I have a 75 Bassman 10 that came in blowing fuses. The fuse that came out of the amp was a 10 amp. Best I can tell, it had a short occur either in a tube or in the circuit and it wiped out the original PT. I installed a used replacement 606- tranny and put in a 3amp slow blow. I put it on the variac and brought it up slow. I was getting bias, high and heater voltage. Once it hit around 60 volts on the variac, the fuse blew again. I found 3 bad diodes in the SS rectifier and replaced them. Blew again at around the same ac voltage. All electrolytics are original but all tested at pretty much on the money with what value they were supposed to be. I swapped out the bias cap because it was way out of range. Same issue. The fuse will blow with no tubes and with only the mains on. It doesn’t seem to change when standby is off either. Any suggestions? Could it be the mains filter caps even tho they tested in spec? Thanks for the help.