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Hi there, My 50 watt MG series marshall amp keeps making a loud rattling sound when its turned up loud. Any ideas why this is and how i could fix it? Ashley Fields e-mail: ashley_ibanez@yahoo.co.uk

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You need to determine whether the amp is creating the sound or the speaker itself has a problem. based upon your description, I think that the speaker is blown. The voice coil probably has come loose from its form. Try using the speaker out jack to connect the amp to another speaker. If that sounds good, the problem is the speaker itself.

Dan

Posted on Sep 12, 2008

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Bring spray contact cleaner from radio shack near you and clean volume control for amp while you are moving it forward and backward---do not put your mic in front of your speakers because this will give you more trouble.

Posted on Sep 12, 2008

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I have fixed so many of these amps over the years... Marshall Valvestate series of amps are notorious for dry solder joints developing on the main PCB. If you have the skills(or an old mate that does)Remove the PCB from the chassis and resolder any suspect dry joints and you will fix the problem. Check particularly about any components there the PB has changed colour. This is an indication of heat in that area, and heating and cooling is a major cause dry joints.
I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

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