Taking pickups, speakers, and pedals out of the equation, I hear most of an amp's tone comes from the circuit, and then the tubes. Just want to know how much more the circuit is a part of the amp's voice; 60%? 90%? Scenario: got a Vox style amp with EL34s in the output section, want to see what it'll sound like if I replace em with fendery 6L6 (re-biased ofcourse) in it. Fendery-vox sounds good in my head, but does anyone know? CLIPS ARE KING if you have em!