This amplifier with the EL84 tube is a European commercial type from Corpim mounted on a printed circuit board. The diagram appeared in a September 1958 Radio Electronics magazine.
This moisture-activated relay was obtained from an American documentation from the 1980s,...
Found in an old American publication, this circuit indicates the direction the antenna is pointing in...
We found this circuit in Radio Electronics magazine from August 1984. The circuit aims to control the...