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Marshall Mg30DFX guitar amp volume level cuts in and out! Anyone know how to fix this or what the problem is?

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I have just fixed one of the amplifiers with this fault. It was a poor solder joint on the headphone socket. The ground of the speaker is switched through the headphone socket, so if there isn't a good connection, the speaker volume drops, but the headphone output is still OK.

Posted on Feb 10, 2015

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Posted on Jan 02, 2017

  • 17 Answers

SOURCE: Marshall Amp Sound Problem

try cleaning the send and return sockets with switch cleaner or WD40

Posted on Feb 02, 2009

  • 161 Answers

SOURCE: amp or guitar??

I can say with a fair amount of certanty that this is the control knob on your guitar, these are fairly cheap and if you have any mechanical ability you can replace it yourself, there will be some soldering involved so if you can't do that I would take it to your local music store and most have some sort of repair department, this shouldn't be a big bill to get fixed.

Posted on Mar 19, 2009

  • 6 Answers

SOURCE: marshall vs232 makes a high pitched hum always

I saw this symptom last week on a similar amp. It was due to the reverb tank having come lose and being stuck magnetically to the back of the speaker causing wild feedback as you describe. Worth a look before getting out the soldering iron.

Posted on Jul 18, 2009

  • 5603 Answers

SOURCE: What is the fuse rating for a Marshall MG30dfx?

According to the schematic, the fuse for 120 volt is a 1 amp.

This is a reasonable size for this size amp.

Posted on May 14, 2010

  • 2 Answers

SOURCE: I need the schematics for a Marshall MG30DFX

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

Posted on May 16, 2010

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


Go here... https://elektrotanya.com/marshall_mg-30dfx_sch.pdf/download.html

Feb 25, 2017 | Marshall Music

1 Answer

I run a pod HD 500 into the amp and It breaks up, like there is a blown speaker sometimes.


The Marshall is a super clean acoustic amp.

The POD is overloading the amp.

Try the electric guitar input and keep the gain on the amp down, keep the EQ level and use the POD and the end volume to adjust the final volume.

The normal inputs is for a low output acoustic pickup - the POD is a high output electronic source.

Start with the Marshall gains low and get the clean sound good, then work on the gritty sound.

The amp is voiced for a sweet clean sound - if you want grit'n'ball change to a 50w Marshall valve head and a 4 X 12 cabinet.

Horses for courses

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Well i know ive destroyed a guitar amp with a bass guitar before :-p this is why they make bass amps and guitar amps instead of just amps

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Ive just purchased a marshall mg250dfx amp and when i play the volume cuts down low and then back up again like its fading in and out every so often


Since you just purchased this, verify that your guitar and cables are good on another amp and if they are good, then exercise your warranty on the Marshall.

Connectors and cables for guitars are chronic problems so verify they are good to avoid looking foolish.

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1 Answer

What is the fuse rating for a Marshall MG30dfx?


According to the schematic, the fuse for 120 volt is a 1 amp.

This is a reasonable size for this size amp.

May 13, 2010 | Marshall Music

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

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Marshall md hdfx100 vol. cut


a bad solder weld on a reverb pot can cut the volume.. you need to check the solder welds on all the pots and jacks. then move on to the grounding resistors, they look like sugar cubes, and are usually 300-500 ohm 3-5watt. those usually have cold solder welds and need to be resoldered. you can email me thru my website yostamplifier.com if you need further assistance. from there i will look into the schematics and help you fix your amp....via email.

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Popping noise


Your welcome. I'm glad I could help and if it came that way marshall should do it for you.

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Amp or guitar??


I can say with a fair amount of certanty that this is the control knob on your guitar, these are fairly cheap and if you have any mechanical ability you can replace it yourself, there will be some soldering involved so if you can't do that I would take it to your local music store and most have some sort of repair department, this shouldn't be a big bill to get fixed.

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Marshall Amp Sound Problem


try cleaning the send and return sockets with switch cleaner or WD40

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