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FDP Forum / Fender Bass Guitars and Bass Amps / Do I have a shielding problem?

MaGr80

East Coast

Mar 7th, 2012 05:15 AM   Edit   Profile   Print Topic   Search Topic

When I rub my hand across the backside of the control cavity area on some of my early 70's fenders, I can hear a crackling sound through my amp. Is this normal?

gblick

USA

Mar 7th, 2012 10:55 AM   Edit   Profile   Print Topic   Search Topic

Sounds like static electricity is being generated when you rub your hand on it, and then discharging through the output jack to the amp.

I had this happen with my Precision. The plastic pickguard would build up static electricity and discharge it through the output jack to the amp. I shielded the entire underside of the pickguard with a self-adhesive copper foil sheet, making sure that it went under and made a connection with the pots and output jack, and that eliminated the static buildup.

Bubbalou
Contributing Member
**********

USA

THE LOW END OF UPPER TEJAS
Mar 13th, 2012 05:23 AM   Edit   Profile   Print Topic   Search Topic

gblick +1

Steve Dallman
Contributing Member
*****

Merrill, Wisconsin

Ain't turned 60, but I got my blinker on
Mar 16th, 2012 08:17 AM   Edit   Profile   Print Topic   Search Topic

I've had static problems in guitars that did have metal shielding. I cut a dryer sheet to fit between the pickguard and body. That takes care of it.

heynorm

Omaha, USA

Mar 18th, 2012 07:59 PM   Edit   Profile   Print Topic   Search Topic

Ditto on the used dryer sheet. I keep one in each of my electric's cases.

wrnchbndr
Contributing Member
*******

New Jersey

The otters threw me out
Mar 19th, 2012 08:44 AM   Edit   Profile   Print Topic   Search Topic

I've seen this problem a few times in my shop and I've heard about the dryer sheet on the guitar forum. If you go to the McMasterCarr website they reference PVC as being a conductive material. We all know that PVC doesn't actually readily conduct but there may be some sort of element of of dielectric property to it and the pickguard is acting like a capacitor. If the static isn't messing you up enough to cause a problem when you are playing I would suggest that you just chalk it up to a "gee-wiz-that is odd" thing and not worry about it. I tend to think that is just a seasonal thing from low humity and it will go away.

Bubbalou
Contributing Member
**********

USA

THE LOW END OF UPPER TEJAS
Mar 19th, 2012 11:09 AM   Edit   Profile   Print Topic   Search Topic

Two types of shielding material. One is aluminum that has a non conductive adhesive that I have seen used on pickguards. I first used aluminum foil backing on stock pickguard and it got rid of about 90% of the static problem. I then bought a new pickguard and I used copper shielding with electrically conductive adhesive on the back of my Tele pickguard and not only did it completely stop the static problem but reduced the noise too. I made sure to keep it 1/8" away from the neck pickup's cutout area.

Steve Dallman
Contributing Member
*****

Merrill, Wisconsin

Ain't turned 60, but I got my blinker on
Mar 20th, 2012 09:25 AM   Edit   Profile   Print Topic   Search Topic

We had one Telecaster come in that had the worst pickguard I've ever encountered. We tried an aluminum shield, copper shielding (with the shields grounded solidly), static dryer sheet, anti-static spray, etc.

Finally, we tried a different guard which had NO static problems even without shielding or dryer sheet. Both guards were from Fender and were visually identical. Go figure.

Bubbalou
Contributing Member
**********

USA

THE LOW END OF UPPER TEJAS
Mar 20th, 2012 12:38 PM   Edit   Profile   Print Topic   Search Topic

Steve, I am convinced different plastics react differently to static buildup. Maybe Fender switched up manufacturers or the manufacturer changed something in the process. Who knows.

uncle stack-knob
Contributing Member
**********
****

united kingdom

Mar 22nd, 2012 03:30 AM   Edit   Profile   Print Topic   Search Topic

I have encountered more than one or two earlier seventies Fenders that incorporated factory installed shielding.
Notably one Stratocaster that came in for work, and it even had a factory ground wire connecting the jack cavity to ground. That particular guitar had a bad " crackle static " issue.
It is just my opinion, but at that time I think the actual poly finish was conducive to static build and charge, which may have been aggravated by the material used to line cases and so on.
Maybe they didn't ground out their buffing machines or something like that.

Stack-Knob.

Bubbalou
Contributing Member
**********

USA

THE LOW END OF UPPER TEJAS
Mar 22nd, 2012 05:55 AM   Edit   Profile   Print Topic   Search Topic

Stack, that sounds very plausable and you may have hit the nail right on the head there.

gblick

USA

Mar 22nd, 2012 07:29 AM   Edit   Profile   Print Topic   Search Topic

When I was having the problem, the thought did cross my mind that it could also have something to do with the poly finish. The finish was perfect at the time and very smooth, and I always kept it very clean and never used any kind of wax or anything. I imagine that if the finish is all beat up and not real clean, it would be much less likely to build up the static charge. But that copper foil sheet that I put on the underside of the pickguard did the trick and I've never had a pop, crackle, or sizzle since.

(This message was last edited by gblick at 07:30 AM, Mar 22nd, 2012)

FDP Forum / Fender Bass Guitars and Bass Amps / Do I have a shielding problem?




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