MSD let the smoke out of the box...

First time in 8 years ive ever had a problem with MSD, and it sure was a doozie...Im thinking it was a faulty resistor that decided to bite the dust and take out everything around it. it was an analog 6A. Just what i needed at 4:30 in the morning. I rechecked all the wiring, ground was zero ohms resistance from battery to block, to box, and from box to battery. (i have the ground for my box on the block, i know thats a no-no but its solid.) power supply is 0.1 volts lower than battery voltage, signal wire is the same. so im confident its just a case of horrible luck and timing....anyone else out there have a meltdown like this?