Summary
Troide, introduced in circa1921, similar to 101D tube. It probably was used in telephone repeater equipment.
The manufacturer might be Western Electric, USA or even Standard Telephones & Cables, in Australia or England.
Physical Description
Spherical bulb mounted on 4-pin base. Filaments are double v inverted, with grid either side of filament. Anode is twin flat plate..
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Wireless Institute of Australia, Mr Max Howden, 28 Apr 1967
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Manufacturer (Possible)
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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
115 mm (Length), 60 mm (Outside Diameter)
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References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 279 - 284 Pages
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Keywords