Question about Marshall MG100HDFX 100-Watt Amplifier Head

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What causes a head to not put out sound? - Marshall MG100HDFX 100-Watt Amplifier Head

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This link might help if you have a tube amp:http://www.geofex.com/ampdbug/ampdebug.htm

Posted on Aug 22, 2010

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Marshall 600 silver series bass amp head


Hi, what speaker do you have connected directly to the head? What output are you using to go to the PA?

Dec 19, 2013 | Music

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...

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I have a Gallien Krueger Backline 600 head rigged to a GK Blackloine 410 BLX-II cab. There is a crackle sound emitting from all the speakers, so I'm guessing there is something wrong with the head. Have...


i) If the crackle is there with all input signal cables removed, then likely to be the head.

ii) Does the crackle vary noisily with control settings? If so, move noisy control to & fro about 10 times to wipe any dirt from internals (temporary solution).

iii) If ii) is not a problem, then tap head casing to check whether a dry solder joint or poor internal connection is the cause. Was unit dropped?

iv) If none of the above, then suspect possible component breakdown.

Jan 24, 2011 | GallienKrueger Gallien Krueger Backline...

1 Answer

I have a MG100HDFX head, with the cabinet that came with it and the other I plugged in, the amp sounded fine for about 5mins while i was warming up. Then it started to fade in and out with a very fuzzy...


I would first suspect the head... try driving a different speaker to isolate which is at fault.

If unit starts working when cooled down, it may be going into thermal protection due to any of several causes including a defect or overdriving it.

Nov 15, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

No sound


You would NOT use a stereo cable to plug in your guitar.

The stereo cable would carry the battery voltage back to the amp and MAYBE cause the fuse to blow.

You use a MONO instrument cable for your guitar.

The ring connection is use to complete the circuit to turn on the battery in most guitars.

Replace the fuse ONCE and get the proper instrument cable (NOT consumer audio cable) for your guitar.

If fuse blows again, take amp to shop for service.

May 30, 2010 | Peavey Valveking Head

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Marshall Lead 100 Mosfet head, no sound.


are you popping fuses??? check the effects, preamp, and power amp jacks to make sure they (even if not in use) are Normally Closed. Sometimes they loose their contact to ground on the Tip of the jack, which opens the circuit and interrupts the normal function. then check the input jack for good contact to the pcb and solder joints, as well as all pots (especially the volume). if all this checks out, and it still is having issues, i would then move on to the grounding resistors (solder welds can heat up and break as these resistors get hot) and resolder them to the board. still no output, then diodes / rectifier / filter caps.

May 01, 2010 | Marshall Amplification Marshall MG250DFX...

1 Answer

Roland XP 50 Head phone not working


Make sure that the level of the headphone out put is open. Make sure it is on manual adjustment and no auto level. And test your headphone on a other device to clear that your headphone is not broken. If all these options are correct you headphone pre amp of the XP 50 may be damaged or broken.

Mar 07, 2010 | Music

1 Answer

My mg100hdfx head shorted out and i replaced the fuse the fan also smoked and sparked when i replaced it and then i put in another and it still dont work what should i do


When the fuse blew you should NOT have replaced it without investigating the cause.

It is likely several components were damaged and probably more when you replaced just the fuse and tried it.

The unit needs to go to a shop now for refurbishment.

Feb 15, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

We plugged it up and turned the amp on and it made a pop sound and stopped working


sounds like you blew a fuse.
a bad ground could've caused this.
refer to the rear of the head.
Most have threaded screw fuses.
Replacements can be found at pretty much any music store

Sep 29, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

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