This physical line servo control uses components that are not currently common. The circuit is from an 80's documentation and is powered by a voltage according to the servo.
This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time...
This circuit was published in the Radio Electronics magazine of September 1950. The transistors are from...
) This circuit is from an old RCA linear integrated circuit manual from 1972, but it can be...