Summary
High vacuum half wave rectifier. A pair of these valves was used in radios, amplifiers and small transmitters requiring more power than could be delivered by the type 80 full-wave rectifier. Later renamed as type 81. 7.5 volt directly heated cathode
Manufacturer: Hygrade Lamp Co., Salem, MA, USA
Physical Description
Base type: American style UX No. of pins in base: 4 Bulb shape: conical Bulb material: glass
More Information
-
Collection Names
-
Collecting Areas
-
Acquisition Information
Unknown Acquisition Method from Unknown Source, 17 Sep 1978
-
Manufacturer
Hygrade Lamp Co., Salem, Massachusetts, United States of America, circa 1931
-
Inscriptions
Paper label on bulb: (remains of a Hygrade logo) Base: Hygrade / X-281
-
Brand Names
-
Classification
-
Category
-
Discipline
-
Type of item
-
Overall Dimensions
148 mm (Length), 60 mm (Outside Diameter)
-
Keywords