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.
This circuit was obtained from an English magazine from 1981. The magazine no longer exists, but...
This low distortion circuit was found in a 1964 Electronic Design. The transistor admits...
This instrumentation circuit was found in the September 1989 issue of Radio Electronics magazine....