hello
don't forget another parameter wich has a big effect on the result:
internal impedance of the signal generator !
All reactance of capacitor must be as low as possible at the frequency test...
1µF at 1000Hz Xc module = 159 ohms...
Test with C2=470µF accross 60 ohms => gain is near 50 with Rg internal of generator=1 ohms
but Gain decrease to 16 if Rg=500 ohms
Test Without C2
True EC with RE mode !
Approximation gives G=RC/RE for low gain and big h21e parameter of transistor.
but RC is resistor in collector circuit , in parrallel with the following R load
ex: RC=250 ohms and load=1Kohms => result RCequiv=200 ohms
G= 200/60 => 3.3 theorique 3.05 simulator
R6 is ajusted to obtain near V+/2 on collector