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Replacing KM84 badge question Condenser Microphones
Old 8th November 2018
  #1
Gear Head
Replacing KM84 badge question

Hey Neumann experts.

Didn't see this in the threads.
I just received a replacement badge for my old Km 84.
Going to install it but noticed what sounds like something loose inside.
Mic still works perfectly.

Before I open it I do recall reading something about not removing the KM84's capsule as it was calibrated in some way and opening it may mess things up.

So wanting to be wise, I'm asking.
Any issue opening it up?

Also, could the rattle be a clip that used to hold the badge on?
it looks like there may be something inside the holes.

Appreciate any info.

Cheers
Old 8th November 2018
  #2
Gear Guru
 
kafka's Avatar
Quote:
Originally Posted by Indian Hills View Post
Hey Neumann experts.

Didn't see this in the threads.
I just received a replacement badge for my old Km 84.
Going to install it but noticed what sounds like something loose inside.
Mic still works perfectly.

Before I open it I do recall reading something about not removing the KM84's capsule as it was calibrated in some way and opening it may mess things up.

So wanting to be wise, I'm asking.
Any issue opening it up?

Also, could the rattle be a clip that used to hold the badge on?
it looks like there may be something inside the holes.

Appreciate any info.

Cheers
OK, I'm not Klaus Heyne, but that would be pretty silly given that it's a modular mic.

If you're afraid, send it to Tom Onofrio. Actually, probably a good idea for any old KM84 whether you're afraid or not.
Old 8th November 2018
  #3
Gear Head
Upon a closer look, the XL connector is a bit loose causing the rattle.
Thanks for the suggestion.
Old 8th November 2018
  #4
Gear Guru
 
John Willett's Avatar
 

Quote:
Originally Posted by Indian Hills View Post
Upon a closer look, the XL connector is a bit loose causing the rattle.
This is normal and part of the design - it won't rattle when the cable is plugged in.
Old 8th November 2018
  #5
Lives for gear
 
Klaus's Avatar
 

If it was the loose connector that rattled, hold it tight while you shake the mic. If the rattling is still there, it will be revealed once you open the mic.
(Willett is correct: you need movement of the connector to properly line up with the female cable connector. If it were fixed, any slight miss-alignment of the two connectors would scrape down the silver plating of the mating surfaces.)

With a 1.4mm screw driver, turn in (clockwise) the three housing screws no more than they barely clear the housing tube, about 1.5 turns. If you go too far, you will lose the screws into the bowels of the mic.

As you move the housing tube upwards, put slight pressure on the -10dB stalk, so it clears the slot in the housing. Remove the tube off the frame (the capsule head, attached to the tube stays with it, so you don't have to worry about messing up the capsule's working parts).

Remove the purple (very old KM's: clear) plastic sleeve from the mic amp. Observe how the -10dB stalk was positioned before you do.

Investigate the cause of the rattle. The badge is press-fit. Its mount-two rivets-cannot rattle.

While you are here: tighten the XLR screw at the bottom- it's a big 2.5mm slot screw. It sometimes gets loose.


Here is my detailed description how to mount badges on Neumann mics:
How to (Re-)Mount Badges on Microphone Bodies

Best of luck!
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