[BC] Humming Preamps

[Gary Glaenzer]

RF pick-up ?

Are there transmitters nearby ?


----- Original Message ----- 
From: "RadioPower Webmaster" <webmaster at radiopower.org>
To: <broadcast at radiolists.net>
Sent: Saturday, April 07, 2007 12:33 AM
Subject: [BC] Humming Preamps


> I'm still having issues with humming in all our mic, stereo, and
> phono preamps. 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 floors. 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 and replaced old
> vibrating breakers. It still hums. He suggests running 20 amp lines
> with isolated ground to plug strips for each booth. Before I lay down
> another $800 does this sound like it might fix our problem? Also do
> the high end $450 Furman or Monster power conditioners work any
> better than the $150 Furman PL-8 rack mount conditioners we have? I'm
> starting to fear thousands spent in a wild goose chase. By the way a
> Verizon tech had to install inline RF filters to cut the humming and
> noise from our phone hybrids. I've never met a building this noisy.
>
> Thanks in advance.
>
> Shelby
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