gefell/neumann cmv 563 signal drop, help?

hey folks. i have an issue with my gefell/neumann cmv 563 with an m7 capsule. i am  in the middle of a recording session right now, and from time to time it starts to drop the signal and the sound gets quite flat and harsh. switching it on off (power supply) mostly solves the issue. sometimes it runs good for hours.

is that a common issue? is that due to the power supply? does that might need new caps? or more likely to happen to the tube? anyone a straight away idea just to get through the session this week?

Capsule collapsing? Anyone breathing on it? Always use windscreen...

Jakob E.

i always use a windscreen, but is it actually possible for the capsule to collapse like this due to to much signal?

No, not because of loud signal - but because of too high humidity...

Jakob E.

About 7 years ago I had this same problem with one of my CMV563's. It turned out to be the power supply. The mic worked perfect with the other PS. I can't remember what the fix was but it may have been a resistor that was replaced.

hitchhiker said:

About 7 years ago I had this same problem with one of my CMV563's. It turned out to be the power supply. The mic worked perfect with the other PS. I can't remember what the fix was but it may have been a resistor that was replaced.

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the 1 Meg resistor.

why the 1meg one? 

yeah i had a problem with losing level and also changed a resistor to solve it, cant remember what size it was though...

inputhone said:

why the 1meg one? 

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because years ago , a german microphone authority advised me to do so , and my microphone came back to life.