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EUB sound interference

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herry tze

Post subject: EUB sound interference

Posted: Tue Dec 25, 2012 2:56 am

Cocobolo

Joined: Sat Aug 14, 2010 10:50 am
Posts: 361
First name: herry
Last Name: trismono
City: malang
State: east java
Zip/Postal Code: 65142
Country: Indonesia
Focus: Build
Status: Amateur

Hello, I need help my problem as seen on my pictures.
This is my first Electric Upright Bass, I built from Motolla Libellula EUB Plan, 35 scale 4/4
And I use Piezo Under Saddle Pickup, I built from coax (from Experiment Musical), and the PreAmp I bought from Walter Cafe PZP-1.
there is some sound interference when I put my hand on the top of PreAmp cavity cover, all inner cavity I shielded with bronze foil from StewMac.
I've check the ground of pot and the ground of jack connected with the shielding, is that the problem?
And what should I do.. thank's and I will soon post the picture of this guitar...
And Merry Christmas to all of you... pizza

edit: picture pickup ground (black wire) I've released and move to the one other pin on jack (the medium tall)

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