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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Thu Jan 19, 2012 7:33 pm
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Thanks for help... but like I said nothing has changed... it sound the same as it did before I started.. I think it just needs new and better pickups at this point... but I will go back and solder the tape seams... little over kill... my carvin has a aluminum shield on the control cover..

and I read on a few forums to rap the pickups like I did.. I think I saw a link to it on a few posts back..


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Thu Jan 19, 2012 9:27 pm
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No-- you should do what Brother Dave said. He knows. Those links are not right. You didn't properly do the shield job so the problem did not go away. You don't need all that foil you put on the pickups and control plate. Save some cash and start all over. When removing the foil tape from the pickups be very carefull you don't break any wire or the pickups are hosed and then you WILL need to buy new ones. Even with copper shielding it will still be possible to get hum in certain situations like neon lights- improper volts in house current etc.


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 3:29 am
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brotherdave wrote:
......... But, I see a couple of things that went wrong here.



I'm glad to see I'm not the only one


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 5:38 am
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OK I get it..... but wouldn't you think the buzz would have changed just a little if it was from bad shielding????

OK today
**I will remove the copper from the pickups
I don't have anymore copper tape but, I have some aluminum foil tape I can put on the pickguard,
**I will remove the copper from the control plate
**I will reuse what copper I have to shield the bridge pickup cavity
I didn't use one of the screws on the bridge because there needs to be a groove cut in the body to get the wire close enough to do that.. but I did use a new wire and I fanned out the wire so it made good contact with the bridge without holding it up off the body
**I will cut a groove to one of the screws
**I will put all the extra ground wires to the ground on the 1/4 output

>>>>>should I leave the grounds I have that run between the pods and the output jack????<<<<<

My bet is nothing will change, I'll post back when I'm done..


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 6:00 am
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You need copper tape around the pickups for no noise. I write ; around , not underneat or on top.

I do these mods like your's (copper tapes on guitar/ pickups ) lots of time with success, very quiet after that. Your job must have the same results,

If no, you forget something or do something wrong like copper under and on top of pickups and maybe some other things.

In the case of noise, you can do the job 90 % right but the 10 % you forget is enough to scrap your job.

Study " How to " before doing some more work.
___________________________________________________________________________________________
Look at Stewart McDonald for more information; Here , about single coil pu

http://www.stewmac.com/freeinfo/Electro ... -3789.html


Single coils
This is not recommended on vintage or rare pickups. This is a delicate job that may be better left up to a professional. This may also reduce some high end frequency from the pickup.

A great deal of the hum and buzz associated with single coil pickups can be eliminated by using this shielding kit as you will shield the coil as well as the output wire. The shielding of the output wire also allows you to switch the phase of the pickup (swap hot for ground) while still maintaining your shielding network.

Remove the pickups from the pickguard assembly and make note of which lug is hot and which is connected to ground. Be sure not to damage the two fine copper wires that exit the windings and are soldered to the wire lugs on the base of the bobbin. Carefully remove the pickup cover to expose the windings and/or protective tape. If the cover appears to be glued to the lower bobbin plate, stop and consult with an expert.

Wrap the coil with a strip of the black electrician's tape. Starting in the area of the two lugs on the lower bobbin plate and be sure to overlap the tape at least 1/2". Prepare to wrap the coil with the 1/2" copper foil tape by trimming it down to 7/16" then cutting a piece long enough to wrap once around the windings and overlap itself by 1/4". Remove all but 1/2" of the protective backing and start to wrap the foil around the bobbin. Start with the end of the foil that still has 1/2" of backing on it in the area of the solder lugs. Wrap the tape around the bobbin and overlap it over the part that still has the paper backing. From outside to inside in the area of the wire lugs you have the following layers: foil, foil, paper backing, black tape, black tape, windings. The paper is left in the area of the overlap because it reduces the risk of getting the area too hot when soldering and shorting out the windings. Before soldering you will want to check to be sure the cover can still be installed.

Cut a piece of the two conductor plus shield wire (included) the same length as the pickup's lead wires. Strip back 3/4" of the outer gray insulation on both ends and separate the outer braided shield from the brown and white wires. Twist the outer braid into a stranded wire and strip back 1/8" of the insulation off the brown and white wires. Carefully tin these wires. Using your VOM (Volt/Ohm Meter), check for shorts that may have occurred due to overheating one of the wires.

_This is from Stewart McDonald


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 6:29 am
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Looking online at what is available for custom shielding , it seems I only need to cover the back/floor of the pickup cavities. They sell a flat plate that just sits on the bottom.... I looked around at these because there is no way I can put copper tape on all three sides of the bridge pickup cavity, the pickup fits way to tight into the cavity and pushes the tape to the bottom..

So do I just need to tape the floor???


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 6:40 am
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Or conductive black paint, but some more money ........


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 6:50 am
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Thanks for that link.... it makes sense to use shielded cables, again that's how my Carvin is wired guess they got it right.
Got a new list and heading to the store..
one step at a time..

One thing I'm confused about is the shielding on the control cover... why over lap the shielding coming out of the cavity if the cover is not to be connected to the shielding...


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 6:59 am
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Just read this... sooooo

Cover plates & pickguards
Use the self-adhesive copper foil on the back of control cavity covers and pickguards. Be sure the foil on your cover plate or pickguard will come in contact with the shielding applied in the cavity it covers. When shielding pickguards, the foil only needs to be applied in the area of the control cavity.


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 7:20 am
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clevor wrote:
..

One thing I'm confused about is the shielding on the control cover... why over lap the shielding coming out of the cavity if the cover is not to be connected to the shielding...


All ground ( AND copper shield) MUST be connected together. By a wire or by overlapping.


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 9:44 am
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stratele52 wrote:
All ground ( AND copper shield) MUST be connected together. By a wire or by overlapping.



I understand that.. but someone told me to remove the copper from the control cover..


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 12:57 pm
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OK I went back in....

***I solder all the foil joints....

Image


***I replaced the wiring from the pods to the pickups with 2 conductor shielded wire


Image


***I put some aluminum shielding behind the pickguard and I checked it after I screwed it down and I'm getting continuity between the copper foil in the control cavity and the screws that hold the pickgaurd in place. So I'm confidant it's making a good connection and is grounded..

Image

***I even add a copper strip to make contact with the aluminum and soldered it inside the cavity

Image

*** I added a copper strip to the bridge cavity and grounded it to the control cavity.... I know I know the wire was too short to go to the output jack so I solder it to where I grounded the cavity.. it's fine..

Image

*** I put just a strip of copper around the pickups... and grounded it to the shield inside the new wire.. bad picture but ya get it.

Image

*** I cut a groove in the body to get a better ground on the bridge

Image

The wiring is a lot cleaner using the shielded wire a lot cleaner..


Image


*******And nothing has changed and taking the copper off the pickups and control cover wont change a thing I sure........

*** It sound the as it did before I started.. if it was a shielding issue I think something would have changed....

Time for some new and better Pickups...


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Post subject: Re: Jass Bass Buzzzzzzzzzz
Posted: Fri Jan 20, 2012 3:09 pm
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stratele52 wrote:

I do these mods like your's (copper tapes on guitar/ pickups ) lots of time with success, very quiet after that. Your job must have the same results,

If no, you forget something or do something wrong like copper under and on top of pickups and maybe some other things.

In the case of noise, you can do the job 90 % right but the 10 % you forget is enough to scrap your job.


You work hard on this bass. I can't say more


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Post subject: Re: Jazz Bass Buzzzzzzzzzz
Posted: Wed Jan 25, 2012 6:16 am
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I didn't say to take the copper off the control plate. I said it was redundant. The control plate is ferrous metal, therefore it is SHIELDED. Adding or removing copper will make NO DIFFERENCE. Copper shielding something without grounding it turns it into an RFI antenna, especially when you wrap it around single coil pickups.

I'm beginning to wonder if you have some sort of impedance or cable problem. If the entire pickup cavity and control cavity are shielded, using shielded pickup cable will not make much difference.

You did check the bridge contact of course?


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Post subject: Re: Jazz Bass Buzzzzzzzzzz
Posted: Thu Jan 26, 2012 5:11 am
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brotherdave wrote:
I didn't say to take the copper off the control plate. I said it was redundant. The control plate is ferrous metal, therefore it is SHIELDED. Adding or removing copper will make NO DIFFERENCE. Copper shielding something without grounding it turns it into an RFI antenna, especially when you wrap it around single coil pickups.

I'm beginning to wonder if you have some sort of impedance or cable problem. If the entire pickup cavity and control cavity are shielded, using shielded pickup cable will not make much difference.

You did check the bridge contact of course?



Yes I have good ground to the bridge...

I did reverse the polarity on one of the pickups and now when both volumes are full the buzz is gone... the guitar now acts just like my Ibanez... which has no buzz at full volume but as soon as you reduce either volume the buzz comes back but very faint...
Nothing like before...

reversing the polarity is the only thing that has changed the buzz..

The owner of the bass told me it has always buzz like mad from day one (1995), never played it because it was so bad. So he is going to buy some pickups $100.00 not to bad..


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