Oktava 319 with hum issue.

[RichardP]

Hi,

I have a Joly modded Oktava 319 - but have unfortunately dropped it. It now hums at 50 hz. It would seem that I now have a grounding connection issue.
I have noticed that if I touch the base of the microphone with one hand and the top of the basket with the other the hum disappears.
However, if I touch the base of the microphone with one hand and the side of the basket with the other, it makes no difference to the hum.
Would this suggest a connection issue between the top and the side? Certainly, the original epoxy has worn down a little (the mod is nearly 16 years old).
Could there be anything else that might explain the hum ( the screw in the centre of the diaphragm is stable)?

Much appreciated

RichardP

 

[pasarski]

Definitely sounds like you diagnose is correct

Edit: Would expect more like a buzz than hum though. But the fact that grounding the head basket with your hand makes the noise go away nevertheless implies it's a grounding issue.