Neumann M49 Clone : Build Thread Puck Style (TLM49 Conversion To M49 b-c)

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Hey guys, I just finished my build and I’ve got a ground buzz coming through. The microphone works, sounds great and doesn’t have any other noise, just a ground buzz. All of the grounding seems to check out and I have continuity throughout everything. I’ve searched through this thread to see if anyone has had a similar issue, but couldn’t find any posts. Does anyone have any ideas on what I should check? I also ran it through an isolation box to see if that would get rid of the buzz, but it did not. I’m kind of stumped. Also, once I kill the power to the PSU, and the capacitors are still charged, The buzz goes away in the mic sounds fantastic.
Put it in the body and try again.
 
Strange part about the noise is I have continuity everywhere I check. I can put a probe on the ground pin of the IEC and probe all way through the PSU up the mic and it all checks out.
 
Not sure what the noise is that you are referring to. What I heard in the video, was a capsule without any screening. It definitely shouldn't sound like that in its mic body.

Headbasket, body tube, and bottom bell all have continuity?
 
Not sure what the noise is that you are referring to. What I heard in the video, was a capsule without any screening. It definitely shouldn't sound like that in its mic body.

Headbasket, body tube, and bottom bell all have continuity?
Yes, I completely assembled the mic and checked continuity on all those places you mentioned, and there’s still a noise. That’s why I’m so perplexed. I actually bought enough to make a pair of these mics, so I assembled the other one, with PSU and I have the same noise. So I’m obviously doing something incorrectly in the build process. I just haven’t figured out what I’m doing incorrectly. By the way, thanks for taking some time to help with this.
 

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