I have an old SB-1 that was kind of buzzy at the last gig I brought it to. I figured it was just the lights and the fact that these basses tend not to be all that well shielded. However, when I opened it up just to be sure, the ground wire appears to run from the bridge to the output jack. I'm not so great at reading schematics, but on most diagrams I've seen it appears the ground should run from the bridge to the tone pot. Did someone wire this incorrectly? Is there a big difference over grounding to the jack rather than the tone pot? Everything else works fine otherwise, and ground hum does not appear to be an issue except for this one instance on stage. Is this just a shielding issue, or should I rewire the ground on this thing?