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Old 6th November 2019
  #3
Gear Maniac
 

Yes I would imagine this is electromagnetic noise getting picked up by any microphone that uses a magnetic transducer - hence picked up by dynamic and ribbons but not condensers...

Have you an electrical substation anywhetebnere you? Or there could be mains cabling with earth leakage on it which actually physically radiates in proximity...

Hope that helps!
Iain