insanely extreme high gain amplifier?

I am thinking of using 5 or 6 transistors and making an insanely high gain amplifier (not intended for audio use)
for extreme sensitivity

If it works. would it be possible to put an extremely high ohms resistor to bias it (would a million ohms or 500 thousand ohms or 50,000 ohms be enough?) to get a low but clean audio signal out of the amplifier? (only for testing purposes)
using only a low voltage power source... like 9 volts or less.
the absurdly high gain is for testing purposes with my own experiments..