It is currently Mon Mar 16, 2020 12:38 pm

All times are UTC - 7 hours



Post new topic Reply to topic  [ 35 posts ]  Go to page 1, 2, 3  Next
Go to page 1, 2, 3  Next
Author Message
Post subject: Jazz Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 10:16 am
Offline
Hobbyist
Hobbyist
User avatar

Joined: Wed Jan 18, 2012 10:08 am
Posts: 21
I have shielded everything, grounded everything.. and still it buzzzzes... I have three other Guitars a Carvin LB75P, Schecter 4 string and an Ibanez 5 string.. and those don't hum or buzz..

I bought some copper foil tape and covered the pickups and the control cavity.. then I added ground wires to the pickup foil and cavity foil and all the pods and 1/4 plug...

Any ideas..

Image

Image

Image

Image

added the red wire for extra ground..

Image


Thanks Steve.....


Last edited by clevor on Sat Jan 21, 2012 6:33 am, edited 1 time in total.

Top
Profile
Fender Play Winter Sale 2020
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 2:41 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Fri Feb 05, 2010 4:31 am
Posts: 14048
Location: Province de Québec, Canada
You forget to tell someting OR to do something for sure.

ALL copper shields must have a ground wire between them and go to the guitar ground. All is meaning ; cavity + pot plate+ pickups. No ground wire betwen them is like no shielding

The copper shied you put under the pots IS the pot gound . Remove your red groud wire , this do a ground loop and could make noise.

Never double a ground, make only one but a good ONE.

Come back with some news.


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 3:02 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Wed Jan 18, 2012 10:08 am
Posts: 21
Nothing has changed... I just added the red wire across the pods and to the 1/4 input jack and from the jack to the inside cavity.. before I did that it was just the extra grounds from the shielding on the pickups...

The one thing I didn't do is solder the joints in the copper shielding, which is next... But nothing has changed it's the same as it was when I started... If you pull the volume back on the pickups it goes away... I don't see where soldering all the joints in the tape is going to make it any better....


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 3:08 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Wed Jan 18, 2012 10:08 am
Posts: 21
OK I will put all the grounds.. from the pickup shielding, Bridge and Cavity to the 1/4 input jack and see what happens.. in the last pic, the Yellow/red wires are the grounds from the copper foil around the pickups.. I will move them to the 1/4 jack but should I keep the red ones I added..


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 4:24 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Fri Feb 05, 2010 4:31 am
Posts: 14048
Location: Province de Québec, Canada
clevor wrote:
OK I will put all the grounds.. from the pickup shielding, Bridge and Cavity to the 1/4 input jack and see what happens.. in the last pic, the Yellow/red wires are the grounds from the copper foil around the pickups.. I will move them to the 1/4 jack but should I keep the red ones I added..



That's right . Every part/cavity with copper shield should go to the guitar ground. pot or output jack. No input jack : )


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 4:33 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Wed Jan 18, 2012 10:08 am
Posts: 21
stratele52 wrote:
That's right . Every part/cavity with copper shield should go to the guitar ground. pot or output jack. No input jack : )



Input/output... the only 1/4 jack in the guitar.. my bad... I still don't see how that's going to change a thing.. all the pods are grounded to the cover, the output jack is grounded to the cover.. the red wire is grounded to everything.. the grounds coming from the shields I put around the pickups are grounded to the pods.. and still the buzz is exactly the same nothing has changed... tomorrow I will move the grounds from the pickup shielding to the output jack but I don't see it changing anything.. it's all grounded.. :?:


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 4:50 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Fri Feb 05, 2010 4:31 am
Posts: 14048
Location: Province de Québec, Canada
You don't talk about the 2 grounds from your 2 pickups CAVITYS .

All of other grounds seem good , those on cavitys are missing IMO.


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 5:01 pm
Offline
Aspiring Musician
Aspiring Musician
User avatar

Joined: Wed Jan 14, 2009 10:54 am
Posts: 438
Location: Alabama, Michigan, Florida, Wisconsin, Mississippi and Tennessee seasonally
`
`
`

You may not like my suggestion, but this is something that J-Bass players have done to remedy the situation for many years.

It looks as if the pickups in your photos are standard J-Bass pickups which means that they are single wind coils. Therein lies the problem. Using standard FACTORY wiring configuration, unless you set BOTH volume controls to the exact same setting, there will be hum. The other way around this is to replace the pickups with 'noiseless' style such as the DiMarzio DP149 or DiMarzio DP249. There are others available from leading manufacturers but the DiMarzios work well and depending upon the model you choose, can duplicate the original sound or enhance the lows at your choice while eliminating hum.

The noiseless pickups are multi-wind which phases the coils in such a way as to null ambient noise. With noiseless pickups, you can use one pickup or the other or both at different settings and you will not hear hum as with the originals. Keep in mind that in most J-Basses until quite recently, the Neck Pickup is slightly shorter than the Bridge Pickup. Measure yours to verify this. The DiMarzios listed above are replacements for the pickups that are different lengths.


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 5:40 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Wed Jan 18, 2012 10:08 am
Posts: 21
stratele52 wrote:
You don't talk about the 2 grounds from your 2 pickups CAVITYS .

All of other grounds seem good , those on cavitys are missing IMO.


The neck cavity is shielded with the copper foil in a continuous piece from the control cavity (see picture) and the bridge pickup cavity is not shielded... I figured the pickups are rapped in foil and grounded how much shielding does it need.. so why bother...

I think it's going to need new pickups... years back I had a Jazz and I replaced the pickups for tune reasons, don't remember any buzzes or hums from that one and it was a Mexican Jazz like this one..

and if I turn the volume controls the buzz changes...

Thanks all for the help... I'll post back and let you know what happens..


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 6:00 pm
Offline
Professional Musician
Professional Musician

Joined: Sat Feb 12, 2011 8:01 am
Posts: 2842
DUDE that is some serious copper. Your bass must weigh alot more now. You know all Jazz pickups will buzz in most cases unless you turn them both up all the way. I think that's the nature of the beast. I think the copper is a bit of overkill. Don't get mad but you don't need that much to do the job. Also you could go buy some Noiseless Jazz pickups, Right?


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 6:09 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Wed Jan 18, 2012 10:08 am
Posts: 21
stroker vance wrote:
DUDE that is some serious copper. Your bass must weigh alot more now. You know all Jazz pickups will buzz in most cases unless you turn them both up all the way. I think that's the nature of the beast. I think the copper is a bit of overkill. Don't get mad but you don't need that much to do the job. Also you could go buy some Noiseless Jazz pickups, Right?



The copper is just foil tape it don't weigh anything... and when I turn these up all the way it buzzes like mad.. I have to turn them both down a tad and it much better.. you should see the inside of my Carvin it is completely covered in copper and it is the quietest out of all my basses no noise at all....


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 6:16 pm
Offline
Hobbyist
Hobbyist
User avatar

Joined: Wed Jan 18, 2012 10:08 am
Posts: 21
My Carvin..
Image


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Wed Jan 18, 2012 9:43 pm
Offline
Professional Musician
Professional Musician

Joined: Sat Feb 12, 2011 8:01 am
Posts: 2842
Image

Image

Image

Image

Hey I wasn't serious about the wieght thing! I guess if you have done everything you can maybe you can take it to a repair guy .


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Thu Jan 19, 2012 12:26 am
Offline
Hobbyist
Hobbyist

Joined: Tue Dec 20, 2011 1:34 am
Posts: 11
Judging from the photos

1. Consider a star ground; solder all the ground wires(wires from pickups, bridge pickup cavity, bridge, pots (lift the pot shell ground lug and ground the lifted on the star) and output jack) on one of this lug (could be other, whatever works)
Image
and screw/solder the star lug inside the main cavity
http://www.talkbass.com/wiki/index.php/ ... ature_Bass
more advance method involve a signal ground and a shield ground
http://www.guitarnuts.com/wiring/shielding/shield3.php

2. Shield the Pickguard, and make sure it is connected to the body ground(touching is fine)
http://www.stewmac.com/tradesecrets/ts0 ... lding.hzml
(hzml? i checked it)
http://www.guitarnuts.com/wiring/shielding/tele.php

Like they said in these articles, no shielding is 100% perfect, good luck :D


Top
Profile
Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Thu Jan 19, 2012 6:38 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Thu Aug 07, 2008 3:12 pm
Posts: 6355
Location: Albemarle, NC
Good job on the control cavity copper. But, I see a couple of things that went wrong here.

1. By applying copper foil to the back of the pickup itself you have essentially installed an RFI antenna to the pickup to attract MORE RFI instead of shielding it to get less! There needs to foam or some other insulator between the pickups and the copper, otherwise you make the problem worse.

Shield the CAVITIES. Don't apply the copper to the pickup itself. The pickups need to be insulated from the shield to ground. It is best to ground the shielding attached to the interior of both of the pickup cavities. I've never seen anyone put copper tape on pickups before. I guess it looked like a good idea at the time.

When shielding the pickup cavity shield the entire cavity. You only want the front of the pickups exposed. Everything else should be encased in copper.

2. Copper shield the back of the pickguard as this can help quiet the neck pickup. Overlap the copper coming out of the neck pickup cavity onto the top of the instrument exactly like you did on the control cavity so the copper on the back of the pickguard will be in the ground circuit.

3. I don't see where you did anything to the bridge ground. I'm assuming you lifted the bridge and secured the ground wire to one of the screws, right?

4. It was redundant to copper shield the interior side of the metal control plate, but other than wasting time and copper tape, no harm done.

I know you put a lot of time into this already but you really should go back and correct these things. Also soldering the tape seams is a great idea and something I do on a single coil instrument.

Good luck.


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 35 posts ]  Go to page 1, 2, 3  Next
Go to page 1, 2, 3  Next

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: