Question about Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier

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I have a marshall mg 250 dfx, its making buzzing sound even im not flug in can somebody help me pls!!!

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It sounds like you need to bring it in to a repair shop. It could be loose contacts at the large filter caps. [one or both] This is common.

Posted on Dec 07, 2014

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NOT SURE WHAT FLUG MEANS? IF YOU MEAN PLUG. CALL GHOST BUSTERS.

Posted on Oct 25, 2010

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Marshall mg 50 dfx amp sounds muffled?


Turn off the effects or go inside and unplug the little sound card. It is only a few samples of real effects, not the real thing. It's like a cheap PC sound card separate from the other components and has a small power plug on it. Wiggle that plug or unplug to see if it changes. It won't cut her sound, just the effects. Make sure the effects are off and verify, if using a footswitch, that it is working properly.

Mar 21, 2014 | Music

2 Answers

Low volume on my marshall


I am very new here and don't know how to answer a question to a specific problem so I will write about the most common problems that I have had over the decades doing guitar amp repairs. If you find that your amp is extremely low in volume and then suddenly comes back to normal- check out the effects return [or power amp in] jack. Especially in Marshall amps-these corrode and your signal dies. If there is loud noise such as hissing and crackling with no guitar patch cord in the input jack- the input jack is likely at fault. They normally have switching contacts that ground part of the input circuit when the 1/4 inch male plug is disconnected. When this in is corroded or too weak to make normal contact, you can get these symptoms. If your amp is a solid state Marshall or Fender and there is a random buzzing sound with no guitar signal connected- hit the side of the amp and listen for the buzz to go away or become louder-if it does, this usually means that the connections are loose at the two large filter capacitors. In one or more Marshall amps, they use a filter circuit in the low voltage power supple for the preamp tubes. If you encounter a dead Marshall[the model escapes me now] remove the circuit board and resolder the four connections at the bottom of the bridge rectifier. If you have any other amplifier repair questions you can email me direct at computerlen@hotmail.com.

Nov 14, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

[23:05:39] Sharon Levit: hello! i have aproblem. iwll be glad if you can help me! so here is my problem: i bought a marshell 15 MG amp few days ago and this annoing buzzing problems. every time when i...


Make sure you are using this on a three wire grounded receptacle. If you are on an old two wirepower system, have a ground installed in the receptaclel you are using. If you are on a grounded circuit, then exercise your warranty for repair/replacement.

Aug 16, 2011 | Marshall Amplification Marshall MG15 15...

1 Answer

When turning my Marshal MG250 DFX on, there is a terrible buzzing sound. I have tried it on different speakers and the buzzing still occurs. It does not change in volume when i adjust the volume. Whats the...


This is likely a filter capacitor issue. The right tool to troubleshoot is an oscilloscope. This could also be a failed power amp that is driving high DC current with ripple into your speaker. This can permanently damage the speaker. Repair this before using it.

Jan 13, 2011 | Marshall Amplification Marshall MG250DFX...

1 Answer

My Marshall MG 50 DFX has a noisy fan. Can I take it apart and give a shot of oil?


Bo, the fans cannot be lubricated. If the noise is from bearings, replacement is the only option.

Dec 05, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

When you turn it on its making buzzy sound even im not flug in


One, You may Have a bad 1/4" jack on the Input, or Two you may have unballenced Bias on the Output Tubes. This is a technical adjustment in the Amplifier.

Oct 09, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

2 Answers

Marshall MG50 DFX, the volume knob OD channel crackles


Either the control is damaged (happens if they get hit) or it is possible the circuit board it is mounted on has broken solder OR worse, a crack near the control. The unit will require servicing. Parts are readily available.

Jan 28, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

4 Answers

I need the schematics for a Marshall MG30DFX guitar amplifier in order to repair it.


If you still want the schematics for the Marshall MG30DFX Steve I have them and can email them to you if you want

Dec 10, 2009 | Marshall Music

1 Answer

Hi,I turned on my Marshall mg series 100 dfx and there is no sound,just static comes on.Its starts with a kinda bad feedback sound than turns to loud static.


I suspect the power supply for the effects processor has failed. The effects unit will "go crazy" when power supply is too low voltage.

If the amp has loud noise, then the power amp portion is PROBABLY OK.

I had a similar problem in a Behringer amp caused by a bad electrolytic filter cap.

Aug 11, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

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