|LM386 as a medium wave regen receiver by user Selenium on RadioBoards Forum|
Interestingly, both the + and - inputs are tied together (pins 2 and 3). It is also quite unusual to connect pin 7 to anything but capacitors (for bypass or extra input as I have done), so that may change the bias of the input stage. Further, the smaller the impedance from pin 1 to ground, the larger the gain (here 10 uF in series with 1k for low frequencies and 100 pF for high frequencies).
If you want to read more about the regen circuit, go to the RadioBoards Forum here.