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TLM193 hum hum hum... Condenser Microphones
Old 15th December 2010
TLM193 hum hum hum...

'I've got a TLM 193 that has developed a hum that I'm guessing is a grounding problem; when I touch the grille, the hum increases dramatically.


**** *****'

I found this one over PSW forum... A funny thing is that I have the exact same problem.

Should I try Gotham GAC-3 to have separate shield?


Old 15th December 2010
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Radardoug's Avatar

Check the screw on the XLR insert and make sure it is tight.
Also can be caused by high rf fields. Are you near a transmitter site?
Old 16th December 2010
Originally Posted by Radardoug View Post
Check the screw on the XLR insert and make sure it is tight.
Also can be caused by high rf fields. Are you near a transmitter site?
Hi, Ragardoug.

will check out the screw. I am not sure if there is a transmitter. As usual, all other mics are fine except the TLM 193.


Old 20th December 2010
problem solved!!!

This cured the problem!!!


the TLM193 opens up from the top, not from the bottom, like U87.
Before thinking about RF, please indeed the grounding aspect, as you're certainly talking about standard mains hum (50Hz EU, 60 Hz US).
The TLM193 housing is grounded via the XLR screw, so if you loosen that screw, the TLM193 *has* to produce hum, like any unshielded electronic circuit. Retighten that screw really solidly, making sure that there is the washer ("scratching disc" style) below the screw head. Additionally you might scratch off, with a sharp pointed tool, any remaining lacquer there is at the bottom of the screw hole, to assure proper ground connection.
If you should have dismantled the head grille as well, you might free the 3 conical holes at the side of the head grille as well, of any lacquer inside the conical drilling, and retighten the screws firmly.

Best regards,
Martin Schneider / Neumann Mic. Development
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