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No sound from my Marshal Guitar Amp - Audio Players & Recorders

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Your Ic audio amplifier maybe is damaged

Posted on Apr 13, 2008

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I get a humming sound when I plug my Gibson SG straight nto the amp. The noise fades and strengthens depending the positioning of the guitar in relation to the amp.


Your Gibson is sensitive to magnetic fields You need to keep the guitar about 10 feet away from the amp as the power transformer is radiating magnetic fields that is causing the hum. Solutions: there aree several... most are NOT practical... such as encasing the transformer of the amp in Mu-Metal shielding. Changing the transformer to a toroid type (they should deliver them that way) encase the amp in a thick steel cabinet... all this is ridiculous... putting distance between teh amp and the guitar is probably the only practical solution. The level given any particular orientation should fall off with the square of the distance. Note that OTHER stage equipment also will have transformers that radiate. Much of the new amps do NOT have power transformers that run at low frequency so they don't have this problem. Marshal is old school and they use the older power supply designs that radiate the magnetics.

Apr 16, 2011 | Marshall Amplification Marshall MG15FXMS...

1 Answer

Where is the serial no. on a mhz40c


The serial number for this will be on a sticker on the back. If it is missing then perhaps someone removed it. You may be able to contact Marshal and they may be able to tell you as well. http://www.marshallamps.com/

Mar 22, 2011 | Marshall Amplification Marshall Haze 40...

1 Answer

Hi. I have a Marshal MG10CD amp. It was working fine, till a few days ago, when it suddenly stopped functioning. The amp gets power supply, as you can hear static when switched on, however, when the...


Check for a dry/cracked solder joint where the 1/4 inch phono input jack connects to the printed circuit board. Solid state Marshalls are renowned for this.

Feb 23, 2011 | Marshall MG10CD 10 Watt Combo Amplifier

1 Answer

I was playing my guitar on my marshal until i noticed the volume started to quit down until the sound totally died out. and now the amp is turned on and all the valves are on but theres no sound whats so...


Just because the voves are lit doesn't mean there is the high voltage power to the valves.

ALSO the smaller valves have TWO heaters in them and if one half has burned out that would cause the symptom. Check if the smaller 12AX7/12AT7 types all have two heaters burning. Verify that the standby switch has not gotten bumped off.

Jan 19, 2011 | Marshall JVM410C 100 Watts Valve Guitar...

1 Answer

When turning my Marshal MG250 DFX on, there is a terrible buzzing sound. I have tried it on different speakers and the buzzing still occurs. It does not change in volume when i adjust the volume. Whats the...


This is likely a filter capacitor issue. The right tool to troubleshoot is an oscilloscope. This could also be a failed power amp that is driving high DC current with ripple into your speaker. This can permanently damage the speaker. Repair this before using it.

Jan 13, 2011 | Marshall Amplification Marshall MG250DFX...

1 Answer

I was playing my Marshal 100DFX for about half an hour and when I was done it smelled like burnt electronics. Then I noticed the fan wasn't working. It usually turns on right when I turn the power on. I...


Replace the fan with an IDENTICAL part. Do this before using the unit again.

There is a possibility that the fan is controlled by temperature and the failure is actually with that electronics rather than the fan itself.

May 19, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

By mistake i plugged the speaker jacks from another amp into the speaker jack on my mg 50. i was trying to test the other anp with the speaker on the marshall but i did it wrong. i didnt turn the marshal...


If you connected an external speaker plug from one into the same type plug on another amp, you have driven signals backward into the amp that was off... NOT into the speaker in that unit.

The usual result is blown parts in the amp that is off.

Some amps have their own speaker cable that you can unplug to connect to another amp and that is fairly safe. NEVER run an amp without a speaker load on it.

Feb 20, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

My Marshal MG30DFX has started to boom with excessive sustain even in a clean state with controls at minimum when using my Epiphone les paul...any ideas what's wrong


Sometimes the sound can feedback onto the strings of the guitar effectively sustaining.

Also check it with reverb off. Sometimes the effects loop and create sustain.

Feb 09, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

While playing, the volume cuts up and down in all the channels.


Fiirst check if your input connector is bad. Move the cable right at the connector and see if the volume jumps... HOWEVER before doing that even, verify your guitar is not the problemm using another amp.

If it is definetly the Marshal, it will likely need servicing.

It could be a bad volume control or a cracked circuit board.

Feb 03, 2010 | Marshall 15 Watt Guitar Amp

1 Answer

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


I suspect the vibration when it is loud is vibrating a reverb tank within the unit.

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

It may be the reverb has a resonance or the cabinet does that is sensitive to your E chords.

The shock mounting of the reverb may have failed to isolate the reverb tank from speaker vibrations... hence the headphone test.

Jan 27, 2010 | Marshall 15 Watt Guitar Amp

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