[Milsurplus] Getting rid of moisture in carbon microphones and other components

[Jim Whartenby]

One easy way to get rid of moisture is using a vacuum.  One can easily convert an old pressure cooker into a vacuum chamber.  I did just this about 10 years ago for about $25 - $30.  Just need a new gasket, vacuum gauge, ball valve and a few 1/4 inch brass fittings.  The holes are already there so no machining was needed.  Lowes carried most of what I used along with eBay.  I already had the compressor / vacuum pump from a small air brush sprayer.Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Friday, May 30, 2025 at 12:46:22 PM CDT, Brenda Gentry via Milsurplus <milsurplus at mailman.qth.net> wrote:   

  
ATTACHED is the method recommended by Western Electric to rejuvenate carbon microphones.
 
  B.Gentry, KA2IVY
 
 On 5/30/25 1:22 PM, Rich MC Clung via Milsurplus wrote:
  
 
 Check the microphone element. Most of that older equipment had carbon composition microphones. The carbon sometimes becomes compacted. We used to take the microphone element and tap it a few time on the bench top and check it a few times to see if it was working any better. 
  RICH  WA6KNW 
   
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