I’ve asked this question directly to humans and haven’t had good answers. I don’t think many people really do know. Google reference is not good on this point for some reason. YouTube doesnt offer an explanation of what happens inside a tube that I could find without getting odd vids scarily technical and not helpful.

And then there’s this amazing forum which offers incredibly smart people willing to offer their knowledge and be very helpful.

So this is my last hope

The book is free...

http://www.guitarstudio.tv/documents/Designing-V-T-Amplifiers.pdf

This one is free too...

http://www.introni.it/pdf/18%20-%20Vacuum%20Tube%20Amplifiers.pdf

This book is free too :

https://pearl-hifi.com/06_Lit_Archive/15_Mfrs_Publications/GEC_UK/GEC-UK_AF_Amplifier_Design.pdf

more basic and free book :

http://www.tubebooks.org/file_downloads/bereskin_buildit.pdf

Very good book here , begin here :

https://www.vtadiy.com/book/

Deeper book :

https://www.theseus.fi/bitstream/handle/10024/126712/Popovs_Sergejs.pdf?sequence=1&isAllowed=y

Another one :

http://www.lundahl.se/wp-content/uploads/datasheets/amplifier_30wpp.pdf

I will stop here...

And listen to this short youtube video :

Let's design an build a vacuum tube amplifier from scratch

https://www.youtube.com/watch?v=9AABLml-ERE

ChatGPT is your friend if you are having trouble getting along with Google

And no I can’t

@emergingsoul 

You are really comical. You started one thread declaring (as fact) that tubes were better than solid state, and now you admit that you don't even know how they work. @mahgister is right, read a book!

Common guys, give him a break. You do not have to know how a technology works to realize it does.