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ID = 60423
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  SEMICONDUCTOR, general 
Identical to CK2129

Base Wires only.

Four-terminal optoelectronic coupler, forerunner of optocouplers, containing one neon lamp and one photoresistor in a cylindrical case. Also known as Raysistor it was used in a variety of control circuits.
Control lamp: 120V ac or dc at 0.5 to 3.5 mA
Photoresistor: 2000 ohms on, 10 megaohms, 200 V max, 250 mW
Switching time: 10ms on, 350ms off.

Information source - - Manufacturers Literature   

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