Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz. Modern equivalent transistors can be used.
USB58xx and USB59xx Devices Integrate a 2:1 Multiplexer to Support Reversible Connection of USB...
This circuit was obtained from an ancient American documentation. The coil consists of 80 to 100...
In the figure we show how to implement a voltage reference with the ON Semiconductor rail-to-rail...