Summary
6.3 V indirectly heated cathode, manufactured by Hygrade Sylvania Corporation, Emporium, PA, USA, 1941-1950.
The 7R7 is a double diode remote cut-off pentode designed for use in airborne and other receivers subject to shock and vibration.
The Loctal base fitted to this valve has a detent on the locating spigot which prevents the valve from coming out of its socket when subjected to vibration such as that encountered in aircraft equipment.
Physical Description
Tubular glass bulb on loctal base.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Unknown Acquisition Method from Unknown Source, 1981
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Manufacturer
Hygrade - Sylvania Corporation., Emporium, Pennsylvania, United States of America, 1941-1950
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Inscriptions
Top of bulb: 7R7 Side of bulb: (Sylvania logo)/SY(illegible)/MADE(illegible) Paper label on bulb: 7R7
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Brand Names
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Classification
Electronics, Vacuum technology, Amplification & rectification
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Category
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Discipline
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Type of item
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Overall Dimensions
69 mm (Length), 30 mm (Outside Diameter)
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Keywords