We found this configuration in a 70s American documentation. The circuit makes use of operational amplifiers of the time. Modern equivalents can be tested.
This power supply is indicated to power small loads up to 30 mA. The original output voltage is 6...
Synchronized key. This circuit was found in a 1966 General Electric documentation. Modern...
This setting appears multiple times on the site from different sources. This is from a 2000 manual...