This amplifier has a gain of 42.3dB (130V/V) for any signal no matter how small because the transistor is already biased and the signal doesn’t have to be large enough to bias the transistor on it’s own like in a class-C amplifier. The capacitor at the top is to limit the high-frequency response. This amplifier has some harmonic distortion, but that can be reduced by giving it a smaller signal so that the output doesn’t distort as much or by using a different design.
Edit: @hurz had brought up the point that because the upper frequency limiting capacitor fed directly to the base of the transistor, which directly connects to the input through a capacitor, it not only loaded down on the input but it was very sensitive to input resistance. To fix that, I repositioned the capacitor so that it did not connect to the input and was not affected by input resistance, but input resistance still reduces the gain.
Edit2: Since @hurz didn’t like how the 4.7nF capacitor connected to the emitter of the transistor so that the 4.7mF capacitor acts a a direct route to ground, I moved it so that it was between the collector of the transistor and actual ground.
