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 circuit presented consists precisely of an oscillator (multivibrator) that takes advantage of the 4...
The critical components of this project from a 1978 publication are the transformers, which can be...
This circuit can switch signals in the 3.5 to 30 MHz band. We found it in a QST magazine from the...