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Re: Details ...
Author: Kirk LaBelle
Date: 10/12/2012
Hi Martin,

Thank you very much for your rational scientific approach and patient exposition. I am very glad to hear that there is no routine “ageing characteristic” of capsules. This is good news to me, since I have just purchased a used U87ai that I expect to arrive next week.

I have, however, heard of a different phenomenon that could affect many capsules – not ageing or actual damage, but interference with the membrane’s ability to respond to air pressure fluctuations due to years of accumulation of film deposits and particles from singers’ saliva and airborne matter. These membranes aren’t broken – they’re just dirty.

You folks at Neumann must see thousands and thousands of microphones come to you for repair. You must have some of the best experience with this phenomenon on the planet. So my questions to you are focused on this.

1) Is this phenomenon real?
2) Is it common, after many years of use?
3) In your experience, with regular, conscientious studio use in a non-smoking environment, how long can a microphone go without maintenance and not exhibit any changes to its performance characteristics, due to this phenomenon?
4) How difficult is it to remedy and how would an owner best go about it?

Thanks,
Kirk  
 
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