Under 10uV input over 2V output. Over 100000 times gain. For this amp to work one will need a few very low noise transistors (bc550) a very nice shielding and grounding too. Since every stage acts as a demodulator the whole circuit is not only an amp but also a detector too. Just add an LC bandpass filter at the input to tune in to different stations. The inductor should be 60-80 turns on a 10cm ferrite rod so it could become an antenna for the whole circuit. So basically this is an AM radio rather than a simple amp. Come on herzy find the flaws or better yet rebuild the circuit :D
