The operational amplifier used in this application is uncommon today. This Raytheon circuit can be designed with equivalent operational and the power supply must be symmetrical.
Found in an English documentation, this circuit provides a 50 Hz signal according to the local...
This circuit provides 15W per channel and can operate with a single power supply. The circuit is...
This preamplifier for the 6 or 2-meter range was obtained from an American documentation from the...