Has anyone solved pickup hum on a Kramer 450B or any other Kramers with humbucker pickups? When I point the neck in the same direction that the amp and cabs are facing, all is quiet even with the gain elevated but when I rotate the guitar 90 degrees, too much hum. It's similar to a feedback. Has anyone had success shielding with copper or aluminum tape? My 450B has an aluminum base plate in the cavity already but that's it for shielding. The farther I play from the system, the hum decreases. Basically, the more gain the more hum. It doesn't seem to be a ground loop problem. Thanks for any effort to respond. From bcbrian in British Columbia Canada.