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Buzzing noise on Marshall MG100FX

Immediately upon powering on and with or without an instrument connected, Marshall MG100FX makes constant, buzzing noise. Previously worked fine before friend turned off connected instrument and then turned off amp. Nothing has changed in setup of amp or power connections, etc. Master dial use makes sound louder. Connecting a guitar results in very faded guitar sound behind constant buzzing sound.

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Posted on Jan 02, 2017

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SOURCE: loud buzzing when amp connects to guitar

The buzzing noise could be caused by a grould feedback loop. This occures when the amp is plugged into one power socket and the guitar's amp is plugged into a drifferent power socket.
Try to use a power board, plug in all your devices into this power board and plug the power board into a power socket.

Posted on Jan 03, 2009

  • 1137 Answers

SOURCE: Constant buzzing in my 15 W amplifier

Make sure you have a ground prong on your power cord. Most input jacks nowadays are closed circuit. They have a switch built in that won't allow any sound without the cord plugged in. You may have a damaged jack that will give you a loud hiss, a loud hum or crackling depending on what volume your controls are set at.

Posted on Aug 28, 2009

  • 5568 Answers

SOURCE: it constantly has a buzzing

Start by unplugging anything attached to the amp to eliminate simple things such as a broken shield on an input cable.
If you still have the pronounced hum with nothing connected, then the amp's power supply may have a failed filter capacitor or diode bridge. Either of those would have to be sought by a tech with the right gear.

Posted on Jul 04, 2011

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Posted on Aug 16, 2011

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Constant buzzing in my 15 W amplifier

Make sure you have a ground prong on your power cord. Most input jacks nowadays are closed circuit. They have a switch built in that won't allow any sound without the cord plugged in. You may have a damaged jack that will give you a loud hiss, a loud hum or crackling depending on what volume your controls are set at.

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