I'd like to plug the YouTube Video by Jim Lill - "Tested: Where Does The Tone Come From In A Guitar Amplifier?"

https://www.youtube.com/watch?v=wcBEOcPtlYk

I will second your recommendation and also recommend all of his ‘Tested’ videos. The microphone ‘Tested’ video was also an absolute delight.

The delivery style gets to some people (i.e. “I’m not ___ I just play guitar…”) but i find it absolutely fine.

I moved on from tube amps about 15 years ago and now really enjoy a variety of different solid state amplification stages with varying EQ and ‘dirt’ options at various places. Turns out a lot like were Jim’s Video goes.