Question about Marshall Mg15dfx 15-Watt Combo Guitar Amplifier

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Mg15dfx Amp issue

After playing guitar for 3 to 4 min, my amp starts rushing (like if someone was hammering rapidly on a microphone). I tried several things to locate the issue and nothing came up. I am pretty sure this is nnot a connectivity issue. The best would be to have the schematic for my Mg15dfx...

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  • Marshall Master
  • 5,603 Answers

Most of these use an amplifier chip in the TDA family of 5 or 7 pin audio amps.

If you play real loud you may overheat the chip and it will go into shutdown to protect the chip.

Sometimes htey don't put adequate thermal conductive grease on the chip causing it to overheat.

Remember this is a small practice amp, not a powerhouse.

It sounds like it is going into "motorboating" as it is called.

Posted on Dec 12, 2009

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Posted on Jan 02, 2017

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I turn my fx off but can still here it and the od sound is lower than the fdx button when i push it in to turn it on


2 things 1: there is no off button for the built in digital effects, you just turn the level down to minimum, the fdx button you speak of is actually fdd (frequency dependant damping) this is supposed to mimic how a tube amp sounds

2: when you press the od switch the amp goes into hi gain mode and will hiss with no input, the point is if you plug a guitar in and play it the volume of the guitar is way above the hiss and you don't hear it

so in conclusion having bought and sold many mg series amplifiers the on you have is perfectly ok

Mar 10, 2012 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

When I use the over drive effect channel the head makes a rapid beeping sound.


Make sure your guitar cannot "hear" the amp as the guitar can be a pretty good microphone to cause feedback. Feedback sometimes saturates an amp and causes "squeging" which is a cycling into and out of feedback.

Apr 22, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

2 Answers

Hi, My Aria AS-690B Sinsonido has started making a strange crackling / low grumbling noise when plugged in. It still plays well, but the noise gets very much in the way. It sounds electronic. Any ideas...


First thing is to check that batteries are good. Next, verify your guitar cable is a good one... some are microphonic and the cable can actually insert noise into the signal. The plugs on cables can sometimes be noisy as they move while playing. Try to keep the guitar from "hearing" the amp as it can create feedback. Verify the amp itself isn't the source of the noise. Try a different guitar. The input of the amp is grounded by a contact when cable is removed, If there is a problem right in the input stage it can be masked. Plug only the guitar cable into the amp... Is ti quiet? If so make sure to try the first few suggestions. ALso be aware of other noise producers like fluorescent lights an dimmers... these generate electrical noise that sensitive guitars can pick up.

Apr 14, 2011 | Aria Sinsonido AS-100C

1 Answer

This bass squels if you have a bass head and cabinet. i had a 100W amp and it played fine then upgraded to a head/cab. tryed playing it with loud volume, squels. anyway to fix this?


Turn down the treble gain and mid gain... you don't need it for a bass. Prevent the guitar from "hearing" the output of the amp directly. The guitar strings make a good microphone.

Feb 27, 2011 | Epiphone EBO Electric Bass Guitar...

1 Answer

1) how to make my amp record....because its not working when i try... 2) do i have to a cord in line 1 and 2??? 3) do i have to plug in the cord in :.....line in or line out??????


You will use microphone with balanced XLR connector into the XLR mic input. Note, the ALpha does NOT have phantom power so you cannot use condenser mics.

A guitar can be plugged into the hi-z instrument 1/4 inch jack on the left front of the unit.

To use the line 1/4 inch inputs you will use BALANCED TRS 1/4 inch cables from your source.for these channels. The level on these needs to be line level.

The line outs are for sending audio out to an amp. There appears to be RCA outputs you can use as well.

I am not sure what you mean by making your "amp record"... An amp PLAYS the audio, usually into a speaker.

If you are trying to play a guitar through your amp AND record, then you will connect your guitar to the Alpha, the amp input will have a cable from say Line 1 OUTPUT and when recording wou will have the echo feature on so your guitar is passed through to the amp.

Jan 09, 2011 | Lexicon Alpha Personal Recording Studio

1 Answer

I have a Marshall MG100DFX. I turned my amp on a few days ago and I heard this loud sound (not the standard hum/buzz that you hear when you plug a guitar into an amp; it sounded more like a foghorn). Now,...


I would try hitting the side of the amp before turning it on. There may be a loose piece of solder or other conductive particle stuck somewhere. Bang the cabinet rather hard with your fist. If that doesn't help it might be a loose solder connection at a resistor or capacitor but a tech should check that out.

Dec 04, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Basically, I turned it on, played it, turned if off, went back to play it and I got a humming noise then it went dead!!??


I suspect either the power supply rectifier developed a short which would likely blow a fuse till repaired OR the power amplifier chio went bad. Most of the smaller amps use some version of the TDA2050 audio amp chip. It looks like a power tab transistor (TO220 stylle case) with 7 leads.

If it went, it did so for a reason... time for unit to be serviced.

May 26, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

Where is the serial number on my marshall amp mg15fx


Behind the amp, right around where the power-supply is. Usually the right hand side at back of amp. Serial numbers are labeled as: S/N########

Mar 14, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

No output from my Marshall MG15DFX


could be effects module or sound output i.c. also check send and return jacks

Feb 04, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

Input jack replacement


oh yes it can be fixed quite easily,...but you are best to bring it down to your local music store and have them do it, they'll be fair in price and your amp will be done right,....(no time for that breakin down stuff when your playin your guitar), thanks, cracklin joe

Jan 07, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

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