This LM380-based circuit was found in documentation from the 1980s. The components are current, and the transistor may be a general-purpose equivalent. Note the use of a medium impedance speaker.
We found this simple shortwave receiver in an Electronics Now from the 1990s. Details of the coil...
We found this circuit in a 90's European schematic. The circuit can be implemented with almost any...
In figure 1 we have an application for NLAS5113, a new device from on Semiconductor...