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Re: KMS 105 Problem - coming soon
Author: Zoltan Pallot
Date: 09/13/2006
HI Guys,
I'm a performer in UK and bought my first kms-105 about three years ago. I am an electronics engineer by day and found several intermittent joints on the XLR connector PCB that gave rise to intermittent outages and loss of audio (plus squeak pops etc). After that it worked like a dream for about two years (was NEVER dropped) . About three months ago I was three songs into a two-hour gig and the mic cut out. I changed lead, changed input on desk which temporarily restored audio then failed again. I swapped mic out for SM58B and all was ok. Tried the mic out at work on test jig and couldn't fault it. I had it running with phantom power with an audio source into a storage scope triggered on level changes for 46 hours and saw no abnormality. I tapped the internal PCB, tapped the capsule, moved the wires etc absolutely nothing, rock solid performance. I figured it couldn't be the mic and i must have missed something. Next gig I tried the KMS in soundcheck, perfect, no problem. However, when we started the gig, after singing into it for about 2 minutes, the same problem returned, audio disappears and whooshes and squeals can be heard (positively identified coming from KMS). I've tried different mixers, leads, everything. My KMS has a strange intermittent fault that is NOT bad solder joints. I think it may be moisture getting into the capsule since it only fails when I'M SCREAMING INTO IT! I like the sound of it so much I have purchased another (and convinced our guitarist to buy one for BVocals!). I hope I don't live to regret it. At 400 this is not a cheap mic. I would like to have my old kms repaired, or at least the fault diagnosed. Where is this possible, and is it really economic? If you could sell me a capsule at a reasonable rate, I could easily fit it myself. if this is a pattern of failure maybe I can mitigate it, say by using a pop-filter over the screen or something. I am also disappointed that Neumann don't sell replacement mesh screens for the KMS as these things do get rusty.
If my second mic fails I will have to say I give up.

Living in hope. Zoltan (Jersey).  
 
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