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-   -   String noise/squeek (http://www.diyaudio.com/forums/instruments-amps/227564-string-noise-squeek.html)

Robert Kesh 11th January 2013 09:18 PM

String noise/squeek
 
The guitar amp I'm making seems to amplify string sliding noise more than is usual. Does anyone know what frequency this typically occurs at, so I can filter it?

Bone 11th January 2013 09:35 PM

Add a treble cut control or get some flatwound strings :) The frequency will vary depending how closely the strings are wound and how fast you move your fingers!

Robert Kesh 11th January 2013 09:38 PM

I guess, but it seems to have particular spike to it, like sibilance.

And yes, I'm going to roll off the highs, but I'd like some idea of where I should aim for.

tinitus 11th January 2013 09:41 PM

Quote:

Originally Posted by Robert Kesh (Post 3321612)
The guitar amp I'm making seems to amplify string sliding noise more than is usual.

why :confused:

Robert Kesh 11th January 2013 09:53 PM

Quote:

Originally Posted by tinitus (Post 3321653)
why :confused:

Perhaps because the tone stack hasn't been put in? Other than that, not sure yet. My first build of an amp, and kind of my own design, in that it's cobbled together from bits and pieces and ideas from elsewhere.

Two 6N11s and an LM3875.

It probably just needs a treble roll off as has been said. At the moment it has nothing rolling off the high end except grid stoppers.

tinitus 12th January 2013 08:09 PM

could it be the opposite, and that you have less than usual low end amplifying
so when you cranck it up your top gets too hot

don't know, but maybe its just a matter of wrong input resistors, or some other simple thing

JMFahey 12th January 2013 09:38 PM

Quote:

String noise/squeek
The guitar amp I'm making seems to amplify string sliding noise more than is usual. Does anyone know what frequency this typically occurs at, so I can filter it?
Short answer, don't.
You will kill sparkle, brightness, definition.
Improve your chording and firger technique and you won't have problems.
Just curious: what speakers are you using?
Is it the one you showed lying on the table, without a proper cabinet?
If so, correct that first, you are killing mid and bass big time, so only treble is left.

Robert Kesh 13th January 2013 11:54 PM

Quote:

Originally Posted by JMFahey (Post 3322921)
Short answer, don't.
You will kill sparkle, brightness, definition.
Improve your chording and firger technique and you won't have problems.
Just curious: what speakers are you using?
Is it the one you showed lying on the table, without a proper cabinet?
If so, correct that first, you are killing mid and bass big time, so only treble is left.

It's a Marshall Goldback. Yes, that one on the desk, though it's back in its cab now, and still squeaky, though less so. I've been playing guitar for maybe 30 yrs, so I don't think it is particularly technique, as my technique hasn't caused a problem on other set ups.

But yes, not enough mid and bass may be the issue.

Quote:

Originally Posted by tinitus (Post 3322833)
could it be the opposite, and that you have less than usual low end amplifying
so when you crank it up your top gets too hot

As was said here too.

Thanks guys, am going to have a tweak.

cyclecamper 16th January 2013 10:02 AM

High gain can make handling noise as loud as playing.

phase_accurate 17th January 2013 02:05 PM

I tend to the same answers as tinitus:

Did you make a coarse check of frequency response ? Maybe some coupling C is too small or something else is giving you a insufficient low-end response.

As already mentioned the frequency response of guitar pickups is very load dependant. Electrically (i.e. without looking at things like PU position, pole size, single-coil or humbucker etc) they usually form a second order lowpass with a peak before the final drop. Your amp might be unluckily loading the PU(s) in such a way that you end up with the peak in an unpleasant frequency range.

Regards

Charles


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