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AKG solidtube noise problem new
      #50799 - 16/11/04 09:39 PM
G'day mates!

I resently aquired a used AKG solidtube condenser mic, and it seems to exhibit a noise problem (a buzzing sound with a fundamental around 50-60 hz)

The noise gets worse if I move my hand close to the grill, and gets a little bit better if I touch the metal endpiece of the XLR cable connected to the mic.

The "ground lift" switch on the microphone's power supply box has no effect on the noise. Other condensers like my Rode NT1 works perfectly with the same constellation of gear connected in the same way (audio AND power leads)

I don't have ground in my studio mains supply.

Does anybody have any suggestions as to what may be the problem here, and as to what I can do to ammend it?

Thanks in advance!
Sondre, Norwegian reader

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Hugh RobjohnsAdministrator
SOS Technical Editor

Joined: 25/07/03
Posts: 22647
Loc: Worcestershire
Re: AKG solidtube noise problem [Re: sandor]
      #50815 - 16/11/04 10:18 PM
I think the installation of a decent ground would be my first priority. That may well cure your hum problem, and it will certainly preserve your life!

It is also possible that the valve in the mic is on its last legs and may need to be changed, or that one or more of the power supply smoothing capacitors is failing.

But I'd get a competent electrician to install a decent earthing system first.


Technical Editor, Sound On Sound

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