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AKG C-414 B-ULS TL II - Intermitant noise problem

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November 4, 2004 12:38:06 AM

Archived from groups: rec.audio.pro (More info?)

Hi everyone,

I've got an AKG C-414 B-ULS TL II with a noise problem.

I'm getting sound, through but with a little more hiss and the
biggest problem is every few seconds there's like a "pumping"
noise that'll happen 1-4 times, then stops and does it again after
a bit. It doesn't happen at regular intervals....

Anyone have an idea what it could be?

Has anybody has this happen before?

Perhaps the 2 large Caps are going?

Any help is appreciated.

Thanks.

Mario
Anonymous
November 4, 2004 12:38:07 AM

Archived from groups: rec.audio.pro (More info?)

On Wed, 3 Nov 2004 21:38:06 -0500, "Vortex" <nospam@overhere.com>
wrote:

>Hi everyone,
>
>I've got an AKG C-414 B-ULS TL II with a noise problem.
>
>I'm getting sound, through but with a little more hiss and the
>biggest problem is every few seconds there's like a "pumping"
>noise that'll happen 1-4 times, then stops and does it again after
>a bit. It doesn't happen at regular intervals....
>
>Anyone have an idea what it could be?


It could be moisture. Leave the mic on overnight and place it in
front of a loudspeaker, table radio, or anything that will give the
capsule(s) something to do. Any excess wet should be cooked an shaken
out by morning.



http://liondogmusic.com
Anonymous
November 4, 2004 7:30:47 AM

Archived from groups: rec.audio.pro (More info?)

<< It could be moisture. Leave the mic on overnight and place it in
front of a loudspeaker, table radio, or anything that will give the
capsule(s) something to do. Any excess wet should be cooked an shaken
out by morning.
>>



Don't know about the shaking, but I used to dry a U87 that had too much breath
moisture build up by placing it a couple feet above a 50 watt lamp for a few
hours.

Scott Fraser
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Anonymous
November 4, 2004 7:30:48 AM

Archived from groups: rec.audio.pro (More info?)

On 04 Nov 2004 04:30:47 GMT, scotfraser@aol.com (ScotFraser) wrote:

><< It could be moisture. Leave the mic on overnight and place it in
>front of a loudspeaker, table radio, or anything that will give the
>capsule(s) something to do. Any excess wet should be cooked an shaken
>out by morning.
> >>


>
>Don't know about the shaking, but I used to dry a U87 that had too much breath
>moisture build up by placing it a couple feet above a 50 watt lamp for a few
>hours.
>
>Scott Fraser

Done that, too on real stubborn units or if I'm in a hurry.



http://liondogmusic.com
Anonymous
November 4, 2004 1:42:55 PM

Archived from groups: rec.audio.pro (More info?)

In article <20041103233047.21876.00000038@mb-m14.aol.com>,
ScotFraser <scotfraser@aol.com> wrote:
><< It could be moisture. Leave the mic on overnight and place it in
>front of a loudspeaker, table radio, or anything that will give the
>capsule(s) something to do. Any excess wet should be cooked an shaken
>out by morning.
> >>


>
>Don't know about the shaking, but I used to dry a U87 that had too much breath
>moisture build up by placing it a couple feet above a 50 watt lamp for a few
>hours.

That is often a sign that the diaphragm has become dirty, and that the dirt
is absorbing moisture and becoming conductive. Certainly capsule cleaning
would not hurt once you have verified that drying it out fixes the problem.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
Anonymous
November 4, 2004 1:45:33 PM

Archived from groups: rec.audio.pro (More info?)

A friend of mine likes to tell the tale of when he was a tape op and there
was some really obnoxious client demanding all the U87's they had, one of
which had a slightly damp capsule. To get things moving quick and avoid
further abuse, he attempted to dry it with a hair dryer placed, so he
thought, at a safe enough distance that it couldn't possibly damage the gold
foil .............



"Vortex" <nospam@overhere.com> wrote in message
news:fvgid.20402$dj2.1060420@news20.bellglobal.com...
> Hi everyone,
>
> I've got an AKG C-414 B-ULS TL II with a noise problem.
>
> I'm getting sound, through but with a little more hiss and the
> biggest problem is every few seconds there's like a "pumping"
> noise that'll happen 1-4 times, then stops and does it again after
> a bit. It doesn't happen at regular intervals....
>
> Anyone have an idea what it could be?
>
> Has anybody has this happen before?
>
> Perhaps the 2 large Caps are going?
>
> Any help is appreciated.
>
> Thanks.
>
> Mario
>
>
>
November 7, 2004 9:32:03 AM

Archived from groups: rec.audio.pro (More info?)

Some 414 mmodelss have switches that become noisy, in particular-move
the hii-pas from side to side a number of times.


micha
>
>"Vortex" <nospam@overhere.com> wrote in message
>news:fvgid.20402$dj2.1060420@news20.bellglobal.com...
>> Hi everyone,
>>
>> I've got an AKG C-414 B-ULS TL II with a noise problem.
>>
>> I'm getting sound, through but with a little more hiss and the
>> biggest problem is every few seconds there's like a "pumping"
>> noise that'll happen 1-4 times, then stops and does it again after
>> a bit. It doesn't happen at regular intervals....
>>
>> Anyone have an idea what it could be?
>>
>> Has anybody has this happen before?
>>
>> Perhaps the 2 large Caps are going?
>>
>> Any help is appreciated.
>>
>> Thanks.
>>
>> Mario
>>
>>
>>
>
Anonymous
November 8, 2004 11:00:14 AM

Archived from groups: rec.audio.pro (More info?)

In article <i5gro019anvghmk90q16q8cucucln4ao8g@4ax.com>, ms <micha@att.net>
wrote:

> Some 414 mmodelss have switches that become noisy, in particular-move
> the hii-pas from side to side a number of times.
>
>
> micha
> >
> >"Vortex" <nospam@overhere.com> wrote in message
> >news:fvgid.20402$dj2.1060420@news20.bellglobal.com...
> >> Hi everyone,
> >>
> >> I've got an AKG C-414 B-ULS TL II with a noise problem.
> >>
> >> I'm getting sound, through but with a little more hiss and the
> >> biggest problem is every few seconds there's like a "pumping"
> >> noise that'll happen 1-4 times, then stops and does it again after
> >> a bit. It doesn't happen at regular intervals....
> >>
> >> Anyone have an idea what it could be?
> >>
> >> Has anybody has this happen before?
> >>
> >> Perhaps the 2 large Caps are going?
> >>
> >> Any help is appreciated.
> >>
> >> Thanks.
> >>
> >> Mario
> >>

I had a similar problem that turned out to be due to transformer failure: yes,
there is a transformer in the TL II, but not in the direct signal path. (It
feeds phantom power to the capsule.)

-Jay
--
x------- Jay Kadis ------- x---- Jay's Attic Studio ------x
x Lecturer, Audio Engineer x Dexter Records x
x CCRMA, Stanford University x http://www.offbeats.com/ x
x---------- http://ccrma.stanford.edu/~jay/ ------------x
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