Question about Marshall MG100HDFX 100-Watt Amplifier Head

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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 said fuse to change it? (The head won't power on no more, which is why i'm assuming it's a fuse)

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  • Marshall Master
  • 5,603 Answers

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.

Posted on Aug 22, 2010

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Posted on Jan 02, 2017

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