RCL Model 10303 (?) GM Tubes (mid 1950s) |
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These two beta-gamma GM tubes were manufactured by Radiation Counter Laboratories of Skokie Illinois. Unfortunately, I have no hard information about them. They appear to be very similar to what became the RCL Model 10303. The latter, like these tubes, was painted black, had a three pronged base, employed a silver cathode, and was approximately 4 3/4" long and 5/8" in diameter. The numbers that appear on the base underneath the letters RCL, 7-55 and 7-56, almost certainly refer to the dates of production
Size: 7-55 4 3/4" long, 5/8" diameter Wall: glass, estimated thickness 30 mg/cm2 Cathode: Inner surface of glass wall coated with silver Operating voltage: estimated 900 volts
Reference Radiation Counter Laboratories catalog, Radiation Detectors, no date. Estimated late 50s
Donated by Ron Kathren |
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