Featured in the February 1949 Radio Electronics magazine, this benchtop instrument generates multi-range audio signals. The circuit has 6 tubes including the rectifier.
The circuit presented is a simple MW tuner that can be plugged into the input of any audio...
This circuit is from an American 1967 documentation and can be implemented with modern equivalent...
This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on...