This version removes the direct coupling of Q2 in the previous version and increases the emitter resistor as well, finally the regeneration control is moved to the emitter circuit. The result is little better performance with less loading of the tank and less detuning caused by regeneration adjustment. Probably other optimizations possible also. I tried to make this thing not work…and it was difficult requiring extreme deviation from shown component values. It should be very easy to get this thing up and running with all sorts of tank circuits. It works well with a broad range of supply voltages also the values for R7, R8, R9, and R10 have a wide range of functional values. So one probably wants to start with my values and then tweak for best performance, once the circuit is up and running.
Schematic Diagram(modified TDA7052at circuit 07/01/2015)