There are some basic things you can try before you suspect the amp. Does your guitar cord work in another amp? Is your guitar sending sound through your guitar cord? Without any thing plugged into your amp can you hear a slight hiss when you turn your controls up on your amp? Here is a link to some things you can do to troubleshoot the problem:http://www.geofex.com/ampdbug/ampdebug.htm Even though the info is for tube amps a lot of it also applies to solid state (transistor) amps like yours.If it turns out to be the amp and you don't feel comfortable working on it and have no one that you know personally to do it you are best served by taking it to a certified Marshall repairman who will have the tools, parts and schematics to help you.
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