Help! Bad Tube Mic hum

ron florentine · 12th August 2005

I just purchased a very nice U47 flavored mic and I am getting a noticable hum at about 200 hz....loud enough to make it unusable........i had the mic tech look at it and everything sounded fine in his studio....when I plug it back in back in my studio the hum is still there big time.........I have tried ungrounding the plug......Moving the mic out of my home studio.......tried different outlets.......have shut off all appliances throughout the house and I am still getting the hum............All my other mics do not hum only this one...........Is it possible I have dirty power running throughtout the house and studio.......I do have the basic Furman voltage regulators and power condtioners throuout my studio ..........Is there anything I could buy that would possibly clean up my power.....something that I could plug into one of my wall sockets and the plug the Tube mic into that. device.....I love the sound of this mic but this hum is unaceptable......ANY HELP IS GREATLY APPRECATED !!!!

Thanks

tINY · 12th August 2005

Are you using +48v phantom power?

200Hz is not typical of AC noise in the states.

-tINY

Mrs. Fairman · 12th August 2005

Quote:

Originally Posted by ron florentine

I just purchased a very nice U47 flavored mic and I am getting a noticable hum at about 200 hz....loud enough to make it unusable........i had the mic tech look at it and everything sounded fine in his studio....when I plug it back in back in my studio the hum is still there big time.........I have tried ungrounding the plug......Moving the mic out of my home studio.......tried different outlets.......have shut off all appliances throughout the house and I am still getting the hum............All my other mics do not hum only this one...........Is it possible I have dirty power running throughtout the house and studio.......I do have the basic Furman voltage regulators and power condtioners throuout my studio ..........Is there anything I could buy that would possibly clean up my power.....something that I could plug into one of my wall sockets and the plug the Tube mic into that. device.....I love the sound of this mic but this hum is unaceptable......ANY HELP IS GREATLY APPRECATED !!!!

Thanks

Send please a picture with Hz of measurement. 200 Hz not possible.
50/60 or many, many lower... the harmonic waves 100/120 cycles per second.

Send please a picture of microphone.
Ein picture of the opened PSU and microphone.

... PSU.. Elko defectively?

ron florentine · 12th August 2005

It might not be 200 hz....it is a low hum....possibly I am hearing the harmonics on top of the main fundamantal buzz......I matched it between B flat and B natual on my guitar........I am not a tech guy so be easy on me.........I just needed some info on something I could purchase or try before i return the mic that would elimanate the hum promblem.Thank You!

Marty Shields. · 15th August 2005

If you have annother mike that uses the remote power from your pre or desk, see if that hums, if it does the phantom power from your supply is dirty, and you may need a new cap or 2, if this isn't the case, try changing the lead on the noisy mic and see if that works, Marty.

12th August 2005	#1
ron florentine Lives for gear Join Date: Aug 2003 Location: San Diego,Ca Posts: 806 Thread Starter	Help! Bad Tube Mic hum I just purchased a very nice U47 flavored mic and I am getting a noticable hum at about 200 hz....loud enough to make it unusable........i had the mic tech look at it and everything sounded fine in his studio....when I plug it back in back in my studio the hum is still there big time.........I have tried ungrounding the plug......Moving the mic out of my home studio.......tried different outlets.......have shut off all appliances throughout the house and I am still getting the hum............All my other mics do not hum only this one...........Is it possible I have dirty power running throughtout the house and studio.......I do have the basic Furman voltage regulators and power condtioners throuout my studio ..........Is there anything I could buy that would possibly clean up my power.....something that I could plug into one of my wall sockets and the plug the Tube mic into that. device.....I love the sound of this mic but this hum is unaceptable......ANY HELP IS GREATLY APPRECATED !!!! Thanks

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12th August 2005	#2
tINY Gear Guru Join Date: Jul 2004 Location: Orygun Posts: 10,206	Are you using +48v phantom power? 200Hz is not typical of AC noise in the states. -tINY

15th August 2005	#5
Marty Shields. Gear Head Join Date: Jan 2004 Location: Tasmania, Aus't Posts: 66	If you have annother mike that uses the remote power from your pre or desk, see if that hums, if it does the phantom power from your supply is dirty, and you may need a new cap or 2, if this isn't the case, try changing the lead on the noisy mic and see if that works, Marty.