[BC] Re: Humming Preamps

[Xmitters@aol.com]

In a message dated 4/7/07 12:13:42 PM Central Daylight Time, 
broadcast-request at radiolists.net writes:

<< I'm still having issues with humming in all our mic, stereo, and    phono pr
eamps. It's a buzzing sound that seems faster higher    frequency than 60 cycle
 hum. More like RF static. It happens in all 4    of our studio booths on two f
loors. It's so bad we can't use our    turntables. I got an electrician to come
 out and he ran new ground    wires for the building service and switch panel a
nd replaced old    vibrating breakers. It still hums.  >>

Shelby:

How far are you from the nearest full facility VHF or UHF TV transmitter 
site? What you are describing sounds like a problem I had once in a downtown 
Chicago production studio. We had a mic pre that was picking up video from one 
of 
the superpower UHF TV stations at the Sears Tower. Any chance the RF is coming 
from a nearby TV station? If so, that will obviously change the strategy for 
eliminating the problem. 


Jeff Glass
Northern Illinois University

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