Is the Marantz powered with a two prong AC to DC power supply, or is it also 
grounded? It might be worth trying to ground the Marantz recorder housing to 
house ground. I had a similar problem with a home stereo system and the 21c 
OldBird flowerpot mic. Grounded the stereo to house ground and the 60Hz noise 
vanished. Just a thought and worth a try...

Good luck!!

Chris T-H

Sent from my iPhone

On Sep 19, 2018, at 19:14, Wim van Dam 
<<>> wrote:

[I'm not sure if this newsgroup is still alive, but here goes.]

This week I finally installed my OldBird 21c microphone and I'm having some 
noise issues. In my setting I use a Marantz solid state recorder for my 
recordings. When I power this recorder with its standard AA batteries, things 
are fine but it does not allow me to record for more than a few hours. When I 
use AC power for the recorder instead, a lot of noise shows up at 1500Hz, 
1620Hz, 1740Hz, 1860Hz, etc. Likely this has to do with the fact that the 
recorder and the OB21c microphone use the same AC outlet.

What is the best solution to this problem?

Wim van Dam
Solvang, CA, USA
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