Hello , i just got my hands on a Dallas 50 1x12 combo. I am trying to figure out the order of the preamps , meaning where to put the 12AX7 vs 12AT7 . The location of where to put the preamps is not inside of the amp. Also the amp came with 3 12AXs and 1 12AT7 . Any help would be greatly appreciated and if you have any tips i would love to hear them . Thank you guys !