Hi just got my dual rec (old 2 channell one) in the post but one of the rectifier tubes is smashed (ups suck) i read in the manual i can pull 2 power tubes and it will run at half power with 2 6l6's and one rectifier tube now iv read here http://www.petrucciforum.com/forums/archive/index.php?t-33573.html that this will change the output ohms 4 to 8 8 to 16 ect is this correct id did not mention this in the mesa manual. I realy want to play with my new toy but i dont want to fuck up my cab can anyone help me out here and put my mind to rest