Question about Marshall Amplification Marshall MG15 15 Watt Combo Music Instrument Amp

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Hi, my name's John...i have a problem with my Marshall MG15..everytime when i switch the Treble power over or above limit 5 it makes i little noise like getting interupted then it goes off. Then i can't hear the sound of the guitar only if i turn the volume up, but it faded.....I can also hear the sound of being interupted when i toggle other buttons like bass or volume. This is when I set it on overdrive....but it also happens when I switch the channel on Clean...Weird thang though, i just bought it for 2 months now...

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It sounds like you bought a defected amp. You should contact Marshall and tell them the problem. You should have some kind of warranty.

Posted on Apr 04, 2011

  • ionut746 Apr 05, 2011

    For falefire777: yeh i know that myself..but i wanna repair it on my own. However tanks for the hint man ;)

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


Hi, I have repaired loads of these kinds of amps. The first thing to check is if the input jack socket is still soldered to the circuit board properly. These have a tendency to break.
They all have a dual opamp and a 15 watt power amp chip. Invariably it is the power amp chip that fails IF it is an electronic fault. Both chips can be bought for a few pounds.
The variations, aux input, spring reverb and this, digital effects are extremely unlikely to cause this kind of failure.
At one time anyone with a screwdriver and a soldering iron could fix these, but in the days of health and safety, find someone who knows what they are doing.
It should take half an hour and about £3 worth of bits.
All the best, Chris the Fader.

Jul 04, 2014 | Marshall Amplification Marshall MG15 15...

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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1 Answer

Serial number, where is it located?


Some Marshall serial numbers might tell you the year your 3005 was made, Marshall stamped the different years of the micro's in different spots, your number could either be on the back metal plate stamped right above the AC power cable port, or barely visible on the front gold plate above the power switch just under the Tolex, at least that's where my 1988 3005's serial number is stamped. But it should have one on it somewhere, could even be inside the head too, my sis plays and has an old 1977 50watt tube head with an interior serial number. I've been a huge fan of the Micro stacks since they came out in the mid-80's. I believe the 3005's were only produced from 1985 or so till around 1988 or 89 in Black, White, Red, Orange, Blue, Purple, and Grey, a Camo Tolex was a custom option as far as I remember. 1987 was Marshall's Silver 25th Anniversary, so a Silver Tolex Jubilee edition was made that year only. Than the newer MG15-II's were made from around 2004 till 2010 along with the Zakk Wylde signature series micro stack,. And now they make the newer MGD's since 2010, I just tried one last week at my local guitar shop, I liked it a lot, it's very different sounding than my old 1988 or my 2009 micro's and has a few built in effects which weren't great, but not that bad at all, I have a 1988 3005 stack that came with Celestion G-10's in the cabs and an MG15-II series micro stacks, that one came with some no name 10's, but believe it or not they sound better than the G-10's! Mine are all in black, I have been after an original micro stack in white for many years.Did your old 1x10 cabs come with Celestions too?

Apr 23, 2014 | Marshall Amplification Music

3 Answers

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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1 Answer

My input jack's nut has came loose and it fell into the amp. HELP


Open the unit and restore the jack to the proper place. Do NOT overtighten the input jack mounting nut.

Feb 01, 2011 | Marshall Amplification Marshall MG15 15...

1 Answer

Is there a way to mod the hd100fx head for more bass?


You are ultimately limited by the available power of the internal amp. You can set controls for bass boost and turn off the treble but there is only so much power available.

HINT: If you are using speakers smaller than 15 inch, that will limit the bass as well. Use larger efficient speakers.

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1 Answer

Hi i am john... i have a 100dfx mg series... it is


There are MANY more likely components than the transformer that will cause the fuse to blow.

Most common are filter capacitors, rectifier diodes, and shorted components in the power amp section.

Transformer failure is very UN-likely. Have a competent electronic tech troubleshoot the unit.

When testing the unit, put a 150 watt light bulb in series with the power line... saves fuses during troubleshooting. This limits the current so one can analyze the real cause of the problem.

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1 Answer

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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