Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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I have a 65 watt marshall valvestate, it makes this random loud clug!clug! sound...what could cause this??

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Posted on Jan 02, 2017

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SOURCE: my marshall valvestate 100w combo makes a high

One of the tubes COULD be microphonic.

Take back off and use a pencil to lightly tap each tube to see if one causes noise.

Posted on Sep 10, 2009

  • 5 Answers

SOURCE: 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

As an electronics tech for 40 years I have spent half of those years reparing the damage done to electronic equipment by WD40. It is a great product when used in the correct situation. When it comes to cleaning controls in amplifiers etc the correct procedure is to apply a contact cleaner to flush out any dirt then apply a contact lubricant. WD40 contains minute graphite particles as well as corrosive chemicals. Between the two they swiftly render the controls to the bin.
WD40 great for unlocking rusty screws etc but never use it in electronic gear.

Posted on Jun 01, 2010

  • 17 Answers

SOURCE: its a marshal 8080 valvestate 80 v and it buzzes

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.

Posted on Mar 05, 2011

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First check the preamp valve in that curcuit

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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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Hi my Marshal G15 is making an echoy twang when played loud (& open E chords). does this mean the reverb is broken?


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Test this bylistening with headphones and see if you get same sound.

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My marshall valvestate 100 will completly cut out when im playing and the only way to make it come back is to turn it off and then on. it makes a really loud pop when i have 2 preform this task


It sounds like one of the filter capacitors is getting ready to fail in the power supply. Here is a link to some good info:http://www.geofex.com/ampdbug/ampdebug.htm Here is the schematic:http://www.ampix.org/displayimage.php?album=31&pos=112 Let me know if this helps.

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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.

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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.

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If you strike a low note too loud you risk damaging the speaker itself. The low note will cause hte speaker to extrude too far when loud and can either pop out completely or wear through the voice coil and short out the amp.

In short, don't do it.

Dan

Mar 06, 2009 | Marshall 15 Watt Guitar Amp

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