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Marshall input jack - Marshall Amplification Marshall Vintage Modern 2266 Amp Head

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Posted on Jan 02, 2017

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SOURCE: How do i fix the input jack for a marshall 100tsl

It may be dirty, spray it with contact cleaner, and also make sure the retaining nut is tight and solder connections are sound.

If the jack is actually damaged, you can get suitable replacements from http://www.tubesandmore.com Digikey and mouser have them too, but the price is about the same with less searching.

Also check to make sure any connectors into the preamp are snug and secure as well.

Posted on Apr 12, 2012

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1 Answer

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).

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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.

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1 Answer

MARSHALL FOOTSWITCH FOR DSL100 TROUBLES


Does your M foot switch work on the Fender? If you know how to use a multimeter you could check continuity by putting meter leads on plug of M foot switch(1 on tip, 1 on sleeve ) You should see a change in the multi meter when you depress switch. If so switch is good. Another easy test is with cap off a spare 1/4 plug -plug it in to foot switch jack.put a alligator or some such metal clip or wire and join(called short or shorting) the two inputs . If connecting and unconnecting results in switching then the foot switch is suspect. One fairly common thing is that foot switch and input jack are often sautered straight to a circuit board to save $ on production cost. Used to be all point to point where a wire was attached to 1/4" input and then wire went to circuit board or tubes. The wire has give, but not so with direct wiring to board. So the nut holding the 1/4" amp input gets loose(doesn't have to be loose for the following to happen) and a pull on the chord causes a break in the soldier and thus a break in the sound chain. Sometimes it will work intermittingly by putting a little pressure left, right, up or down on the plugged in plug. If so, it's the input jacks connection to the amp. If not it still could be that because putting pressure on plug may not be sufficient to affect a temporary reconnection. Since switch(the new one you made)works on Fender, but not Marshall I suspect the jack or foot switch circuitry past the input jack. If using some of the above the above tests leads you that direction,remove housing(unplug a/c power 1st ) inspect jack,wiggle it slightly see or feel a break then resodier from back side. You should be able to use the soldier already present without adding extra.

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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.

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1 Answer

My input jack's nut has came loose and it fell into the amp. HELP


Open the unit and restore the jack to the proper place. Do NOT overtighten the input jack mounting nut.

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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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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.

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