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.
This converter converts signals from the 50 MHz band to the AM band, making it possible to receive...
This circuit, from a 1987 documentation, is for the CB3817E transmitter. Connected to the handset...
The output of this circuit can be a crystal phone or a piezoelectric capsule. The circuit tests the...