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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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Posted on Dec 12, 2016

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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

1 Answer

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.

Jul 27, 2015 | Marshall Music

2 Answers

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.

Nov 14, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Marshall mg100hdfx head. I get no sound whatsoever plugged into the guitar input but the controls seem to work as I can hear changes in the light ambient static. I will get sound however if I plug directly...


You MAY have a broken input jack. If you can hear changes from the overdrive gain control, that control is just one stage away from the input jack. Also there is a capacitor C60 that is for RF bypassing and if that shorts that will kill the audio. Yes, inout jacks get destroyed by tripping over guitar cables... that is why you run the cord through the amp handle before plugging it in. Of course verify your guitar and cable is good using another amp.

Aug 30, 2011 | Music

1 Answer

How to connect the foot switch.


Using the CORRECT footswitch for this model, you just plug it into the footswitch jack. You MUST use the correct one for the model.

Aug 05, 2011 | Marshall Amplification Marshall MG50FX 50...

1 Answer

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.

Feb 11, 2011 | Marshall Amplification Marshall JCM800...

1 Answer

Hi. I've had this transistor Marshall head for about a year now but lately whenever I plug a patch cord in the input jack and turn the amp on, I get crazy amount of distortion. I know this only a problem...


A educated guess points to either broken soldering or a broken ground on the input jack itself. This is a CHRONIC problem of amps because people trip over the cord and it yanks the cable and jack sideways breaking it or the solder where it attaches to the circuitry.

To avoid the problem, loop your cable through the handle of the amp so when cable is yanked it doesn't yank the jack so hard.

Nov 16, 2010 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Hiwhat is the best way to connect my DigiTech RP10 to my Marshall MA100H Guitar Amplifier


Read your manuals for both pieces of gear carefully first. You only have one amp so you won't be able to take advantage of all the FX on the Digitech as a lot of them are designed for stereo. The Digitech manual shows guitar into the Digitech and output from the Digitech into input of any guitar amp. Since you have a Marshall and can already get some great sounds by running your guitar straight into the Marshalls input, you would probably be better off using your Digitech in the FX loop. Run a guitar cord out of the send on the loop into the input of the Digitech and a guitar cord out of the left / mono output jack on the Digitech into the effects return jack on the Marshall. Start out with the effects level on the Marshall all the way down. Do the same with the Digitech with both the input and output levels. (Read the manual carefully) I think the choice of the Digitech isn't that great because it is already trying to reproduce a lot of what you can already get with just your Marshall but with a little experimentation and some careful adjustments you should be able to add to the sound of the Marshall. Hope this helps.

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2 Answers

Marshall MG50DFX is cutting in and out


Often the bypass contacts on the FX insert jack fail to close. These jacks are really poor and after plugging in a plug several times the bypass switch contact becomes sprung so as to not make good contact causing symptoms like yours.

Open the unit and inspect the jack. You can bend the contacts to tighten them BUT they will fail again.

Externally sometimes you can make a short jumper cable to connect the preamp out to the PA in to bypass the failing contacts.

On an insert jack, you can just wire a TRS plug tip to ring and plug it in.

Jun 19, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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