Troubleshooting Steady State 100hz hum in microphone.

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SparkleBear

Well-known member
GDIY Supporter
Joined
Jun 21, 2016
Messages
308
Location
Santa Cruz, CA
Hey all,

I have a MK67 here converted from a tlm67 to u67 from Max. I built my own power supply for it from dany's d67 kit.
I have a steady state 100hz hum in the signal. I swapped out the capsule and head basket, I swapped the tubes, i swapped the output cap... none of which solved the issue. It doesn't seem to be an issue of shielding either... i also checked on different xlr cables, different mic preamps and different converter inputs...

Any tips in tracking this down? Possibly something in the PSU? Mic Transformer?

Any help would be gratefully appreciated.

CHEERS! :)
 
HarmonyUnited said:
Hey all,

I have a MK67 here converted from a tlm67 to u67 from Max. I built my own power supply for it from dany's d67 kit.
I have a steady state 100hz hum in the signal. I swapped out the capsule and head basket, I swapped the tubes, i swapped the output cap... none of which solved the issue. It doesn't seem to be an issue of shielding either... i also checked on different xlr cables, different mic preamps and different converter inputs...

Any tips in tracking this down? Possibly something in the PSU? Mic Transformer?

Any help would be gratefully appreciated.

CHEERS! :)

Hello

I want to say check PSU and rectifier, but your location make me doubt...  60Hz country ...

Best
Zam
 

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