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Problem with a Sennheiser MKH30 - "like a growing bubble of static"

Subject: Problem with a Sennheiser MKH30 - "like a growing bubble of static"
From: "Laloux, Dominique" lalouxd
Date: Sun May 23, 2010 12:20 am ((PDT))
Hello everyone,
 
Can someone reassure me that this problem can be solved ?
 
I used one of my 2 Sennheiser MKH30 yesterday in a M/S setup with a MKH60, 
recording with my Fostex FR-2LE.
As soon as I pushed the standby button, I started to hear rather loud statics 
through the headphones.
 
Turned the recorder off, then on again, and the problem repeated itself. 
Several times. Turned the phantom power on/off, used a different set of XLR 
cables... nothing stopped the problem from occuring.  I tested both mics alone 
and the problem occured with the MKH30 only.
 
The way it happens can be better described as a growing bubble of static : the 
noise starts very low, then it grows louder and louder for a some time (20-30 
seconds or more) and becomes so loud that I need to turn the volume down to 
near 0. 
At some point, for no obvious reason, it then slowly "shrinks" back and 
disappears. 
 
I decided to try and record our garden soundscape anyway, and I ended up 
recording a full 2 hours with the problem repeating 3 times during the 2 hours. 
The strange thing is that everything was perfectly stable for the 2 hours, with 
no movement, no change in controls, etc.
 
What coud that be ? A defective condenser ?
 
Thanks.
 
DL
      









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