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post #1 of 17 (permalink) Old 09-28-2007, 08:10 AM Thread Starter
 
Join Date: Oct 2006
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Hum Problem

I took my custom swirl back to the luthier who assembled it last week because it had a hum in it. The hum isn't the worst I've ever heard, but enough to bug someone. So, I go to pick it up yesterday and he says he couldn't find any unusual hum in it anywhere. Come to find out he doesn't have an amp in the shop that has gain on it and a pure clean tone kinda masks the problem. He says I need to get a can of conductive shielding paint from stew-mac and paint the inside of the control cavities. He said that whenever you have a hum that goes away when you touch the strings it is a shielding issue. I always thought it was a grounding issue. I can touch the springs, the strings or the bridge and it gets quiet. What do you guys say to that? I'm willing to order the paint and try that, I just hate to paint over the swirl, ...even though I leave the control cavity covers on and just leave the spring cover off. This is a new thing for me because none of my factory guitars do this hum thing requiring shielding, at least not that I've heard while playing at home at decent volumes.
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post #2 of 17 (permalink) Old 09-28-2007, 08:23 AM
 
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Re: Hum Problem

A better idea would to go to Warmoth's site and order the shielding tape... its like copper i think? and it should do just a good a job as the paint probably better, and you can always remove it. try that

I might even try taking it to another tech... because if there is a problem... there is a solution, and its gunna be better than tape. I think if you take it to another tech if you can and get him to re-soder the thing, it might work.
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post #3 of 17 (permalink) Old 09-28-2007, 08:26 AM
 
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Re: Hum Problem

Also check that your amp is not making any noise. Sometimes when you have hum through your amp, it can run anywhere it wants.

Jimmy
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post #4 of 17 (permalink) Old 09-28-2007, 08:32 AM Thread Starter
 
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Re: Hum Problem

On the amp consideration, ...none of my other guitars make the hum through the amp, not the Gibson SG, or the Prestige. Are factory guitars manufactured with some shielding coating or something in pickup and control cavities? If so, that would explain why I need it since the swirl has none.

Funny, ...the guy said specifically "get the paint, ...do NOT use tape." I have a soldering iron. I can run through the connections and resolder them myself if you think that might make a difference.

I guess I should add that this axe is coil tapped so I can play in either mode. I don't know if that complicates things as far as necessitating that shielding be used.

Last edited by tt0511; 09-28-2007 at 09:03 AM.
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post #5 of 17 (permalink) Old 09-28-2007, 09:26 AM
 
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Re: Hum Problem

Check your earth (ground) continuity from the trem spring hanger back to your control pots.
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post #6 of 17 (permalink) Old 09-28-2007, 10:02 AM
 
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Re: Hum Problem

Although I've never soldered any guitar parts myself, I'm wondering if there's shielded wire you can get for it? Is the tape the guy was referering to the same as the stuff Carvin outfits on their guitars?

http://www.carvin.com/products/singl...ber=WS1&CID=EP

I would paint the cavity and then use the shielding kit as well. It can't hurt to have extra shielding.

Jimmy
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post #7 of 17 (permalink) Old 09-28-2007, 10:42 AM
 
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Re: Hum Problem

Sounds like you're guitar has a ground problem, Check this out http://www.guitarnuts.com/wiring/index.php
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post #8 of 17 (permalink) Old 09-28-2007, 11:15 AM Thread Starter
 
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Re: Hum Problem

Quote:
Originally Posted by Necrojem View Post
Sounds like you're guitar has a ground problem, Check this out http://www.guitarnuts.com/wiring/index.php
Hmm. I didn't find anything in that article relating to why you think I have a grounding problem.? When I got the guitar back from assembly the first time, it was real loud. I noticed he forgot the ground wire from the volume pot to the spring clip so I added one myself. It should be grounded correctly now if I understand where to route it correctly. I found this article and it confirms precisely what the luthier said, that this is electrostatic hum caused by interference and is eliminated by shielding:

http://www.neelyguitars.com/Pickups.html

If you read the paragraph on electrostatic noise and shielding you'll see what I mean. Also, the article on "guitarnuts.com" you posted does mention that over the past few years, manufacturers have been putting a coating for shielding on their guitars to take care of the problem. This might explain why my SG (1995 model) and my new prestige do not have the problem. I've not opened their covers to see if the cavities have any kind of "recognizable" coating, but what they use might not be visible like this dark gray paint coating from stew-mac.
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post #9 of 17 (permalink) Old 09-28-2007, 11:33 AM
 
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Re: Hum Problem

The last paragraph had a little info on shielding, nothing better then what everybody else has already said, it's a cool site in general though.
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post #10 of 17 (permalink) Old 09-28-2007, 12:06 PM Thread Starter
 
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Re: Hum Problem

Sounds to me like shielding is the answer. I'll give it a whirl, though I hate to paint that on there. At least it's covered up with the cover plates.
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post #11 of 17 (permalink) Old 09-28-2007, 12:22 PM
 
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Re: Hum Problem

I hope you can resolve the problem, its worth a go and tell us if it works.
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post #12 of 17 (permalink) Old 09-28-2007, 12:40 PM
 
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Re: Hum Problem

Long shots that could be worth trying first:-

Try it with the pickguard off ... when it was installed last a bit of existing shielding could be causing a short.

or

Try reversing the leads at the Jack, they could be wrong.

Hope you solve it.
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post #13 of 17 (permalink) Old 09-28-2007, 03:05 PM
 
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Re: Hum Problem

Thats sucks with the humming issue. Keep us updated on that. I seem to learn something new through you. LOL!!!

Obviously were doing the same thing just about.

I have a date set to bring my swirly to the luthier up in my neck of the woods. This guy locally is well known up here in Boston. I know he did work for Aerosmith and the the bassist from Yes. The guitar should be in good hands. After all he has many years of a great reputation. I'm going to bring up if it needs shielding. 2nd week of October.
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post #14 of 17 (permalink) Old 09-28-2007, 03:21 PM Thread Starter
 
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Re: Hum Problem

Quote:
Originally Posted by TicTac in my eye View Post
Thats sucks with the humming issue. Keep us updated on that. I seem to learn something new through you. LOL!!!

Obviously were doing the same thing just about.

I have a date set to bring my swirly to the luthier up in my neck of the woods. This guy locally is well known up here in Boston. I know he did work for Aerosmith and the the bassist from Yes. The guitar should be in good hands. After all he has many years of a great reputation. I'm going to bring up if it needs shielding. 2nd week of October.
Cool Man! I can't wait to see yours together. Pretty neat coincidence on the Aerosmith thing. I know my luthier works on Joe Perry's axes, or has in the past. He did some work for Jimmy Page in guitar development, works on Clapton's axes, lot's of big names. That's why I go there, ...plus, he does a setup like nobody's business, ...I suppose the Plek machine doesn't hurt either!

I'll let you know how the paint works out. At least it's water based. That should mean it could be removed from the clear coat theoretically. That's nice to know!
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post #15 of 17 (permalink) Old 09-28-2007, 03:24 PM Thread Starter
 
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Re: Hum Problem

Quote:
Originally Posted by Sunrise View Post
Long shots that could be worth trying first:-

Try it with the pickguard off ... when it was installed last a bit of existing shielding could be causing a short.

or

Try reversing the leads at the Jack, they could be wrong.

Hope you solve it.
This is a rear routed body so removing the p.g. wouldn't do anything, but thanks for the thought. That's a great idea for front routing though. I don't think it's bad enough to be the input jack, but another good idea. It doesn't do it on clean tones much. Seems like it would be worse if that were it. I'll look the wiring over compared to schematic though and see if it looks like that's an issue for sure before painting. Thanks.
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cavity cover , clean tone , clear coat , coil tap , custom swirl , jimmy page , joe perry , local music store , music store

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