I will say this and you are right no measurement of numbers will tell your ears what they are calibrating coming out of speakers in your own listening room..
I started with the Raven Audio Black Hawk for 45 day trial and what I heard changed me for ever with never owning tubes ..You can go to Audio store and listen and yes get basic concept but until it is in front of you that is the tell tale sign of tubes or solid state for you..And then this is just the start of your tube voyage..the good cables to gain little more sound detail and tube rolling will change everything you thought you heard ..You start buying Military tubes that will cost but the reward is worth it..No matter who you are you are always striving to hear a little more over few years after you get used to what you have...Its been a 5 year journey for me and I at 73 yrs old are at my max sound system ..