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[pruner1]

Hi All.  New to the forum.  Found it while investigating my U47 problem.

I have wind, rumble, and pops randomly.  Sometimes it's not there at all and the mic is very quiet.  It comes and goes without warning.

U47 has the rca nuvistor.  Capsule was replaced 15 years ago. Custom power supply was built when the mic was rebuilt.

If this were the capsule, wouldn't it make the sound constantly?
When it's not there, the mic is fine and sounds great.

Here is a link to the noise.
http://www.cattraxrecording.com/U47_noise.mp3

Any opinions would be appreciated.  Just trying to diagnose it so I can figure out how much the repair will be.  Also who should I send it to to be fixed?  I live in upstate New York.

Thanks,
Josh