Summary
Two HeptodeType 2A7 Electronic Valves, circa 1934; one manufactured by Hygrade and the other by Ken-Rad. The heptode or pentagrid converter combined the functions of local oscillator and mixer in the one valve. The 6A7 is same valve with a 6.3 volt heater. 2.5 volt indirectly heated cathode.
Physical Description
Intact valve: shouldered glass bulb with top cap and American small 7 pin base. Mounted on display block with a sectioned example of the same type of valve. Sectioned valve: sectioned shouldered glass bulb with top cap and American small 7 pin base. Mounted on display block with a complete example of the same type of valve
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from C. G. McGlinn, 19 Jan 1949
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Manufacturer
Hygrade, United States of America, circa 1934
Manufacturer of intact valve. -
Manufacturer
The Ken-Rad Corporation, United States of America, circa 1934
Manufacturer of sectioned valve -
Inscriptions
Intact valve: Base: Hygrade Sectioned valve: Sectioned shouldered glass bulb with top cap and American small 7 pin base. Mounted on display block with a complete example of the same type of valve. Base: Ken-Rad/D K 1 Display block: Brief Description.
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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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Part Dimensions
116 mm (Length), 38 mm (Outside Diameter)
Overall Dimensions of intact valve, excluding display block.
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Part Dimensions
114 mm (Length), 38 mm (Outside Diameter)
Overall Dimensions of sectioned valve, excluding display block.
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Keywords
