fx loop

Hi, does anyone know that if i pass my signal through the fx loop (return) of mt 15, does the signal goes through 6L6 tubes before reaching cabinet. I intend to use this signal chain with my multi-fx floor board. Nothing goes through front input.

Hi all, I'm new to this forum because of the MT15 which I received just yesterday. First of all: unbelievably great sounds. I love the the cleans and also the high gain sounds. So much fuller and bigger than what I've heard over the last month's even at room-level. (Been through Mesa, Diezel...