Using SCRs, this circuit from a 1967 General Electric manual allows full wave load control with SCRs. SCRs can be modern types depending on the load.
This modern regenerative receiver was featured in the March 1994 issue of Electronics Now...
As part of a larger project, we found this modulation meter in the August 1994 Electronics Now...
This small receiver for the medium wave range was found in Radio Electronics magazine from July...