This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
This interesting circuit, found in a 1984 documentation, captures stations in the FM band and...
This circuit is from a 1967 General Electric SCR manual. The circuit supports other SCRs depending...
This simple low current source for the bench was found in ancient American documentation. The...