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Anyone experiencing 60hz hum from fluorescent tubes or CFL bulbs?

channel70productions's picture
Last seen: 1 year 6 months ago
Joined: 11/08/2011 - 9:17pm

When too close to some of our wired mics, we sometimes experience hum in the audio track from these lights. While troubleshooting, we discovered replacing individual bulbs or tubes fixed the problem. Is this just our personal gremlin at work or are others having problems, too?



chuckzootz's picture
Last seen: 10 months 4 days ago
Joined: 02/07/2012 - 7:16pm

Been using them for a couple of years and haven't experienced the problem either


Rick Crampton's picture
Last seen: 2 months 1 week ago
Joined: 08/20/2009 - 1:08pm

" When too close to some of our wired mics, we sometimes experience hum in the audio track from these lights "

What type of wired mics? Dynamic, ribbon, and some condenser mics have coils or transformers in em into which hum can be induced by any device which also has a transformer or coil, running on 60Hz ( or 50Hz ) power. If the mic is not picking up the induced field, the mic cable can in some cases if it is not a truely balanced circuit. The trend away from input transformers in micpreamps ( too expensive and heavy) toward electronic, differential inputs can also be susceptable to induced hum unless it involves some sophisticated circuitry ( not found in low-cost micpreamps ). I think it's safe to say that just because a camera may have an XLR mic input, it is no guarantee the the mic preamp is a high quality, well-balanced input stage.

Rick Crampton