Summary
Inert gas cold cathode rectifier developed by Charles Grover Smith for the American Radio and Research Corporation (Amrad) in the early 1920s. It went into production in 1922 but it was only suitable for high voltage applications such as transmitters.
Manufacturer: American Radio and Research Corporation, Medford Hillside, Massachusetts, USA.
Tube uses a cylindrical iron anode and a carbon cup cathode.
Physical Description
Conical globe bulb with Edison screw base and exhaust tip on top.
More Information
-
Collection Names
-
Collecting Areas
-
Acquisition Information
Donation from S. W. Gadsen, 25 Jun 1927
-
Manufacturer
American Radio and Research Corporation, Medford Hillside, Massachusetts, United States of America, 1920s
-
Inscriptions
Nothing on bulb or base. Inside bulb and written in pencil: 807-R
-
Classification
-
Category
-
Discipline
-
Type of item
-
Overall Dimensions
126 mm (Length), 64 mm (Outside Diameter)
-
Overall Dimensions
125 mm (Length), 54 mm (Outside Diameter)
-
References
For a description of the tube and the principle of operation see Morecroft: "Electron Tubes" p. 148. Further data on file card.
[Book] Douglas, A. Radio Manufacturers of the 1920s. Vol. 1., 53 Pages
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 112 Pages
-
Keywords