Summary
High vacuum (hard) triode. Designed for use in wireless equipment used by the British Navy during World War 1.
Originally developed by British Thomson-Houston (BTH) but later manufactured by Osram.
Manufacturer: Osram Lamp Works, England.
Introduced in 1916 to replace the Audion and a soft valve in use, an important valve because it represents one of the first attempts to standardize performance.
Physical Description
Conical bulb mounted on wooden display block via a screw cap attached over the exhaust tip. The 'pinch' is at the top with the filament lead-out wires brought around the outside of the bulb to connect to the screw base.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from J. Kelleher, 29 Mar 1948
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Manufacturer
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Inscriptions
Bulb: Osram/GEC/Made in England/R.4/Valve wireless receiving/No. R.4/Patt No 4411/No.A.4503 Dispaly block: (valve details)
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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
82 mm (Height), 51 mm (Outside Diameter)
Dimensions of valve, excluding display block.
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References
[Book] Stewart, Finlayson (Fin). 1998. History of GEC and the Marconi Osram Valve., 1998, 40, 44, 77 Pages
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 219-220 Pages
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