Raytheon Model CK 1020 and 1021 GM Tubes (ca. early 1950s)
|The Models CK 1020 and 1021 are nearly identical thin wall beta-gamma GM tubes manufactured by Raytheon Manufacturing Company of Newton Massachusetts. The only difference between the two is size: the 1020 is 3/4" longer than the 1021. In the photo, the tubes on the left and in the center are Model 1020s. The tube on the right is a 1021. Because the tubes are light sensitive, they are painted black. For fun, I removed the paint from the top end of the tube in the center of the photograph. As such, the end of the cathode, a thin coating of aquadag on the inside of the glass, is visible.|
Size: CK 1020 6" long, 3/4" diameter
CK 1021 5 1/4" long, 21/32" diameter
Wall: glass, 35 mg/cm2
Cathode: Inner surface of glass wall coated with aquadag (3" for 1020 and 2.5" for 1021)
Operating voltage: 850 - 950 volts
Gas: organic quenched
AEC Radiation Instrument
Catalog, page date
Nucleonics May 1949, page 96.
Nucleonics April 1954, back cover.
Raytheon technical specifications sheet.
Donated by Ron Kathren
Last updated: 07/25/07
Copyright 1999, Oak Ridge Associated Universities