I dug up this one from my old tech school experiments book. The impedance at the emitter of the transistor is around 26
hm: and the voltage gain from emitter to collector was calculated to be 286 and measured at 257. This amplifier is only good for amplifying a signal from a low impedance source such as a speaker used as a microphone etc.... The 1K resistor on the input is just used so the amplifier isn't over driven if you source it with a signal generator for testing. You would eliminate the 1K if the input source was a
speaker-as-mic as noted above.