@emergingsoul Someone mentioned using CHTgpt, so I decided to access it and a pretty good and simple explanation comes out.
Here is what it says:
Today
An electronic tube, like the KT-88, amplifies a signal by using a process called electron flow control. Here's a simple explanation of how it works:
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Cathode Emission: Inside the tube, there's a cathode, which is heated. When the cathode gets hot, it emits electrons into the surrounding space. This emission of electrons is called thermionic emission.
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Controlled Electron Flow: These emitted electrons are negatively charged, and they naturally want to move towards a positively charged electrode called the anode (or plate). However, there's another electrode called the grid placed between the cathode and the anode. The grid can be negatively or positively charged, and it controls the flow of electrons.
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Amplification: When a small input signal is applied to the grid, it either attracts or repels the emitted electrons. If the grid is negatively charged, it repels some of the electrons, reducing the flow from the cathode to the anode. Conversely, if it's positively charged, it attracts more electrons, increasing the flow. This control of electron flow at the grid allows the tube to amplify the input signal.
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Output Signal: As the electron flow from the cathode to the anode is controlled by the grid, the varying input signal gets "amplified." This amplified signal appears at the anode as an output signal, but it's now a larger version of the original input signal.
In summary, an electronic tube like the KT-88 amplifies a signal by using controlled electron flow. The input signal applied to the grid modulates the flow of electrons between the cathode and anode, resulting in an amplified output signal that reproduces the input signal but at a higher level of strength. This process is used in vacuum tube amplifiers to boost the power of audio signals for applications like music amplification.