Alright... Easy there. First off... @timewaster1700 If I was critisizing I really wasn't referring about you. Second, i believe that the forums, youtube, etc... Is quite a good place to start scratching the surface of this fascinating field. But I am also 100% possitive that if you keep studiing and deepening your knowledge about electronics you will soon find that all what you've read, etc until now is really just that: scratching the surface, and thats completely fine cause everyone need to start by the beginning right? No one can start by being an expert. What I was trying to address is the false advice that people gave you about the supposed "fact" that it is all the same with the different components as long as the "specs and stuff" are the right ones. Specs meaning here the basic specs like resistance, capacitance, max current handling, input voltage, output voltage, etc etc As I said you can build pretty good sounding amplifiers with "surface scratched knowledge". But that's just that, the surface. Once you start getting deeper, you will see that electronics start becoming something quite more complicated than those mere "specs" and that there is a whole load of variables and aspects that come into play as well, but for that you need to dig in (I am thinking in transformers or tubes here for example, or even caps) Now, regarding @JuneauMike comment, i believe that those old amplifiers that sat the standard for good sound were really not THAT special, i think though that Leo, specially Leo, took a lot of care finetuning their sound, hearing and tweaking until he would find the desired tone, and that he had a heck of a good taste and some friends that were some truly excellent guitar players that knew how an electric guitar should sound. The difference is that at that time the best and most brilliant minds in the world were very busy developing components and they were also really excited about what they were doing, hence they built really good stuff, quality stuff.