I did not decide on the laws of physics: to saturate a triode well, these conditions must be met and that's it. In your amplifier the valves are powered by 200 to 300 VDC and even much more for the power tubes. So it's not with the pretty little pedals that work with a small battery of only 9V that you are going to shake them properly, let's be serious.
On most read valve amps (mettre une liste en lien), your guitar enters almost directly on a first triode, then follows the volume potentiometer or a sort of tone control or both (or the gain potentiometer if your amp has a master volume, but this is the another way).
Of course, the signal chain continues perhaps to a tone stack and to the power valves : it's up to you to adjust the sound to you taste but keep always in mind that you have to prevent too much bass that strain the valves at each stage.
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