Chuck wrote: When I removed crystals X1 and X2, I had to remove the ground jumpers from the crystals. The instructions don't have me ground the can of the new X1. Should the new X1 be grounded? Chuck, I have done an upgrade, but I can tell you that the shells of all the crystals in my K2 are grounded. If you are going to put in the DSP, ground it on the side, not on the top. 73 Jim, W4ATK K2 #4028