#1
I own a Schecter C-1 classic which has a seymour duncan JB in the bridge and a 59 in the neck. Both have metal covers. I've been having trouble with feedback, even at reasonable volumes. I have my gain at about 6 giving me a rock tone (far from saturated) and the volume is usually only about 2.5 since its a very loud amp.

My amp is a Laney LH50R tube half stack (about 15 years old). I run my guitar straight into my amp with no effects. The cable I use isn't super cheap but not expensive either. I've ordered some high quality cables (but I don't expect them to make a difference with the feedback).

Basically, I can't play a riff that has any breaks in it. When I start a song, I try and turn the volume up on my guitar as quick as possible before I start playing but the riff but as soon as I get my volume about 3/4 up on my guitar the humming/ringing starts. Its not a high pitched squeal. I can use an old RG370dx with crappy ibanez stock pickups and I get 0 feedback. Thats why I'm wondering if its the seymour duncans.

Does anyone know if wax potting the seymour duncans (JB and 59) will help, or would they already be potted by the manufacturer?

Thanks for reading.
#2
They're already potted so that shouldn't be the issue.
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#3
well one thing you could try first is removing the covers, those tend to cause feedback, too much metal for the magnets basically, they should be potted already from schecter, theyre really good about quality. Id remove the covers, a guitarist in another band had a c1 classic with gold plated hardware and i popped the covers off and it immensly helped him
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#4
Quote by dertjoe
well one thing you could try first is removing the covers, those tend to cause feedback, too much metal for the magnets basically, they should be potted already from schecter, theyre really good about quality. Id remove the covers, a guitarist in another band had a c1 classic with gold plated hardware and i popped the covers off and it immensly helped him


Thanks for the reply. When you say it helped him, was that in terms of feedback or something else?
#5
Quote by dertjoe
well one thing you could try first is removing the covers, those tend to cause feedback, too much metal for the magnets basically, they should be potted already from schecter, theyre really good about quality. Id remove the covers, a guitarist in another band had a c1 classic with gold plated hardware and i popped the covers off and it immensly helped him


Since when do pickup covers cause feedback?

My guess is either you have a low output model that has not been waxed or something is mucked up.
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#6
microphonic tubes? check that out as well
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#7
Quote by H4T3BR33D3R
Since when do pickup covers cause feedback?

My guess is either you have a low output model that has not been waxed or something is mucked up.

When they're not potted correctly.

I bet your problem is one of the covers came loose.
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You CAN play anything with anything....but some guitars sound right for some things, and not for others. Single coils sound retarded for metal, though those who are apeshit about harpsichord probably beg to differ.
#8
Quote by oneblackened
When they're not potted correctly.

I bet your problem is one of the covers came loose.

This. A loose pickup cover can give you some of the most vicious microphonics you'll ever hear.

Make sure the adjustable polepieces aren't loose as well, overzealous adjustment of them canmake them vibrate a little.

It could also be the guitars wiring at fault, especially as your described the noise as 'humming' rather than the high pitched squeal we normally associate with pickup microphonics. Do you get any noise/pops when you touch metal parts of your guitar like the strings or bridge?


H4T3BR33D3R: AFAIK all of Seymour Duncan's standard production models are wax potted.
#9
Quote by kyle62
This. A loose pickup cover can give you some of the most vicious microphonics you'll ever hear.

Make sure the adjustable polepieces aren't loose as well, overzealous adjustment of them canmake them vibrate a little.

It could also be the guitars wiring at fault, especially as your described the noise as 'humming' rather than the high pitched squeal we normally associate with pickup microphonics. Do you get any noise/pops when you touch metal parts of your guitar like the strings or bridge?


H4T3BR33D3R: AFAIK all of Seymour Duncan's standard production models are wax potted.

Only SH-55 Seth Lover models aren't.
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Peavey Revalver 4, UAD Friedman BE100/DS40
Adam S3A monitors
Quote by Anonden
You CAN play anything with anything....but some guitars sound right for some things, and not for others. Single coils sound retarded for metal, though those who are apeshit about harpsichord probably beg to differ.
#10
Quote by oneblackened
Only SH-55 Seth Lover models aren't.

Was wondering about that. It's only really the specialist vintage-style stuff that doesn't get the potting (the Seth Lover is their PAF clone isn't it?).
#11
It's one of them. They have multiple PAF clones. '59, Alnico 2 Pro, Pearly Gates, Seth Lover, plus the custom shop models and the Antiquities.
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Peavey Revalver 4, UAD Friedman BE100/DS40
Adam S3A monitors
Quote by Anonden
You CAN play anything with anything....but some guitars sound right for some things, and not for others. Single coils sound retarded for metal, though those who are apeshit about harpsichord probably beg to differ.
#12
I had an unpotted '59 that was ordered custom, Seth Lover and Antiquities and none were potted. It's ironic, I had all those as well as a set of Wolfetone PAF copies that are also unpotted and none of them squeal. All have covers. They all have a slightly microphonic ringing to them when you play a note, but that's why I got them unpotted...
#13
99% certain this is not a pickup issue. Even unpotted pickups, unless they're really old and bad, won't make that much noise when you're not playing. Plus, it would be excessively rare for both of them to go microphonic at the same time.

I think what you're dealing with here is a microphonic preamp tube.
#14
Quote by Roc8995
99% certain this is not a pickup issue. Even unpotted pickups, unless they're really old and bad, won't make that much noise when you're not playing. Plus, it would be excessively rare for both of them to go microphonic at the same time.

I think what you're dealing with here is a microphonic preamp tube.

I don't think so... His ibanez works fine, no squealing.
Current Gear:
LTD MH-400 with Gotoh GE1996T (EMG 85/60)
PRS SE Custom 24 (Suhr SSH+/SSV)
Ibanez RG3120 Prestige (Dimarzio Titans)
Squier Vintage Modified 70s Jazz V
Audient iD22 interface
Peavey Revalver 4, UAD Friedman BE100/DS40
Adam S3A monitors
Quote by Anonden
You CAN play anything with anything....but some guitars sound right for some things, and not for others. Single coils sound retarded for metal, though those who are apeshit about harpsichord probably beg to differ.
#15
While reading the original post, I immediately ignored everything he said about his pickups when he stated two things:

1: it occurs at reasonable volumes. Pickup feedback from unpotted pickups causes feedback most often at high volumes.

2: his 15 year old TUBE halfstack. Microphonic preamp tube(s) are likely the cause of lower-volume feedback. God Only knows (or maybe the OP) how old those preamp tubes are.

I'd say find those preamp tubes, grap a pencil with an eraser and start tappin'.

MY next question would be, how often have you went back and forth between the supposed "bad" guitar and the good one, to make sure you aren't just getting intermittent feedback that is disguising itself (timing-wise) as isolated to one guitar?
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Last edited by ConfederateAxe at Jan 10, 2010,
#16
Quote by ConfederateAxe
While reading the original post, I immediately ignored everything he said about his pickups when he stated two things:

1: it occurs at reasonable volumes. Pickup feedback from unpotted pickups causes feedback most often at high volumes.

2: his 15 year old TUBE halfstack. Microphonic preamp tube(s) are likely the cause of lower-volume feedback. God Only knows (or maybe the OP) how old those preamp tubes are.

I'd say find those preamp tubes, grap a pencil with an eraser and start tappin'.

MY next question would be, how often have you went back and forth between the supposed "bad" guitar and the good one, to make sure you aren't just getting intermittent feedback that is disguising itself (timing-wise) as isolated to one guitar?


The feedback does not occur when using the Ibanez. I've used the ibanez on the amp a lot more than the schecter. I've noticed that the feedback basically only occurs when using the bridge pickup (JB) of the schecter. I found that if I stand far away and behind a wall I will not get any feedback. I took the pickup out to see if the cover was loose but it seemed fine.

I've made a recording of the feedback. I'm playing riffs with gaps, to show how annoying it is. I've also recorded a test where I lightly tap the preamp tubes with a wooden pencil (I removed the metal casings and tapped the glass). I tap each tube 4 times, starting from 1 to 4. 1 gives a louder sound, which decreases as I move from 1 to 4.


amp test.mp3 - 1.09MB

#17
Quote by kyle62
This. A loose pickup cover can give you some of the most vicious microphonics you'll ever hear.

Make sure the adjustable polepieces aren't loose as well, overzealous adjustment of them canmake them vibrate a little.

It could also be the guitars wiring at fault, especially as your described the noise as 'humming' rather than the high pitched squeal we normally associate with pickup microphonics. Do you get any noise/pops when you touch metal parts of your guitar like the strings or bridge?


H4T3BR33D3R: AFAIK all of Seymour Duncan's standard production models are wax potted.


I haven't noticed any difference when I touch metal parts as you said, but the bridge pickup does seem to be microphonic. Heres a test where I tap the pickups with my pick at a lower volume (no feedback). I tap the neck pickup first, then the bridge pickup (which has the feedback). Theres a big difference as you can hear.

pickup test.mp3 - 0.43MB

Does the hum that I've shown in my previous post sound typical of a pickup problem?
Last edited by robert_says at Jan 12, 2010,