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Really fat noise on my AT4060

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Really fat noise on my AT4060

Postby reverbddl » Sat Feb 15, 2020 3:50 pm

Hello.

I 've this big noise going out from my mic AT4060 ( tube mic ) when I test it :

https://soundcloud.com/user-537983156/at4060/s-RPgjp

Any Idea of what it can be ?
I've changed the tube, but it's the same

Thanks for help
Manu
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Re: Really fat noise on my AT4060

Postby MOF » Sat Feb 15, 2020 4:11 pm

I’m no electronics expert but I would guess it’s a power supply problem, maybe capacitors need replacing.
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Re: Really fat noise on my AT4060

Postby Kwackman » Sat Feb 15, 2020 4:16 pm

From the specs, I think this mic requires it's own PSU, a AT8560.
Are you using one?
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Re: Really fat noise on my AT4060

Postby reverbddl » Sat Feb 15, 2020 4:32 pm

Yep, This mic use its own power supply AT8560 ( this is a tube mic).

The noise is coming when I speak louder in the mic, and can stop if i knock it a little.
Thank you for your help.
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Re: Really fat noise on my AT4060

Postby MOF » Sat Feb 15, 2020 4:44 pm

The noise is coming when I speak louder in the mic, and can stop if i knock it a little.
Thank you for your help.
That implies dirty contacts or a dry joint. The former requires cleaning contacts, with power off take the valve out and then put it back in repeatedly to scrape away any oxide that’s built up. The latter will require re-soldering the faulty joints.
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Re: Really fat noise on my AT4060

Postby reverbddl » Sat Feb 15, 2020 4:50 pm

yep, I've already done moving (and changing ) the tube,
resoldering the high Z diod to the capsule, clean lots of solders. but the problem is still there.

May be a faulty capsule ??
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Re: Really fat noise on my AT4060

Postby MOF » Sun Feb 16, 2020 4:03 am

I’m wondering if my original thought about a capacitor is right and not the dirty contacts.
A discharging capacitor would give that pitch change.
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Re: Really fat noise on my AT4060

Postby Hugh Robjohns » Sun Feb 16, 2020 10:57 am

That sounds like what used to be called 'motorboating' and is an indication of an unstable amplifier which has gone into oscillation.

I'd recommend returning the mic to your local AT repair centre because that's going to nee some careful assessment and repair work.

H
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