This is the traditional audio preamp configuration with the National Semiconductor LM382. The circuit has good gain and can be used with magnetic pickups or from signals from an auxiliary input.
Other operational amplifiers of the same the series, such as the MC34072, MC34074, MC35071,...
This circuit is from documentation from 1965. However, it can be created with modern transistors. Power...
This two-transistor delay circuit from the 1960s was found in documentation from the time....