Summary
The 27 was introduced in late 1927 as the UY227. It remained in production until World War II. In the early 1930s the various prefixes were dropped and it became plain 27. At about the same time the globe style bulb was replaced by the smaller shouldered type.
It was designed to be used as an amplifier or as either a grid-leak or biased detector. It has a 2.5 volt indirectly heated cathode.
Manufacturer: Hygrade-Sylvania Corp. Emporium, PA, USA
Physical Description
Shouldered glass bulb on 5 pin American (UY) base
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Mr Richard H. Fowler M.Agr.Sc. - Institute of Applied Science of Victoria, 27 Oct 1971
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Manufacturer
Hygrade - Sylvania Corporation., Emporium, Pennsylvania, United States of America, circa 1935
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Inscriptions
Bulb: 27 Base: Hygrade/MADE IN U.S.A.
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Classification
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Type of item
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Overall Dimensions
104 mm (Length), 38 mm (Outside Diameter)
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