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Marshall jvm1 volume,gain letters wearing away?

On the jvm 1 marshall amp,the gain knob letters are wearing off from the metal face.

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: MG100HDFX Amp - crunch setting seems too loud

There are 2 channels, Which means there are 2 sets of knobs ... One for clean and one for crunch. Start out with a low master volume and set up the crunch, Then the clen and switch between the 2 and make adjustments until they match volume wise ... Then turn the master up.

Posted on May 23, 2009

  • 1 Answer

SOURCE: I have a Marshall guitar amplifier model MG50DFX,

I have the same problem. It would appear that this particular series of Marshall amps have a "bug" in them. There are at least 10 other MG50DFX owners, some here at Fixya, others at Harmony Central that have the same problem. Check out the other replies to this problem here at Fixya. I'm gonna try spraying the jacks and pots with a good cleaner. Then, I'm gonna try inserting a patch cable between the FX in and out. This seems to produce sound according to the other replies here at Fixya. Although this may not fix your amp, or mine, for that matter...I'm gonna try everything I can before I have to send it off for repairs.

Posted on Oct 28, 2009

  • 5603 Answers

SOURCE: Marshall MG50 DFX, the volume knob OD channel crackles

Either the control is damaged (happens if they get hit) or it is possible the circuit board it is mounted on has broken solder OR worse, a crack near the control. The unit will require servicing. Parts are readily available.

Posted on Jan 31, 2010

  • 5603 Answers

SOURCE: 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.

Posted on Feb 15, 2010

  • 5603 Answers

SOURCE: Behringer's Ultrabass BXL3000 Gain knob broken

You need to replace the potentiometer with the broken shaft. You can open the unit and try to get a part number or go to Behringer parts to get an exact replacement. The pot must be matched for value, taper, and mounting and shaft dimensions.

Posted on Jun 07, 2010

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The guitar is not amplifying


faulty lead? when the lead is plugged in turn the amp distortion on (may be called 'gain') and when you tap the end that goes into the guitar with your finger you should hear a buzz. try another lead if not, and if it still doesn't work make sure that volume is up on the amp and the guitar. there may also be a knob in the back of the amp, turn that up too (but not all the way or when you do get it working you'll blow the speakers out).

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Jvm 410h squeals with feedback in most distorted modes at about half volume even when guitar volume is off


Test if it does it with the guitar cable unplugged from the amp. If it does, then it is time for servicing... If not, then you have a system grounding problem and the guitar cable is "leaking" signal into the amp. This can happen even if guitar is NOT connected.

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I run a pod HD 500 into the amp and It breaks up, like there is a blown speaker sometimes.


The Marshall is a super clean acoustic amp.

The POD is overloading the amp.

Try the electric guitar input and keep the gain on the amp down, keep the EQ level and use the POD and the end volume to adjust the final volume.

The normal inputs is for a low output acoustic pickup - the POD is a high output electronic source.

Start with the Marshall gains low and get the clean sound good, then work on the gritty sound.

The amp is voiced for a sweet clean sound - if you want grit'n'ball change to a 50w Marshall valve head and a 4 X 12 cabinet.

Horses for courses

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Its a marshal 8080 valvestate 80 v and it buzzes and some of the knobs crackle when turned,


Buzzing could be normal for this amp, especially if you have the gain cranked way up (or the volume way up) see if the buzz goes away when you turn the gain/volume down. If not, there is a problem that needs to be properly diagnosed by the amp tech at your local music store. The crackling is also unfortunately rather normal for an amp that's a little older. Oxidation builds up inside the knobs and makes that noise as you turn them. If it only happens when you change settings I wouldn't worry about it, but if it gets bad, a tech guy can clean it out for you.

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Hi I have a marshall haze15w amp and stack, the problem seems to


There are many models of Marshal amps icluding 15Watt types.

First thing to try is to see if headphones have normal volume. If they do, then the headphone jack switch that connects the speaker is LIKELY bad.

If the headphones do not have any volume, LIKELY causes are:

1. Fried output power amp

2. Volume pot is broken or has bad solder joints to the circuit board.

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2 Answers

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.

Feb 14, 2010 | Marshall Amplification Marshall MG250DFX...

4 Answers

Gain knob produced crackling sound


This is usually caused by oxidation in the potentiometer (fancy name for your volume control, also called a pot). The solution is to buy a small spray can of tuner cleaner, then unplug the amp and partially extract the electronics chassis from the case -- usually by removing screws in the top (but NOT usually the top handle screws), then gently sliding the chassis forward until you can easily see and reach behind your gain knob. You should see a squashed metal cylinder attached thru the faceplate to that knob -- that's the pot. It will probably have 3 wires attached -- don't worry: these never have voltages high enough to feel even when the amp is on. Either near where these wires are attached or elsewhere on that cylinder there should be one or more small holes. Using the small plastic tube that came with that spray can of tuner cleaner, spray a small amount of cleaner into the pot, then turn the gain knob from maximum to minimum and back several times. I usually do this by plugging the amp into a receptacle and moving the knob this way BEFORE using the spray, listening for the noises, then I spray it, manipulate the knob as described and hear the noise disappear. Unless you're confident about doing that, DON'T! Instead, slide the chassis back into the case and plug the amp in, then see if the noise is gone. If so, put in all the screws and you're done. If there's a noticeable improvement, but still some noise, move the knob bank and forth a few more times to see if that fixes it; if not, unplug the amp, slide the chassis out again and repeat the spraying procedure one time, then reassemble the amp and plug it in. If your problem is still not gone, you'll have to replace the pot. If you know how to solder WELL, you can order another volume pot thru a Marshall dealer or online, OR you can remove the pot and take it to a local electronics store where they can probably find an equivalent potentiometer at a lower price than the genuine Marshall part -- be sure to ask for one with "an audio taper" (a geometric chance in resistance that corresponds to how audio amplifiers control sound). Good luck, and please post your results on this website.

Jul 08, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

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MG100HDFX Amp - crunch setting seems too loud


There are 2 channels, Which means there are 2 sets of knobs ... One for clean and one for crunch. Start out with a low master volume and set up the crunch, Then the clen and switch between the 2 and make adjustments until they match volume wise ... Then turn the master up.

May 12, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

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