Study A Class Amplifier Schematic
base voltage is about 3 volts

emitter voltage about 2 volts

emitter current = 2v/150 or 12mA

The reac thus is 2 ohms (transconductance is 0.48 amps/volt)

the gain of the transistor is 1.8K / 2 ohms or about 900x

this circuit also has huge input capacity caused by Miller multiplication of Cob * gain of the 2n3904; this will be about 10,000 picofarads

but this circuit also has global negative feedback, implemented right at the input