Dan, right after the Sierra coils changed from Prufex [German made] to Chinese origin, I did a comparative test of both of them on my Stevens machine. Both coils ohm out practically the same. Believe it or not, the Chinese coils would fire with a nice blue spark, with lower amps at the primary than the German coil… i don’t recall how much lower the Stevens meter showed, but it was significant. I was surprised. So electrically speaking, they work great. How long they will last is another question. Of course the laminates are poorly made, as we all know. I have a couple sets of them in service right now, so we will see. The other thing I hate about these is the method in which the coil is secured to the laminates… you can practically push the coil off with your fingers.
