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I have a Marshall JCM 2000 Head. It is quiet when fully On but as soon as I plug into the INPUT Jack is starts crackling and hissing. When I unplug it's stops. Could it be the INPUT Jack

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Please see my other answer.

Posted on Dec 13, 2016

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Marshall JCM 2000 cracking hissing noise only when I plug into it. INPUT Jack ? Or FX jacks. ?


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MY Marshall JCM 2000 100Watt head is quiet TURNED fully on stand by OFF and ready to plug guitar into the INPUT Jack. Soon as I plug into the INPUT Jack cracking noise hissing noise.


I would suspect a bad cable. Also, these symptoms show up if you mistakenly use a speaker cable (unsheided) as a guitar cable (shielded).

Dec 12, 2016 | Marshall Music

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Hi I have A Marshall JCM 2000 TSL122. It starts out having full sound then all of a sudden no sound then after a few seconds, minutes or several minutes sound is back!


I suspect it's your input jack if it stops working immediately and comes back immediatly rather than fading in and out. Give it and any other jacks a good cleaning and see if it helps.

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Low volume on my marshall


I am very new here and don't know how to answer a question to a specific problem so I will write about the most common problems that I have had over the decades doing guitar amp repairs. If you find that your amp is extremely low in volume and then suddenly comes back to normal- check out the effects return [or power amp in] jack. Especially in Marshall amps-these corrode and your signal dies. If there is loud noise such as hissing and crackling with no guitar patch cord in the input jack- the input jack is likely at fault. They normally have switching contacts that ground part of the input circuit when the 1/4 inch male plug is disconnected. When this in is corroded or too weak to make normal contact, you can get these symptoms. If your amp is a solid state Marshall or Fender and there is a random buzzing sound with no guitar signal connected- hit the side of the amp and listen for the buzz to go away or become louder-if it does, this usually means that the connections are loose at the two large filter capacitors. In one or more Marshall amps, they use a filter circuit in the low voltage power supple for the preamp tubes. If you encounter a dead Marshall[the model escapes me now] remove the circuit board and resolder the four connections at the bottom of the bridge rectifier. If you have any other amplifier repair questions you can email me direct at computerlen@hotmail.com.

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I got a Marshall MG100HFX Amplifier for guitar. The problem is that whenever i turn treble switch on it gives clean sound as it should, but in couple seconds it fades away. When I turn the switch again it...


I haven't played or worked on a MG100HFX but I understand amp circuits very well. The behavior you are describing sounds to me like a bad capacitor in the Treble circuit. This is a problem that would require the skills of an experienced amp tech. If you are within your warranty period you might want to return it. If not, a good local repair shop should be able to diagnose the problem.

Good luck and keep rockin'!

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I have a marshall JCM 900 when I plug in my foot switch and try to play it pops and cracks .I know it's not the foot switch or my guitar.I checked the tubes they look alright so what part is broke in my...


I doubt that you have checked the tubes... tube checker's are rarity now and you can't look at a tube and "tell it is alright". If you leave the footswitch out does it do the same thing?
The probllem could be many things...and you haven't mentioned how you tested the items you are exhonorating. A common problem is a noisy or broken INPUT jack. Musicians forget to loop the guitar cord through the handle and the cord gets moved and yanked sideways wearing the jack and often breaking internal parts. Yjos also goes for the cord to the footswitch as well. Cords and connectors/jacks are the common problems. Less common but frequent are damaged volume control pots due to damage when handling... including broken solder where these attach to the circuit boards.

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I plug my input in and my guitar wont play on the amp unless i wiggle the cord and unplug it and plug it back in a million times


The input jack is likely broken... a COMMON problem.

To avoid this in the future, loop your guitar cable through the handle so when cord is yanked it doesn't break the jack by yanking it sideways.

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Marshall DSL 100 - volume fades away and gradually comes back on


IF this is a vacuum tube unit, these symptoms are that of a tube that the heater is intermittent, that is it cools off due to a break and then liights again.

Open the back and observe the heaters in the tubes. DO NOT be fooled by some that have TWO heaters in them. (use a mirror if necessary) A single one that comes and goes can cause the problem and the voiration can make it come and go. This behavior in a tube is NOT somthing readily spotted in a tube checker. The delay in fading and coming back would be the delay in warm up following a heater going out and cooling.

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How can i get rid of the hiss and popping from my amp


A relatively quiet "hiss" is normal and is due to the statistical properties in electronics. If the level is noticeable during normal program play, then it needs to be dealt with.

First thing is to verify the noise is still there with NOTHING plugged into the input jacks. Many times the noise comes from bad cables and guitars that have noisy on-board electronics, so we must check this out by unplugging all inputs.

MAKE SURE any other devices connected to this that require connections to the power input ALL are plugged into the same receptacle.

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Marshall JCM 2000 dual super lead 50 watt going out on me


Very nice amp!

First off, is the amp getting sufficient power? An unreliable AC current from your wall can affect the performance.

Have you tried the amp with a different speaker? Checked for a loose connection from the amp to the speaker? Is it the correct ohms rating?

Second, are you experienced in electronics? The problem could lie in a faulty solder connection, a bad component, etc.

If you are not confident in opening the amp and troubleshooting it yourself, take it to a audio repairman. Marshall's are some of the easier ones to fix.....

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