on this one suggests that it was made in the late 1930s or 1940s.
0.5 amp directly heated cathode. 4 Volt filament drawing 0.5 amp (hence its name).
Physical Description
Shouldered glass bulb, 4 pin bakelite UV style base.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Mrs F. Jeffery, 07 Jun 1976
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Manufacturer
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Inscriptions
Bulb: WESTERN ELECTRIC/MADE IN USA/101F/ Stamped on bulb: GOVT.
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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
117 mm (Length), 44 mm (Outside Diameter)
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References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 283 - 285 Pages
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Keywords