my same old problem again

hagopick

hagopick

New member
I posted my problem 2 times monthes ago and i could't find an answer ,i'll not stop posting it till i find the secret,here we go. i replaced the stock humbuckers of my jackson kelly with screaming demon in the neck amd PG n in neck,its 1 volume without tone ,3 way swithching .noise occuring on preamp on high gain settings thats something was't with the stock pickups ,while their output was higher (the detonator bridge is about 20k).the noise is in the posesion 1 and 3,no noise in the 2nd.the wiring was perfect ,nothing overheated,the red and white soldered perfectly and isolated,the humbucker is not splitting ,the both coils are working i tested them.i measured them too the output is right.so the noise level depending on my standing posesion of the place,i mean when i turn90 degres left or right the noise getting less ,up and down is making a diffrence too.i'm doubting from my switch and the volume pot,there's something wrong in my volume pot that hapened after the replacing the humbuckers,when its open to 10 i tap it gently the sound cuts off,and the switch in the 2nd posesion (the noiseless one)being noisy like the other posesions when i move it gently up and down. this noise problem is not being so big one for me cause im not playing on very high gain settings but i need to know what's the problem, is it from the guitar or the pickups.
 
Re: my same old problem again

when you talk about rotating 90 degrees and having the noise get quieter, that suggests that you are picking up electromagnetic interference (like from a CRT computer screen or television)

so improving the shielding and grounding is going to have the best results

you mention 'preamp' but you don't tell us where the preamp is and what the preamp is ... it could be the source of the noise and have nothing to do with the pickups themselves ...

when you talk about tapping the volume and having things change, that suggests a cold solder joint ... so recheck all the solder connections

good luck
t4d

i hope you are a non-native english speaker because it is really hard to figure out what you are saying ... your refusal to put a period at the end of a sentence (or an ellipse if you're fancy :D ) makes it damn near impossible for me to know when one fact ends and a knew one begins ... if you are a non-native speaker, then congratulations on being able to get even that much across ...
 
Re: my same old problem again

there's not a tv or computer in the place.and the preamp is the amplifire's one its not making a problems with other guitars.thank you for mentionig the cold soldering thing i did't thinked of it,i'll check them.
i'm really sorry for my english i'm armenian living in arabic country,i'm trying hard to learn better.
 
Re: my same old problem again

I'd say you have two problems:

#1 a grounding problem, probably caused by a defective pot (like the volume you mentioned)

#2 Your guitar isn't shielded properly, so you pick up interference. Try to get one of those shielding kits, that might help.

Btw: The hum should cut off more when you touch anything connected to ground (the strings, the bridge, etc.), but there shouldn'tbe that much of it in the first place.
 
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Re: my same old problem again

If you are little interference at one angle and you turn 90 degrees and get a lot of interference, there is without doubt SOMETHING in the immediate vicinity causing it. There doesn't have to be a computer or TV in the room -- you could have a junction box inside the wall or an appliance on the other side of the wall or any number of things inside the wall or in the next room causing the interference.
 
Re: my same old problem again

Zhangliqun said:
If you are little interference at one angle and you turn 90 degrees and get a lot of interference, there is without doubt SOMETHING in the immediate vicinity causing it. There doesn't have to be a computer or TV in the room -- you could have a junction box inside the wall or an appliance on the other side of the wall or any number of things inside the wall or in the next room causing the interference.
Click to expand...

That "SOMETHING" is the transformers in the amp itself. :laugh2: Look inside any amp and you'll see that the power tranny and output tranny are always mounted with one tranny at a right angle to the other...otherwise you'd get even more hum. He needs to stand further away from the amp...although there may be a grounding issue with the guitar too. Lew
 
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Re: my same old problem again

Kommerzbassist said:
I'd say you have two problems:

#1 a grounding problem, probably caused by a defective pot (like the volume you mentioned)

#2 Your guitar isn't shielded properly, so you pick up interference. Try to get one of those shielding kits, that might help.

Btw: The hum should cut off more when you touch anything connected to ground (the strings, the bridge, etc.), but there shouldn'tbe that much of it in the first place.
Click to expand...
I checked the groundings they are perfectly well soldered,besides that ,i tryed a many kind of groundings in different places on the pot.
and for the guitar i didnt understant how it isn't shielded properly.(please do me a favor and explain it more,maybe i can solve it).
in speaking of hum it is cutting off when i touch the strings and tremolo,but its still over the normal hum.
 
Re: my same old problem again

Zhangliqun said:
If you are little interference at one angle and you turn 90 degrees and get a lot of interference, there is without doubt SOMETHING in the immediate vicinity causing it. There doesn't have to be a computer or TV in the room -- you could have a junction box inside the wall or an appliance on the other side of the wall or any number of things inside the wall or in the next room causing the interference.
Click to expand...
what you saied is 100% i tried it with very cheap guitars,and its worked well.but why there is't such a noises with other guitars i tried them in the same place and amp ,without take a ground wire from another room or the buildings ground wire,even my cheap epiphone haven't this kind of problems.
 
Re: my same old problem again

On top of the ground issues you might have (along with a damaged pot), switching from pickups with ceramic mags to pickups with alnico mags might increase your noise floor. This is because an alnico mag is metal based and might act as an antenna.
 
Re: my same old problem again

Benjy_26 said:
On top of the ground issues you might have (along with a damaged pot), switching from pickups with ceramic mags to pickups with alnico mags might increase your noise floor. This is because an alnico mag is metal based and might act as an antenna.
Click to expand...
ok ,so do you think its somekind normal.you know what,(its something relaxble to hear such a news). but what you think about being dead silent when i switch to 2nd posesion?.another resonable idea about this matter and i'll be complatly relaxed .i'll rewire the groundings like you saied,but i'll say something i'm afraied you all laugh on me,i remember my old ibanez once i had (roadstar seriesII).the tone knob on it was a switch in the same time(push),it's job was reversing polarity or something like that.it was cutting off the noise ,i didn't see this thing on other guitars ,never. do you have any idea about doing such a this on this damed guitar ??.
thank you.
 
Re: my same old problem again

finally i foud something ,the volume pot is damaged, scratching badly when i turn it up and down ,i shoted a cleaninig spray on it and it still scrathing ,it needs to replace.i don't know if it will shut the noise down ,but at least i founded something ,
i thank all of you for helping me ,and sorry for bothering you with my english.
you were so friendly,this forume is the best.
 
Re: my same old problem again

hagopick said:
and for the guitar i didnt understant how it isn't shielded properly.(please do me a favor and explain it more,maybe i can solve it).
Click to expand...
So basically, if you spray some conducting laquer inside your control & pickup cavity or put conducting foil there (both can be bought at guitar shops, just ask and let them tell you how to use it) and connect that with ground, it'll act like a shield against interference. (You can think of it like that: The unwanted interference from outside would, without shielding directly go until it hits your electronics. Now if we have shielding around the waves that hit the shielding before they hit the electronics will go to ground)

hagopick said:
in speaking of hum it is cutting off when i touch the strings and tremolo,but its still over the normal hum.
Click to expand...
Yes, there will still be some hum regardless ofwhat you are doing.
 
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