I am not sure about the rest of the people here, but we have moved everything over to AC yokes. Rarely have we ever found anything with our prods systems that could not be found with an AC yoke. We do ultrasonic inspection on our weldments, and the MT we do is really only looking for surface defects (cracking). Since there is obviously some people still using the prods method, I am curious what other shops are using. I unfondly remember perfecting the "flashlight in the mouth" method using the prods as well!!