We found this circuit in an old American documentation, but the circuit can still be assembled with ease as the used components are still available. MOSFETs admit equivalents.
We found this circuit in an article of our own from 1992. The circuit is based on an integrated circuit...
This preamp version uses BC109 transistors that are older versions of the current BC549 in plastic...
The transistors of this circuit may be the BC548 or BC549 and its power supply can be performed...