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 transistor tester was found in a 1980 publication. The transistor can be the BC548 and the...
It can be obtained from Mouser Electronics the new 1,500 W RF high power transistor MRF1K50H fro m...
We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR...