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Neumann U87 fading in and out

The sound comes and goes over a 2 sec period. 2 on 2 off. sounds to me like it might be a prob with phantom power the way that it fades in and out. let me know if there is any ideas.

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Re: Neumann U87 fading in and out

Posted on Dec 11, 2009

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My u87 cuts out when you get to close but comes back on in 2 secs seems to be wind pressure from singing. many thanks Graham

problem is a dirty capsule caused when fogged with humidity from breath it shorts out temporarily. it maybe possible to have it professionally cleaned but may need to be replaced. DO NOT USE FOAM POP FILTERS. Spend the money on a metal one. back off if you wanna save some loot.

May 18, 2011 | Neumann U87 Professional Microphone

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My U87 microphone won't power signal. does anyone know why this may be happening?

Was it working fine before it stopped powering up? The U87 is a condenser microphone so maybe the reason it is not powering up is because the phantom power on your interface was not turned on. Plug the U87 into your preamp and then switch on the phantom power (48V) to get it powered up. If that doesn't help, there must be an internal fault within the microphone or in your preamp.

Mar 02, 2011 | Neumann U87 Professional Microphone

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Neumann TLM mic is inoperative when connected to PA with same cable that worked with Shure SM 58 mic

The Shure SM58 is a dynamic microphone instead of the electret one Neumann TLM 103. This means that Shure does not need a phantom power supply voltage, instead of Neumann TLM 103; this one needs 48Volts. Here are the specifications for each one of the microphones: Shure SM 58 - Neumann TLM 103. In case you use a pre-amplifier or an audio console try to locate a switch marked as "Phantom Power" and turn it on. Typically there is no problem supplying a phantom power at the SM58. In case you have no phantom power switch available, either post back the mixer brand / model to check it for you, or post me a question to suggest you one. Details about the usage and the mixer you are already using will help me to clarify the total audio situation.

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Jan 27, 2011 | Neumann TLM 103 Professional Microphone

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When plugged into the board, it just makes a rumbling noise, similar to the sound of wind against the mic. No other sound comes through.

First try another cable. If still bad, try another channel on the mixer. Obviously , you know this microphone requires phantom power.

If all fails, then the capsule o the microphone is shot. Either from being dropped, or excessive spit/moisture getting on the capsule.

Hope this helps.

Apr 13, 2010 | Neumann KMS105MT Professional Microphone

1 Answer

Picking up rf signal on my u87I

Wow that is annoying! Sounds like it's not properly shielded. Check out this site

Jul 23, 2009 | Neumann U87 Professional Microphone

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Your mixing board may not be supplying 48 volt phantom power, which is required by the U89. Check with a voltmeter from pin 2 of the XLR to pin 1, see that it's 48 +/- 4 volts.

Nov 25, 2008 | Neumann U 89 i Professional Microphone

3 Answers

Neumann U87 is distorting and cutting out

As condenser microphones 'mature' they may accumulate contaminants on their diaphragms, which in turn provide a relatively low impedance bypass for the bias voltage. To check if your microphone may suffer from this effect, hold it close to your mouth and breathe (heavily) a few times on the head. The moisture from your breath will condense , and if there the capsule is compromised by contaminants, or if it has developed other flaws, you will hear an increase in frying sound and/or complete loss of output.
Sometimes the capsule can be cleaned, thus extending its useful lifespan. At the risk of causing irreparable harm to the heart and soul of the microphone, this procedure should not be attempted by an inexperienced specialist! If in doubt, sens the microphone to the Neumann Service Department in Old Lyme, CT or another qualified specialist.

Uwe Sattler,
Technical Director - SEC

May 25, 2008 | Microphones

1 Answer

Neumann U87 no signal

Who serviced the mic? Send the mic to Tracy Korby or Klaus Heyne.

The capsule can get dirty and then behave in the way that you describe. It is possible that a simple cleaning by a professional will bring the mic up to spec.

Apr 06, 2008 | Neumann U87 Professional Microphone

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