We’re guessing that some of our readers already are familiar with these class A amplifiers, commonly used to amplify small audio signals. Skipping over the fact that their efficiency is quite ...

[Ynze] has built an audio amplifier that looks ... interesting things about [Ynze’s] amp, as well as many of the Gainclones, is the fact that they use no circuit board. All wiring is done ...

they can be represented as part of small signal model as shown below Noise Analysis of Common Source Amplifier with resistive load: The small signal equivalent of above circuit including noise sources ...