So if you have followed everything so far, we have three separate grounds; the signal return, the power supply return, and the chassis. I find that all must interconnect at a single place to avoid having any conductor contaminated with something from one of the others. I suppose that putting signal on a power conductor would not be likely to cause the power supply any problems, but the reverse results in serious issues.
Class A Amplifier operation is where the entire input signal waveform is faithfully reproduced at the amplifiers output as the transistor is perfectly biased within its active region, thereby never reaching either of its Cut-off or Saturation regions. This then results in the AC input signal being perfectly “centred” between the amplifiers upper and lower signal limits as shown below.
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