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  • From: Chris Rossi <nospam AT spacelabstudio.com>
  • To: RTP-area local music and culture <ch-scene AT lists.ibiblio.org>
  • Subject: Re: Tech Geek Post: Misbehaving Guitar
  • Date: Sat, 24 Mar 2007 15:54:40 -0400

grady wrote:
Some questions:

1) does it act more or less the same regardless of which pickup you're switched to?

Mostly neck pick up. Occasionally the middle pick up, but to a less extent. Couldn't make the bridge pick up do it just now, so maybe it is immune. There's also with this guitar, like most guitars, noise that changes or goes away when you touch the strings. Interestingly, this noise is not present with the bridge pickup--ie taking my hands on or off the strings doesn't change the noise characteristics of the guitar with this pickup, but does with the other pickups. I suspect some sort of electrical interaction with my body is at the root (my electric personality), so I suppose figuring out why the bridge pickup is immune, might help me figure out how to fix the bridge and middle pickups.

Possibly the dryer sheet the manufacturer stuffed under the pick guard is bunched up near the bridge? I haven't opened it up yet to check their handiwork. Maybe tonight.

2) how does the position of your right hand w/r/t the bridge change when you're playing chords with the pick vs single notes or fingerpicking?

Not much.

3) What exactly does this circuit look like (I haven't had a guitar open in 22+ years, and that one was a real POS anyway)? Specifically, if you took it DI through a transformer DI with a ground lift, could you cut this ground wire entirely & still get signal, so as to confirm/deny that the wire is the issue? Or could you readily reconfigure the circuit so as to make that happen? I'm asking because you honestly don't know for sure that it isn't one of the pickups, or something funky in one of the pots. It seems mechanical, but . . .

Haven't opened up the main cavity yet, just the cavity in the back for the bridge/groundplate. But here's a schematic:

http://www.glguitars.com/schematics/Legacy_schematic_drawing.pdf

This doesn't make complete sense to me, though, since the connection between the bridge and the ground plate is made via the springs that tension the bridge. There is no black wire from the bridge to the ground plate as the schematic shows. Maybe there should be?

chris




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