pickup grounding?

[Will Little]

I have a fishman m100 pickup, I think I have some grounding problems and am looking to the advice of the board for solutions.

I get a typical ground hum unless I'm touching the metal input jack, sometimes it's more bothersome than others but it's always there.

Solutions?

[SiFi]

G'day Will,

I have the same problem with the built in pickup in my Fender. Can't offer any solution unfortunately but would love to hear from any others who have had success reducing/eliminating hum...

Cheers,

Simon

[Les]

G'day Will Little & SiFi.
I had a bridge pickup that had a nasty hum.
I thought it was an earth problem.
My solution was to run a piece of thin wire from the output jack to the tail piece - a drop of solder at each end.
It worked, but not being too knowledgable about electric current, I often wondered if I had become an earthing rod - ouch!
Les.

[mandroid]

I did something similar, from the shield of the pickup(Fender Lace sensor) wire to the tailpiece.
http://www.mandolincafe.net/iB_html/non-cgi/emoticons/blues.gif http://www.mandolincafe.net/iB_html/non-cgi/emoticons/blues.gif

[Rroyd]

I don't know about the Fishman, but I had an electric that hummed until I would touch the strings. I ran a ground wire from the metal bridge plate to the ground side of the jack, which cured it, but I made sure that all the equipment had three conductor plugs so that the polarity was the same in all of the sound gear. The hundred or so volts we measured between a microphone and the strings on a guitar that was plugged into an amp with the polarity switch set wrong made us realize why we could see sparks between the guitarist's lips and the microphone in a dark nightclub, and why he would complain loudly that something was wrong.