Question about Marshall Mg50dfx 50-Watt Combo Guitar Amplifier

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My new mg50fx has a ton of hiss when i turn it on. anything i can do?

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Make sure the master volume is turned up and the inout gain is down some.

All of the electronic devices suffer from the statistical noise within the amplifying components. Keeping the inour gain down some tends to limit the gain where the hiss is most sensitive, that is the high gain in the "front end" or preamp section.

A "ton" is not a MEANINGFUL measure of the loudness of the hiss.

A meaningful measurement would be the Db relative to the normal program material.

Test with no devices plugged into it as the preamps in guitars can create hiss too. The hiss should be barely perceptable at 5 feet from the amp.

Posted on May 04, 2010

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I had this Amp for almost 4 years now, and suddenly got a problem a month ago. When I'm using it from clean sound it suddenly auto switch to distortion sound and vice - versa .


Normally that would be caused by a dirty footswitch jack or a broken (intermittant) cable on the footswitch itself. If neither of these is the problem, it will be a relay in the amp and will have to go in for service. Here's a link

http://www.marshallusa.com/service.asp

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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.

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6505 +112 has a bad hiss with nothing plugd in


Some hiss at high gain settings is normal. If you get objectionable hiss at 1 o'clock settings of gain, that is too high. Electronics has noise that is "statistical" in nature due to physics that we can't get around in design. Most hiss is created in the preamp area and swapping tubes in the first stage might help. By varying the volume controls and observing the level of the hiss, we may be able to analyze the offending staage of amplification. ALso turning up the treble controls will increase the hiss, as it is mostly in the higher pitches.

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I have an MG50FX amplifier that is less than half a year old and in the middle of playing the distortion will fade to the point of disappearing and will then suddenly come back in the middle of a note. ...


Many things can cause this... A COMMON problem is broken solder joints near potentiometer where they attach to the circuit board. Look for bad solder joints and also cracks in the circuit board.

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Constant buzz. even with no guitar plugged in


This usually indicates that your neutral and live are backwards. Try plugging the unit into a different outlet elsewhere (different room)
If it still is buzzing, look for a GOUND LIFT switch in the back, it may have inadvertantly gotten flipped to the wrong position.

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1 Answer

Buzzing noise when not playing


All amplifiers make a little bit of noise (hiss) but it is normally slight and drowned out by playing. However, assuming that this is not normal system hiss, here are a few simple steps to try and locate the source of the problem by process of elimination.
  1. SAFETY FIRST - a common cause of a humming or buzzing sound can be a lack of earth (grounding) on the mains supply. With a 240volt AC supply this hum will be at 50hz (in the UK) - frequency may vary in other countries but should be similar. Check the earth first because of risk of electric shock. Until you are satisfied that this is not the cause of the problem DO NOT touch any metal parts of the amp. Remove the mains lead and try a different one. Try plugging the amp into a different mains outlet socket (preferably one on a completely different circuit).
  2. Turn off other electrical equipment in the vicinity that may be causing interference. Move the amp a bit, try rotating it by 90 degrees to change relationship to things like mains electric cables in the floor.
  3. If you are using the line-out socket to give a feed to a mixer, slave amp or p.a. system unplug this. Sometimes double earthing (through the mains lead of your amp AND the mains lead of the MIXER / PA) will cause an 'earth loop' due to a different resistance at each end. Putting a DI box with an 'earth lift' in between may eliminate this problem. Alternatively there are little gadgets you can buy to do this (I found one intended for car audio systems on Amazon that works very well)
  4. Unplug any instrument leads - to eliminate possibilities of interference affecting cables, effects pedals or guitar pick-ups. Also unplug the foot-switch.
  5. If that stops it plug a lead in without a guitar on the other end - does the noise return? If yes change the lead. If no plug the guitar in.
  6. Try moving the guitar in relation to the amp (turn it around 90 or 180 degrees) - this will be pick-up to amp power supply interference.
  7. Does the sound get better or worse if you touch metal parts of the guitar with your hand? This may be a screening issue within the lead or the guitar itself.
  8. Try turning all the individual channel tone and gain controls to zero, turn off any effects on the amp panel. If that eliminates it only turn up the controls on channels that you are actually using.

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1 Answer

My swr workiongpro 15 suddenly has a very noticable hiss even when the amp is muted, and when I play the high end is more prominent than it was before.


If you are having the treble/high turned up there will be hiss. This is due to the statistical noise in electronics, including semiconductors. It is a matter of degree. The hiss should be 30 Db below your program level or so.

It is very common for one to change settings and suddenly start to notice hiss or hum at certain settings.

IF YOU CAN, go to a music store and COMPARE the amp to yours at the same setting with NOTHING plugged in. (cables and guitars can generate hiss or other noise themselves).

There is very little in your amp that would have changed to suddenly start generating hiss, so FIRST compare. This will minimize the chance of spending money at a shop to be told it is normal.

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1 Answer

Hiss in new fender frontman 65R. Can't seem to dial it out in either input.


A certain amount of "hiss" is present in electronic amps due to the statistical noise in electronics.

The hiss should be WELL below the level you get when playing. If you put you ear to the speaker, expect to hear some hiss with nothing plugged in. Ten feet away it should be very faint.

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