This thread talks about Cmos pulse generators and oscillators, not BJT transistors. You should have started your own thread.
The voltage gain of a common-emitter transistor that doesn't have feedback from its collector to its base is simply the collector resistor (and anything in parallel with it) divided by the unbypassed emitter resistance.
Of course the input of the transistor must have a properly calculated DC bias voltage.
So a transistor wirh a 12k collector resistor, a 62k load and a 1k emitter resistor has a voltage gain of 10.
If the emitter resistor is bypassed then the voltage gain is about 180 with high distortion at high levels.