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Buzz from lexicon lx-7 power amp

Hi i have a problem wit my lexicon power amp, a buzzing/hum coming from all the channels. Its only very faint when its just the power amp on and nothing is connected to it but the speakers. buzz gets louder when i connect the pre amp to the RCA inputs on the power amp. it get even louder when i switch the plasma on. which is connected to the pre amp with a component lead, if i disconnect the component the buzz is reduced. Is there a fualt with the power amp as i'v treid loads of ways to get rid of the buzz.

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Might be caused by any of the Large Capacitors in the power supply section of the amp.

Posted on Feb 16, 2009


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Can't route effects to two channels of my mixer. If I plug into input 1 of my power amp, I have effects. If i plug into input 2 of my power amp, I get no effects. I tried both Crown and QSC power amps. ...

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Its a routing problem - some mixers only allow certain routing and this could be affecting your FX routes.
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Hi chupetin2

If the problem is present with ONLY the speakers connected, that is no other powered devices like subs, or input/output cables, it will be a power supply problem inside the amp. If you have electronic fault finding skills, there will probably be a capacitor in a regulated rail that has failed.
If you do have a sub connected, be sure it is powered from the same mains source as the amp, or at least a GPO that is on the same phase. Different phases will induce mains hum, as will multiple earths. Try also temporarily moving the amp(whilst monitoring the hum) from where it is sitting and see if the hum is being induced into the amp by any other devices

Happy to talk to you more about this. Just ask:)


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