Summary
Large audio power output triode, used as modulator and amplifier in radiotelephone transmitters. Developed by Westinghouse.
Manufacturer: Probably Hygrade Lamp Co. Salem Massachusetts, USA. But may have been made after their merger in 1931 with Sylvania, in which case the manufacturer would have been the Hygrade-Sylvania Corp.
Equivalent to RCA UX-250, it has an oxide coated filament which took 1.25 A at 7.5 V. Anode voltage was 450 with 4.7 watts output.
7.5 V directly heated cathode.
Physical Description
Large conical bulb with 4 pin UX style base.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from I. E. Morton, 10 Mar 1972
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Manufacturer
Hygrade, United States of America, circa 1929
Manufacturer: Probably Hygrade Lamp Co. Salem Massachusetts, USA. But may have been made after their merger in 1931 with Sylvania, in which case the manufacturer would have been the Hygrade-Sylvania Corp. -
Inscriptions
Base: Hygrade/X-250
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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
149 mm (Length), 66 mm (Outside Diameter)
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References
Both References deal with Hygrade and Hygrade-Sylvania.
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 172 Pages
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 356 Pages
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