Summary
Indirectly heated version of the type 80 rectifier; used as rectifier in radio receivers. 5 V indirectly heated cathode, manufactured by STC, Receiving Valve Division, England.
By using an indirectly heated cathode it was possible to reduce the cathode plate spacing relative to the directly heated type 80 rectifier resulting in a substantially lower voltage drop. A further advantage of the indirectly heated cathode was that the warm-up time of the rectifier matched that of the other valves in the equipment, preventing the occurrence of a voltage peak prior to the full load coming on to the power supply. Equivalent to the octal based 5Z4G and similar to the higher rated 83V.
Physical Description
Shouldered glass bulb with four pin UX style 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
Receiving Valve Division, STC, England, Great Britain, circa 1937
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Inscriptions
Paper label on base: 803 Base: BRIMAR/MADE IN ENGLAND Bulb: (handwritten)80 3
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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
120 mm (Length), 45 mm (Outside Diameter)
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Keywords