kdj771

Hey so i got this vintage (im assuming) marshall mark II super lead 100w from a buddy to do some recording with. Today we tried it for the first time. We had it working and we were using the top left input on the front panel. My buddy told me we could bridge the lower left and upper right inputs together for a tonal difference. We did so and as soon as we did the amp immediately shut off. Wont turn back on now. Pulled the fuses but they dont look like their blown, but im not ruling it out. What could've happened here? Really hoping to get this sorted out since its not my amp and it IS a vintage marshall.