My Les Paul is noisy! Video!

Re: My Les Paul is noisy! Video!

The two usual culprits I have found over the years are the output jack wired backwards or bad pots. Bad/noisy pots are hard to diagnose because you have to physically remove them all from the ground path and check them one at a time by wiring a pickup to a pot and then directly to the jack.

Change out your pots and $10 says the hum goes away.
 
Re: My Les Paul is noisy! Video!

if the hum stops when you touch the strings, then obviously you have a good bridge ground. that's not arguable. if your bridge ground was disconnected or nonexistant, you could touch the strings all you want and the hum wouldnt change a single bit.

Actually, you've got that backwards. If the hum goes away when you touch the strings it is because you DON'T have a good ground connection, and your body is creating the ground making the hum go away. Grounding gets rid of hum.
 
Re: My Les Paul is noisy! Video!

No, but it isn't part of your ground path, it's attatched to it?

The ground path from bridge to jack plug should be 0 Ohms, as with the grounding to your pups , pots and anything else that is grounded. Anything above about 2 Ohms is heaps. My Epi LP and My Framus are both Zero Ohms.
You should be able to measure between any grounding points and get 0 Ohms. Any resistance = a bad connection.:scratchch

+1!!
 
Re: My Les Paul is noisy! Video!

24 ohms, and it kills that high buzz when it's connected.

That's not bad for a chrome-plated piece of pot metal. My meter leads clock in at 0.4 ohms. Every non-ideal conductor (meaning the ones in guitars) has a non-zero resistance. Compared to the DC resistances of the pots and pickups, 24 ohms is very small. Ever measure conductive paint used for shielding control cavities?

You need to calibrate your meter leads to zero. Otherwise that inaccuracy is conveyed to every reading you take. It doesn't matter what the actual resistence is in your leads due to the type of metal, length and thicknes of the wire, etc. Your meter needs to be calibrated so that quantity is taken out of the equasion for all other readings.
 
Re: My Les Paul is noisy! Video!


Quote:
Originally Posted by rumblebox
the fact that the noise stops when he touches the strings shows that everything is in perfect working order, but it simply lacks proper shielding.



Wrong. No matter how large your type is, that statement is still wrong.
 
Re: My Les Paul is noisy! Video!

Could be bad ground connections on pots or even bad grounds within the pots. That will give the same symptoms as bad ground to bridge (since all grounds are connected and should be continuity). In any case it still equals to a bad ground.

Every connection has to be checked (resoldered).

Check continuity between the end of the wire from the bridge in the control cavity to the bridge itself (if you don't get zero resistence the bridge wire is not connected to the post).

If you still have the same hum, replace all of your pots and redo all your wiring.

Use a hot enough iron so that the solder flows like water. If the solder blobs up, you are not getting a proper solder joint (usually from an iron that isn't hot enough). I know what I'm talking about here...I've been soldering for 60 years...I was a plumber and an electrician.
 
Re: My Les Paul is noisy! Video!

Quote:
Originally Posted by rumblebox
the fact that the noise stops when he touches the strings shows that everything is in perfect working order, but it simply lacks proper shielding.



Wrong. No matter how large your type is, that statement is still wrong.



And i dont care how many posts you have. Its not going to ground through your body at all when you touch the strings unless the bridge ground is connected.
 
Re: My Les Paul is noisy! Video!

And i dont care how many posts you have. Its not going to ground through your body at all when you touch the strings unless the bridge ground is connected.

It has nothing to do with number of posts, it has to do with electrical IQ.

If the bridge is already connected to ground, then touching the strings will not ground it further and there will be no change...no hum when properly grounded, therefore further grounding (through the body) will not make a difference.

Yes, the body does, ...let me say that again... the body does ground a circuit.

It's ridiculous to even argue this point. You can say that 2 + 2 = 3 all you want, but it doesn't change the facts.

Let's first get something out in the clear...I'd like to know, where are you getting the idea that the body doesn't ground a circuit? Have you got a reference that we can review? Did you read it on the internet? Did a friend tell you that? Are you just assuming that? What? Where did you come up with this idea?

"Shock current path
As we've already learned, electricity requires a complete path (circuit) to continuously flow. This is why the shock received from static electricity is only a momentary jolt: the flow of electrons is necessarily brief when static charges are equalized between two objects. Shocks of self-limited duration like this are rarely hazardous.

Without two contact points on the body for current to enter and exit, respectively, there is no hazard of shock. This is why birds can safely rest on high-voltage power lines without getting shocked: they make contact with the circuit at only one point.



In order for electrons to flow through a conductor, there must be a voltage present to motivate them. Voltage, as you should recall, is always relative between two points. There is no such thing as voltage "on" or "at" a single point in the circuit, and so the bird contacting a single point in the above circuit has no voltage applied across its body to establish a current through it. Yes, even though they rest on two feet, both feet are touching the same wire, making them electrically common. Electrically speaking, both of the bird's feet touch the same point, hence there is no voltage between them to motivate current through the bird's body.

This might lend one to believe that its impossible to be shocked by electricity by only touching a single wire. Like the birds, if we're sure to touch only one wire at a time, we'll be safe, right? Unfortunately, this is not correct. Unlike birds, people are usually standing on the ground when they contact a "live" wire. Many times, one side of a power system will be intentionally connected to earth ground, and so the person touching a single wire is actually making contact between two points in the circuit (the wire and earth ground): "
 
Re: My Les Paul is noisy! Video!

i didnt read your whole post, but without a ground wire connecting to the bridge, tailpiece, trem springs, etc etc, your body has no pathway to ground the guitar by touching the strings. it's no different from touching a piece of wood or plastic on the body at that point.

cut your bridge ground and see if your body grounds the guitar when you touch the strings. it wont.
 
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Re: My Les Paul is noisy! Video!

Could be bad ground connections on pots or even bad grounds within the pots. That will give the same symptoms as bad ground to bridge (since all grounds are connected and should be continuity). In any case it still equals to a bad ground.

Every connection has to be checked (resoldered).

Check continuity between the end of the wire from the bridge in the control cavity to the bridge itself (if you don't get zero resistence the bridge wire is not connected to the post).

If you still have the same hum, replace all of your pots and redo all your wiring.

Use a hot enough iron so that the solder flows like water. If the solder blobs up, you are not getting a proper solder joint (usually from an iron that isn't hot enough). I know what I'm talking about here...I've been soldering for 60 years...I was a plumber and an electrician.

Could the bridge have a partial ground? When I pull on the bridge wire it doesn't move, so I assum e it is at least wedged into the post hole. If it has an "ok" solder joint (ie, loose) would it partailly ground the system? I will have to wait until tomorrow to really check all my connections. Thanks everyone - I'm going down both paths here (shielding and grounding issue) so we should come to some resolution.

My concern is that the bridge isn't fully connected and I'll have to pull the bushing out of the body - not something I relish...
 
Re: My Les Paul is noisy! Video!

Could the bridge have a partial ground? When I pull on the bridge wire it doesn't move, so I assum e it is at least wedged into the post hole. If it has an "ok" solder joint (ie, loose) would it partailly ground the system? I will have to wait until tomorrow to really check all my connections. Thanks everyone - I'm going down both paths here (shielding and grounding issue) so we should come to some resolution.

My concern is that the bridge isn't fully connected and I'll have to pull the bushing out of the body - not something I relish...


did you check each pot ground from the lug to the housing?
 
Re: My Les Paul is noisy! Video!

You need to calibrate your meter leads to zero. Otherwise that inaccuracy is conveyed to every reading you take. It doesn't matter what the actual resistence is in your leads due to the type of metal, length and thicknes of the wire, etc. Your meter needs to be calibrated so that quantity is taken out of the equasion for all other readings.

Thanks for the advice. It's a shame it didn't occur to me to bring home the good meter that I use at work. :rolleyes: For this kind of crap, I'll live with a 0.4-ohm offset for two days.
 
Re: My Les Paul is noisy! Video!

My concern is that the bridge isn't fully connected and I'll have to pull the bushing out of the body - not something I relish...

dont do that. i promise you, no matter what anyone else says, your bridge ground is not the problem. otherwise it would not go quiet when you touch the strings. you already confirmed this when you disconnected it to test it.
 
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Re: My Les Paul is noisy! Video!

If it has an "ok" solder joint (ie, loose) would it partailly ground the system?

Yes. Ground connections with higher resistance (ex., 24 ohms vs. 0.3 ohms) may be less effective but still do something.

My concern is that the bridge isn't fully connected and I'll have to pull the bushing out of the body - not something I relish...

Eh, it'll be okay. Worst case, you'll have tool marks on a bridge post, super glue on the bushing, and a boot print on the top of your guitar. :naughty:
 
Re: My Les Paul is noisy! Video!

dont do that. i promise you, no matter what anyone else says, your bridge ground is not the problem. otherwise it would not go quiet when you touch the strings. you already confirmed this when you disconnected it to test it.

I cannot wait for the OP to get this thing on the bench of someone who's been past second base with a soldering iron.
 
Re: My Les Paul is noisy! Video!

yea i'm pretty curious to see what it is too. i'm always pretty liberal with my ground wires and shielding. better safe than sorry.
 
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Re: My Les Paul is noisy! Video!

I'm amazed that no one has made a joke about Ohm's slaw, or something to that effect.
 
Re: My Les Paul is noisy! Video!

My concern is that the bridge isn't fully connected and I'll have to pull the bushing out of the body - not something I relish...
There's an easy way to do that.
Unscrew the stud.
Drop a small sheet metal screw(or tiny ball bearing) into the bushing.
Screw the stud back down, when you feel resistance keep torquing down, but slowly.
The bushing will rise up out of the hole.
Replace tiny screw with slightly larger one if needed.
Once high enough, it should be easy to remove with pliers.

To replace just tap back down using a hammer and a piece of wood to protect the bushing.

I still think it's your JP wiring ground.
Maybe a bad solder. Maybe a ground loop between the pots.
 
Re: My Les Paul is noisy! Video!

I don't have much time today, but I was able to test the bridge with a multimeter.

With my meter set on 20 ohms, I placed one lead on the output jack and the other on the bridge. It came back with a reading of zero.

I did the same with all my guitar and they all came back zero.

Does that help or say anything?
 
Re: My Les Paul is noisy! Video!

Well, it's clear at this point that the nut isn't filed properly.

Seriously? 0.0 ohms on all of them? What do you get if you cut one of them? (Don't worry, dude, it'll grow back.)
 
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