Most people can provide evidence that it's round. Sheesh, simple pictures
from outer space even. People didn't just start believing that it was round
because one person said it was. That's your problem. Someone told you why
one amp is better than the other and you believed it without any evidence.
Don't be embarassed. It's quite common for people who don't have any
experience building/designing/repairing amplifiers.

Its not that hard to see for yourself that the earth is round. All you have to
do is go swimming in a large lake and look at the shore from various distances
and see what happens........