|Strat Hater ||10-09-2013 11:53 PM |
I bought an Ibanez SR 375 last week. It has a bad hum that goes away when you touch the strings, however when you let off on the strings it is right back there. Here is the message I got from the tech who is working on it. I am confused!
"I looked at the bass. Hum goes away when touching strings. This means that circuit, bridge, & strings are grounded properly. The cavity is shielded and all the wiring look fine. All the frets are level but I adjusted the truss rod to get rid of fret board buzz. I also smoothed the fret ends, they were pretty sharp. You can pick up the guitar tomorrow if you like."
Any help would be appreciated.
|JasonLamb ||10-10-2013 02:16 AM |
It needs to be shielded with copper tape or a good shielding paint...factory shielding is usually not enough.
If it gets better when touching the strings the internal (electronics cavity) shielding isn't good. But that is normal.
|Chainsaw Willie ||10-10-2013 03:14 PM |
Sometimes it is easy to sheild the cavity, but forget to ground the sheilding. Make sure that the foil (or concuctive paint) has a solid electrical connection to the outer ring of the output jack. Same for the foil on the back of the pickguard. I had this same problem with conductive paint before. A woodscrew, a ring crimp lug, and a wire to the jack fixed the paint sheilding. Foil type sheilding should have a ground wire soldered to it, or be mechanically clamped down when a switch,or pot, or output jack, tightened down.
|eriky4003 ||10-10-2013 03:17 PM |
If the hum is a B, it is a 60 Hz hum. Unless you want to go the shielding route, I'd recommend buying an ElectroHarmonix HumDebugger. Works great for myself.
|DiabolusInMusic ||10-10-2013 03:18 PM |
As others have said, you have a shielding issue, not a grounding issue. The shielding is either not grounded or loses continuity somewhere. Most techs think that 60hz hum is not an issue, heck even some major manufacturers don't (See: Fender), it is definitely an issue that needs to be corrected. Give the bass a shielding job and the issue will be resolved. I do not recommend an external fix for an internal problem.
Do not pay a tech for a shielding job, it will cost you considerably less to buy a soldering iron and the parts required than it would for the hour of tech time.
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