Question about Marshall Amplification Marshall MA Series MA50C 50W 1x12 Tube Guitar Combo Amp

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No power on my marshall ma50c

No power changed the fuse but did not work any answers thanx

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Where is the fuse located in a marshall ma100 h amp head


The fuse should be located on the back panel near the power cord. However, there are also internal fuses as well....If the amp is vacuum tube you will also have a HT fuse as wall as a power fuse. If it is a solid state unit then it will have a power fuse.. Hope this helps.....If you need more info let me know....

Jan 16, 2014 | Marshall Amplification Marshall MA100H and...

1 Answer

My Marshall 4502E Amp switches on fine. However when you flick the STANDBY switch on it blows the 1.3A Fuse every time. Any solutions, baring in mind I have checked all the diodes, resisitors, rectifiers...


I would first check the filter electrolytic caps for shorts...

This is the WAY you work on this problem. Replace the fuse and put a 60 or 100 Watt incandescent lamp in series with the HOT power wire. This acts as a current limiter/automatic resetting fuse and you can search out where the current is going. Old trick we have used for more than 50 years. Also using a Variac to control the voltage can be useful, but the lamp should get you through the problem...

Feb 10, 2011 | Marshall Amplification Marshall MG250DFX...

1 Answer

I need to replace the fuse for a used Marshall MG100HDFX that I bought. Where is the fuse located inside the head?


If the fuse is blown make sure the reason it blew is repaired before replacing the fuse. Start the amp up after replacing it with a 100 Watt light bulb in series with the hot side of the power into the unit. This will act as a current limiter to verify it is repaired and will not blow the fuse. When you open the unit the fuse will be obvious... Follow the hot side of the power cord, through the switch to the fuse.

Dec 08, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Have marshall mg100 hdfx head -power it up and blows fuses right away!


This is either a shorted component in the power supply section or in the power amp electronics itself. Continuing to replace a fuse MAY damage additional components. Take unit in for servicing.

Nov 29, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

So, i think I've blown the fuse in my Marshall MG 100 HDFX head (I tried to run 2 speaker cables out of the head into a quad...stupid >.<). What type of fuse do these heads use? How can i access...


The fuse is inside the unit so as to force you to open it and look for damage.

The fuse is likely a 3 amp/250 volt type.

Replace the fuse and then put a 100 Watt light bulb in series with the hot side of the power input. If the lamp stays lit with no load on the unit, then there is damage that requires repair before use. If you just replace the fuse repeatedly you may damage further components.

In the future obey the minimum resistance load on your amps.

Aug 22, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Blown fuse


Continued replacement of fuses without fixing the reason for them blowing MAY be doing additional damage to components in the unit.

It needs to go to a repair shop. It is likely there is damage in the power supply section or that of the power amplifier section.

Feb 28, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

2 Answers

Hi im in Argentina and i accidentally pluged in my amp without an adapter now it doesnt work what needs to be fixd?


The power supply is blown. Argentina is 220V I believe. I have never seen a power supply schematic for this however being that it is low power it is a linear supply not switching. Either the rectifier diodes are blown out or possibly the output capacitors are blow due to approx double voltage. If you try this yourself be careful otherwise get a new amp. Good Luck

Dec 14, 2009 | Marshall MG10CD 10 Watt Combo Amplifier

1 Answer

Power does not turn on for a marshall avt150h amp. most likely a blown fuse. got it a year ago and never had to get replace the fuse before. don't want to make a mistake. need instructions on fuse...


If the fuse blew for a reason, replacement MAY do further damage.

The way to test is to put a 150 watt light bulb in series with one of the power input wires and replace the fuse. The lamp will limit the current so further damage would not be done.

If lamp stays off and unit works, you are good to go. If lamp stays on, then service is required.

Aug 30, 2009 | Marshall Music

1 Answer

Is there a circuit breaker


There should be a fuse holder near the place in the back of the amp where the power cord plugs in. Also some Marshalls have fuses in fuse holders on the circuit board. Always replace with the same value and type as the original fuse. Never open up the amp when it is plugged in to the outlet. When replacing the internal fuses do not touch the capacitors as they retain a lethal charge. If the fuse continually blows it is an indication of a more serious problem which will require servicing by a qualified repair person.

Jun 25, 2009 | Marshall Amplification Marshall MG250DFX...

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