The solid state CE amplifier with Cb Bypass capacitor for improving gain can be explained as a circuit
even if they have to bypass the visual concept.
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The electrical physics inside the transistor is a good question. It is sort of not really relevant in getting the needed
skills within the scope of the macro level of the CE amplifier or the role of Cb. in improving gain.

In my opinion, parts of your last contribution need some clarification:
* What is the capacitor Cb ? Where is it located?
* What do you mean with "improving gain"? Do you mean "larger" gain or gain with less distortion? I ask this because a large gain value is not always the "best" gain.

The Cb capacitor passes the AC to the ground rail improving the congestion, The capacitor ground pathway can route AC signal back to the base called negative feedback.

Please, can you explain the meaning of the last sentence ("...back to the base called negative feedback").
I think, the opposite is true - the emitter bypass capacitor prevents ac negative feedback.
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Finally, I would like to make a brief comment on the video presented:
I don't know of any video on the emitter circuit that is less helpful.
Keywords:
* No explanation of the task of the 4 resistors,
* No information on the resistor values,
* No mention of the necessity/selection of a DC operating point,
* No explanation of how the voltage amplification occurs,
* Arbitrary assumption of an input voltage (10mV) and an output voltage (400mV) without any explanation/calculation (the same also applies to input and output currents).

How can one recommend something like this?

 

@LvW

The analogy as mentioned by you (faucet) it not too bad.

An analogy can be helpful to one type of person and not helpful to another.
Not everyone wants to adopt the water faucet analogy.

If someone wants to look at the discovery of John Bardeen for concept the inventors figurative representation is relevant.
The Electrical Engineer's drawing shows "This is what John Bardeen made" anything else is dumbing down what he was saying.
The full document shows the team's work that supports the discovery.


They can decide for themselves if the electrical event should be replaced with a mechanical faucet.
I do agree that the discipline of math should be respected, I find it more enjoyable when there is good structure.

The internet does make it more difficult to define variables in a standard way.
I really miss sitting in math class and it was such a long time ago. Is it my fault that I was too busy
trying to contemplate the role of water faucets that my time could have been better spent with pencil
and paper?

 

@ sparky 1 -
There were some ambiguities in your post#20, which I have addressed in my response (post#21)
I would appreciate it if you would also respond to them.