Про взаимовлияние компонентов звука написано популярно:
"A pentode or beam tetrode circuit with a grid stopper, screen resistor, screen cap and bypassed cathode resistor has a very complex distortion interaction function that can lead to tube overdrive nirvana.
All of these components interact with one another during overdrive so tuning all of them to find an overdrive tone and playability sweet spot can be difficult and time consuming."