I played a J bass recently I was interested in with Bartolini PU's and NTBT preamp that had a bizarre issue. When I soloed the bridge PU only the D and G strings had any output. When I hit the E and A strings there was very little signal, almost as if you were holding a microphone 10 feet from your mouth. The Neck PU soloed was fine until until I blended the bridge in and the same thing happened again. I am not sure if this is just a wiring issue or if it needs a new pickup. Before I consider buying, I want to find out what I'm in for. Any thoughts? Anyone? Thanks.