Summary
Triode, designed for telephone repeaters, used as a Class A power output amplifier. Manufactured by Western Electric (USA). This type was made from1921 until 1930, replacement tubes were still being made in the '40s. This valve was probably made between 1925 and 1929. 4.2 Volt,1.0 amp directly heated cathode.
Physical Description
Spherical bulb with top tip and 4 pin American 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/101-D/PAT. USA/(dates from1916 up to 1920)
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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
105 mm (Length), 60 mm (Outside Diameter)
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References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 280 - 285 Pages
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Keywords