tennbidder
New member
I have a problem with a Shure SM-81 microphone.
This mic was purchased used but is in mint condition.
There is a static hum when the mic is powered up. It sounds similar to what you would on a portable radio if placed to close to something like a flourescent light. The volume of the hum is loud enough to be detectable in headphones when preamp gain is set for recording.
I have isolated the hum to the mic by changing cords, changing preamps, and turning off any potential interference sources. Two cheaper mics hooked with exactly the same conditions have no hum.
Any ideas that would help eliminate the hum ? Do i have a defective mic?
This mic was purchased used but is in mint condition.
There is a static hum when the mic is powered up. It sounds similar to what you would on a portable radio if placed to close to something like a flourescent light. The volume of the hum is loud enough to be detectable in headphones when preamp gain is set for recording.
I have isolated the hum to the mic by changing cords, changing preamps, and turning off any potential interference sources. Two cheaper mics hooked with exactly the same conditions have no hum.
Any ideas that would help eliminate the hum ? Do i have a defective mic?