Consider this simple common emitter amplifier (I modeled it in PartSim ... but they do affect the overall design. The first is the Vbe drop. For a normal silicon transistor, this should be ...

Figure 2 This amplifier circuit produces the distorted waveform in Figure 3. Diode D 1 compensates for the distortion inherent in the npn transistor. The voltage gain of a common-emitter amplifier ...

[Paulo]’s calculator will therefore compute most of the characteristics of two class A common emitter/collector amplifiers for specified loads.