Found in the 1975 RCA tube manual, this circuit appears elsewhere in this section. The circuit uses contemporary components and is powered by the power grid.
The operational amplifier taken as an example is uncommon today, but the configuration can be made...
The integrated circuit used in this regulator is not easy to obtain, since the publication is from...
This configuration was obtained in a 1977 FET Databook. The circuit can be practically any JFET...