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Bad humming is a sign he's not singing loud enough.
But seriously...round up the usual suspects. There's a grounding problem. If it goes away when he touches the strings, then your bridge may not be grounded well (or at all). Start at the HB and work your way toward the jack. Check all solder points. Then check 'em again, especially where all grounding terminates on the back of the vol pot (that is how you wired it, yes?). Put a multimeter on 'em. Then check 'em one more time. Send us a schematic of your wiring, and a semi-blurred photo of same inside the box. We will all take potshots at it, and nearly none of us will be absolutely right, because you will discover the answer yourself, slap your forehead, and say, "Doh!" Then this thread will be added to the Grounding Problems Lexicon. It's inevitable.
Then, get some of that shielding tape and shield the inside of the box, as the Kid suggests. There's also shielding paint that can be used.
wow, nice looking CBG.
I did my first wiring job recently and found that I had the hum and when I touched the strings or bridge, it went away- however, I plugged the guitar in the basement to test after raising the p-90s closer to the strings and their was no longer a hum. I now wonder if the strings may have been to far away from the pickups to create the hum. Left me perplexed, but I am not electrician and am learning. LOL
Small buzz at home is probably shielding/grounding in the guitar. Mass buzzing in the club is more likely the circut the amp was plugged into.
The problem might have been solved by simply plugging the amp into a different receptacle.
An AC Outlet Ground Tester can come in pretty handy.
OK thanks all for the input.. should see him this week and get started...
Forgot.. Bridge is NOT grounded.. this was my first with a Volume Pot and Yes grounded on the back...
Aaaannnnd we have a winner! See? Told ya: figured it out yourself. "Has anybody seen The Bridge? Where's that confounded Bridge?"
Ground that sucka to the back of the Vol pot, make sure of your solder joint, and Problem will have found Solution.
tunnel a wee cable up under one of the pennies, bobs ur fathers bruther.. but um.. are those strings not coming thru from inside??
the bridge is justs a means of earthing the strings, you dont gotta earth the bridge at all, make way to those ball ends captain !
The strings are through the entire Box and I just figured out to solder the Rivets that the strings are going through to the ground inside the box.. The no one will ever know, I was just learning about my first volume pot ground.....