Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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Marshall amp goes quiet

My amp is about 4-5 years old and one day it decided to be really quiet and when i turn it all the way up it hardly puts out a sound. What could this be?

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Often this is a broken input connector or an electronic failure such as a tube or semiconductor device.

On some units a failed switch on a jack for direct input to the power amp can cause this. Oxidation at the contacts causes this problem.

Posted on Apr 27, 2010

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Yeah i would consider replacing your eh preamps with some jj ecc83s pramps (its a 12ax7). also, volume loss is usually something shorting to ground, i would assume a smaller electrolytic cap in the preamp somewhere. look for bad solder joints and overheated areas on the circuit board, indicating a potential cold solder joint/ a cracked weld and resolder the part at the least. the parts that get the heavy use are the input jacks volume pots, etc. look there also for bad solder joints.

Posted on May 07, 2010

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