Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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Ihave a marshell dfx 100 guitar amp...as i play it the volume lowers and will eventully fade to nothing... any ideas..

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Yes the level of the headphones also fades in mine! mine is a MG 50 FX

Posted on Sep 07, 2012

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For a test in troubleshooting, see if level from the headphone jack fades or not when this happens and get back to us.

Posted on Sep 02, 2010

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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.

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FM 65R plays and sounds great for about 5- 10 minutes then it sounds weak and distorted. If I play directly into the power amp input it sounds great again just no control for the volume and tone.


Also the volume will probably be lower going into the line level PA input... If the amp is shutting down for thermal reasons, driving it less might not get to the point of shutdown. The schematic shows a temp sensor that reduces and shuts down the amp if the heatsinks get to hot. Possibly you are driving the amp harder than it is intended, If it is as loud (I doubt it) driving the PA input, then I would expect it to shutdown, but you would probably have to drive it harder than your guitar because guitar levels are well below line level. The amp claims 65 watts... don't believe everything you read in spec sheets... You should be able to generate 100 Db of sound with it... The more distortion you use will drive the amp harder and heat the heatsinks faster.

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Hi There, i have a Marshall MG100 DFX Series Guitar Combo Amp,and when i plug my guitar in i get verry little,or no sound from the guitar imput,can you please help. Thank you.


Try exceriszing the connections for input and headphone jacks ( just be inserting qtr inch connector in/out of jack ) a few times. then plug back into your input. if that didn't solve anything while amp is on move the input jack around ( up, down, left, right, ) and see if this makes the signal cut in/out to normal playing. if so you just have broken solder connections on the jack. Also you may just want to test your Speaker to make sure no problems exise there. ( Voltmeter across + and - terminals ) prolly 8 ohms but will most likely state on woofer. if not of this fixes your problem let me know and i'll throw some more steps your way.

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My marshall mg50 dfx keeps cutting out and stuttering, any idea what the problem is? It sort of cackles as well when the volumes increased giving me different variations in sound.


As a guitar player myself learn that not all speaker from some amps hold the ouput wattage. The fuse could ba a problem or the speaker is giving out.

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I have Fender Hot Rod Deluxe and Blues Deluxe amps.After the amps are in use for 20-30 minutes, volume just flat out fades to almost nothing. I have had it checked out and technician could not reproduce...


I want you to do a test. while using the amp plug a pair of headphones into the preamp out... note you will only hear stuff on one side if they are stereo phones and the sound may be fairly weak... while the unit is operating correctely then unplug phones and use it. When it fades out plug in phones compare the level when it was OK... If the preamp output fades lower as well, then we know problem is in the preamp section...

We can do a lot of troubleshooting without opening the amp.

I see nothing in the scheamtics that should be an issue causing this...

Since it didn't fail for the tech, think "what was different?". Are you connecting something else? Foot pedal? Temperature? :Loudness of playing?

Now what else is in common to these two units... AHA! The guitar...

If your guitar has a battery in it, the 20 to 30 minutes fading would correspond to a battery failing and then recovering after you unplug the guitar for a while.

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Marshall DSL 100 - volume fades away and gradually comes back on


IF this is a vacuum tube unit, these symptoms are that of a tube that the heater is intermittent, that is it cools off due to a break and then liights again.

Open the back and observe the heaters in the tubes. DO NOT be fooled by some that have TWO heaters in them. (use a mirror if necessary) A single one that comes and goes can cause the problem and the voiration can make it come and go. This behavior in a tube is NOT somthing readily spotted in a tube checker. The delay in fading and coming back would be the delay in warm up following a heater going out and cooling.

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Handmade guitar amp, when i plugin the guitar i start playing, but then signal gets lost, the sound dissapears, and then it appears again, and after minute or two it dissapears. i've tried to put full...


have you got valves fitted to the amp as they can cause fading if old >damaged >not fittted properly also check the speaker connects and try playing half volume the output should be steady.. you say its handmade if you made it pull out the amp board and check your soldering joints look to see fi there is any that need resoldering as they may be getting hot and causing a resistor to fade..

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