We found this circuit in 1967 General Electric documentation. SCRs can be replaced by current equivalents. The circuit is for 110V power grid.
In the figure we have an application of ON Semiconductor's own semiconductor manual from the 80's....
This circuit is from an 80's documentation, firing when the input voltage exceeds 5 V. The SCR can...
This preamplifier circuit for turntable cartridges was found in the March 1994 issue of...