The purpose of this circuit is to silence the hiss that exists between the stations on an FM receiver. The circuit was found in American documentation from the 1980s.
This direct coupled circuit operates in class AB with good gain. The circuit is powered by 12 V....
This circuit was taken from the 1974 Ferranti transistor manual. Note the shapes of the signals....
This circuit is from a 1982 publication but can be assembled with BF245 for Q1 and BC548 for Q2....