Question about Marshall Amplification Marshall MG50FX 50 Watt Combo Guitar Amplifier with FX and MP3 Input

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I have an MG50FX amplifier that is less than half a year old and in the middle of playing the distortion will fade to the point of disappearing and will then suddenly come back in the middle of a note. What could be causing this?

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If you are any kind of ab electronic bug you may be able to fix this. First of all if you can remove the main board out of this TV, do do. I must remind you, this will require patience and care. You better know exactly which wires you disconnect etc. With board at hand you will have to very, very critically inspect the board for bad grounds and resoder as necessary. The next thing to do is to check all capacitors with an ESR meter and replace the capacitors as you find. I would guess you have one bad capacitor. Ninety nine percent of the time resoldering grounds and replacing a cap will cure your problem. Thanks for asking and show all hands of support!

Posted on Apr 04, 2011

  • matt martin
    matt martin Apr 05, 2011

    HMMMM...just thinking for an easier repair. Be sure you have good grounds on the speaker. (two wires connected to speaker should be tight) Are you sure you have a good guitar cord with good solid grounds? (cord should not have a crackle or pop when pulled or tugged). The tuning knobs and humbucker of the guitar have good solid connections? You may use a tuner spray purchased at an electronic store, to clean the potentiometers on the guitar and the tuning knobs of the amp as well. The connections that receive the cord on the guitar and the amp should also be tight. Try these before you take your amp apart. Just thought I would find a simpler repair first. Another major repair, would be to replace the speaker. A blown speaker can do what you describe. I play the guitar, and find that distortion will over ride the speaker and can cause damage.Thanks for listening.

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I had this Amp for almost 4 years now, and suddenly got a problem a month ago. When I'm using it from clean sound it suddenly auto switch to distortion sound and vice - versa .


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I have an MG50FX amplifier that is less than half a year old and in the middle of playing the distortion will fade to the point of disappearing and will then suddenly come back in the middle of a note. ...


Many things can cause this... A COMMON problem is broken solder joints near potentiometer where they attach to the circuit board. Look for bad solder joints and also cracks in the circuit board.

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