Alright- I'll bite- The reason tube preamps are often preferred over transistors is that they loose less of the signal. Transistors are pretty good at loosing low level detail so if you have transistor preamp driving a tube amp you will be missing a lot more of the signal: once the detail is lost you can't make it up downstream.
A better illustration of this principle is using a cheap microphone with an excellent recorder or a really fabulous mic with a cheap machine. The latter will turn out a better recording every time: you can't make up for lost detail downstream.
A better illustration of this principle is using a cheap microphone with an excellent recorder or a really fabulous mic with a cheap machine. The latter will turn out a better recording every time: you can't make up for lost detail downstream.