We found this tube receiver in a 1950s Japanese publication. The circuit uses 5 tubes and has an RF amplifier stage for greater sensitivity. The power supply is not shown on the circuit.
The transistors in this circuit accept equivalents and the coil is of the car ignition type. The...
This transistorized signal injector was one of the first that we found using the well-known...
Found in a 1990s American documentation, this circuit provides an output voltage approximately 4 times...