This plug-in control was found in General Electric documentation from the 1970s. The SCR can be the TIC106 mounted on a heatsink. The circuit can be changed to the 220 V network.
We found this circuit in a 1977 documentation. The National Semiconductor's LM380 is no longer...
The component used in this circuit that we found in an old documentation, is not easy to obtain...
We found this circuit in an old General Electric documentation. In fact, PUTs are not common...