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Changing the input jack on a Marshall Valvestate combo amp

Need to know how to replace an input jack on a Marshall Valvestate combo amplifier

Posted by Anonymous on

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

CRTN
  • 716 Answers

SOURCE: Line 6 Spider 2x12 100w combo - Input jack issue

Its a 1/4" mono Panel-Mount Audio Jack
and can be bought at
Radio Shack, Best Buy, Any Music Store
Click Here

Average price about $3.00

Posted on Mar 10, 2009

  • 73 Answers

SOURCE: marshall valvestate 8080 1. when i turn the buttons they make a cracking sound 2.when i play on it the sound becomes very quiet

When turning the knobs you might get a crackling noise if the amp is old, The knobs get worn. Either you can replace them or repair them with a tiny squirt of WD40. Check youtube videos for help.

As for the fading sound, That would be your valves ... They need to be replaced ... I suggest taking it to a repair dhop for that because they need to be matched.

Posted on May 23, 2009

  • 1 Answer

SOURCE: The input jack on my Marshall MG100FX has fallen

I just had this problem and wasn't able to find the solution on line, so, here 'tis.

Take off the six screws on top of the amp cabinet. Unplug the speaker plug from the amp jack.The metal amplifer box can now be pushed out of the back of the cabinet and the input jack remounted. I had to force the box a bit as it was glued in just enough to tack it into place. (I was afraid to force the electronics box out so I took the entire cabinet apart piece by piece until I could see there was nothing left holding it in.) I found that prying it this way and that with a butter knife helped crack the glue.

Posted on Jan 19, 2010

  • 5603 Answers

SOURCE: i've a marshall valvestate vs 102 r and i want to

Why would you waste the time to try and modify it? What do you hope to gain? The designs are usually optimized with the parts they build them with. Even the speakers are selected to match the cabinet characteristics.

If you are dissatisfied with the unit, sell it and buy another that you like. It is unlikely you will get any better performance than the basic unit as supplied. You will waste a lot of money for nothing. If you want good bass for instance, use nothing less than a 15 inch and preferably 18 inch speaker or a quad of 12 inch ones.

Remember the performance is not only the speaker but the cabinet air volume and sound ports. For midrange and highs, use a horn with driver. Finding good PROFESSIONAL music rated speakers will be hard. Do NOT fall for the idea of using car stereo speakers for instrument music, that is futile as they are not designed for that function. Those are very inefficient speakers to start with.

Posted on Feb 15, 2010

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1 Answer

Marshall repair valvestate 8080


if it is C1 then it's the input capacitor from the instrument jack input, it's value is 10nF, as to it's type it could be 1 of three and I don't know without seeing it although all would work, from cheapest to most expensive, they are :- mylar, polyester or polyester film.

Good luck.

Aug 17, 2014 | Marshall Amplification 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

Hi There, i have a Marshall MG100 DFX Series Guitar Combo Amp,and when i plug my guitar in i get verry little,or no sound from the guitar imput,can you please help. Thank you.


Try exceriszing the connections for input and headphone jacks ( just be inserting qtr inch connector in/out of jack ) a few times. then plug back into your input. if that didn't solve anything while amp is on move the input jack around ( up, down, left, right, ) and see if this makes the signal cut in/out to normal playing. if so you just have broken solder connections on the jack. Also you may just want to test your Speaker to make sure no problems exise there. ( Voltmeter across + and - terminals ) prolly 8 ohms but will most likely state on woofer. if not of this fixes your problem let me know and i'll throw some more steps your way.

Jan 24, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

I have a MG50DFX and a MG15DFX, both amps head phone inputs don't work anymore. When plug in the headphone the speaker won't silence.


This is likely a bad switch contact in the headphone jack... they are really poor quality in most amps... plastic case and EASILY damaged by side forces on the jack. REplacement is the solution.

Nov 29, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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

Marshall mg10cd amp has no volume


Common causes:

Broken input jack.

Blown power amp chip due to overdriving.

Smashed pots due to tipping over or transportation damage.

Blown power supply due to bad power at a venue.

In some cases, grounding the headphone jack can blow amp.

Feb 11, 2010 | Marshall MG10CD 10 Watt Combo Amplifier

1 Answer

I have a 30th special edition,,1962,,1992 marshall amp and want to know how to set up,,has jack plug in back,,not sure where it goes,,??


Well if there is anything you need to insert into the effects loop IE, wah pedals, noise gates etc etc the return is the output of the effect and the send would go to the input of the effect. As far as inputs those are all on the front panel.

Jan 08, 2010 | Marshall Amplification Marshall MG250DFX...

1 Answer

Input jack replacement


oh yes it can be fixed quite easily,...but you are best to bring it down to your local music store and have them do it, they'll be fair in price and your amp will be done right,....(no time for that breakin down stuff when your playin your guitar), thanks, cracklin joe

Jan 07, 2010 | Marshall Mg15dfx 15-Watt Combo Guitar...

1 Answer

Hi, I have a Marshall 8240. The Reverb output


probably the reverb tank These coils are very thin and tent to break easily

Nov 05, 2009 | Marshall Amplification Marshall MG250DFX...

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