Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
This circuit was taken from an article in Electronics Now magazine in February 1995. The power...
This circuit was found in a 70s American documentation. The converter can be of any type and the...
This circuit was found in a 1976 documentation. It can be used with old tape recording mechanisms for...