20th Century Electronics GM Tube (late 1950s, 1960s) |
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This particular tube, a Model B12H, was manufactured by 20th Century Electronics of New Addington, England. They are now known as Centronic and are located in Croydon, a suburb of London. The original glass wall was broken - that seen in the photograph is simply a replacement. What is most unusual about this tube is the configuration of the cathode, a spiral wire supported on the outside by three wires. Operating Voltage: 370 volts Plateau length: 100 volts. Sensitivity: 5600 cpm/mR/hr Size: ca. 7 1/2" long, 3/4" diameter Wall: glass
Donated by Dave Allard I am grateful to Prof. Jean-Francois Loude who provided the technical information about this tube. |
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