Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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Hi, i have a marshall valvestate 10 stack, my problem is that when i plug in it makes no sound but when the jack isnt in my guitar it does make a sound like any other amp when you knock the end of the lead? please help. :(

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  • razzathemazz Aug 07, 2010

    my les paul is in full working order, only a few months old.

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You might want to have a music shop test the guitars mechanics for any issues.

Posted on Aug 07, 2010

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1 Answer

Marshall mg15fx. no sound coming. the only sound i get is buzz when switching the master knob.


I would test by first trying a different guitar cord. If the fault is still there, try jumpering the effects in and out jacks with a patch cord. If there is sound now, clean the two jacks with contact spray and working a 1/4 inch plug in and out of the two jacks.

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First check the preamp valve in that curcuit

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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

Every time i turn on their is a loud high pitch squeel that occurs on my Marshall VS232 amp. My volume is all the way down, and the gain channel isnt on either. What is the problem?


If this happens when guitar cable is disconnected, take unit in for repair. This should be easy to troubleshoot. Hint: demonstrate the problem in the shop. Things have a way of fixing themselves and then lots of time is wasted trying to recreate the problem.

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I got a Marshall MG100HFX Amplifier for guitar. The problem is that whenever i turn treble switch on it gives clean sound as it should, but in couple seconds it fades away. When I turn the switch again it...


I haven't played or worked on a MG100HFX but I understand amp circuits very well. The behavior you are describing sounds to me like a bad capacitor in the Treble circuit. This is a problem that would require the skills of an experienced amp tech. If you are within your warranty period you might want to return it. If not, a good local repair shop should be able to diagnose the problem.

Good luck and keep rockin'!

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Its a marshal 8080 valvestate 80 v and it buzzes and some of the knobs crackle when turned,


Buzzing could be normal for this amp, especially if you have the gain cranked way up (or the volume way up) see if the buzz goes away when you turn the gain/volume down. If not, there is a problem that needs to be properly diagnosed by the amp tech at your local music store. The crackling is also unfortunately rather normal for an amp that's a little older. Oxidation builds up inside the knobs and makes that noise as you turn them. If it only happens when you change settings I wouldn't worry about it, but if it gets bad, a tech guy can clean it out for you.

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1 Answer

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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Hi, I have a Marshall 8240. The Reverb output


probably the reverb tank These coils are very thin and tent to break easily

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Marshall mg100hdfx loud fuzz and distortion and no guitar sound


Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.

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4 Answers

Marshall valvestate 8080 1. when i turn the buttons they make a cracking sound 2.when i play on it the sound becomes very quiet


When turning the knobs you might get a crackling noise if the amp is old, The knobs get worn. Either you can replace them or repair them with a tiny squirt of WD40. Check youtube videos for help.

As for the fading sound, That would be your valves ... They need to be replaced ... I suggest taking it to a repair dhop for that because they need to be matched.

May 22, 2009 | Marshall Music

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