Summary
Triode with two grids and one plate designed for detection. Manufacturer: The Ken-Rad Corporation, Owensboro, Kentucky, USA.
Referred to as Wunderlich tubes but possibly independently developed by Ken-Rad. These tubes were only used by a very small number of manufacturers for a couple of years.
2.5 V directly heated cathode.
Physical Description
Conical bulb on six pin American 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
The Ken-Rad Corporation, Owensboro, Kentucky, United States of America, circa 1932
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Inscriptions
Bulb: KR20 Base: Ken-Rad/Made in USA
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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
102 mm (Length), 38 mm (Outside Diameter)
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References
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 83 - 85 Pages
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Keywords