well guys the 2nd mallory heli electronic

I've run Mallory ignitions since '84 without a single failure. I've known two people personaly whos MSD boxes have failed at the worst possible time, one while bracket bracket racing and another in a SCCA race.

There's a lot things that can cause an ignition to fail, like failing to dissconect the box and distributor before welding. When you say the "carbon tip broke off", was it the carbon contact on the cap?