Summary
General purpose triode with a 1 volt filament that consumes 250 mA.
The original design of this valve dates back to the First World War and it was manufactured with various improvements through the 1920s and 1930s. During 1923-24 it was made in England by Mullard and labelled 215A 'Wecovalve', It was also sold there by British Western Electric as the 4215A.
In 1925 British Western Electric became Standard Telephones and Cables Ltd. (STC). They marketed their valves at that time under the name 'Standard'. This valve was renamed G125A and was also supplied with a conventional European 4 pin base as a G215. The dual marking of this example indicates that it must have been made at around the time of the name change.
This valve was the same as the Western Electric 215A and the British Western Electric 4215A. It still has the 4215A marking on the bulb.
Manufacturer: Standard Telephones and Cables, England.
Physical Description
Small tubular bulb with exhaust tip on top with base with 4 contacts ('nubs' or soldered bumps).
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
Standard Telephone & Cables Ltd (STC Ltd), England, Great Britain, 1925
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Inscriptions
Bulb: Standard/G125A/No.4215A/Patd in GT.Brit./17580-15/80090
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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
66 mm (Length), 15 mm (Outside Diameter)
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References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 292 - 296 Pages
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 203 - 205 Pages
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