This typical circuit from the 1940's was found in a Radio Craft from 1947. There are 6 tubes for medium wave reception using a loop antenna. The circuit uses a transformerless source with the tube heaters connected in series.

This typical circuit from the 1940's was found in a Radio Craft from 1947. There are 6 tubes for medium wave reception using a loop antenna. The circuit uses a transformerless source with the tube heaters connected in series.