I have WWII ARC-5 transmitters and receivers for 160, 80, and 40 Meters, and I wanted to make them "Band switchable" so I built this controller.
I switch bands by turning on and off the filaments to the three sets of units.
PA B+ is applied to all trnasmitters, Receive/Tx Osc B+ is switched, and Tx Screens are grounded during Rx. The units without any heater supply draw virtually no current.
The receive auido is switched and buffered, but the RF gain controls are all in parallel.
There were a ton of wires and cable assemblies involved in this project
The block diagram of the controller.
The barrier strip assignments.