Question about Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier

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Bad Humm Out - Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier

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First disconnect all inputs. If hum is still there, PROBABLY the filter capacitors have gone bad. Replacement is the cure.

IF there is no hum without any inpout cable connected, there is a ground loop and either the ground at the inout connector is broken, or your cables and guitar may have a problem.

Posted on Nov 15, 2009

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What is causing humming sound in headphones?


Well, there are a couple things in the troubleshooting process you may want to check first. If Possible,
1. Have you tried a different pair of headphones thru the same jack?, Is it buzzing as well? Then its not the headphones. If the buzzing stops with a different pair, then we proceed to to headphones in question.

so , headphones are buzzing. Both sides? if yes , or even 1-side, then yes, it is a ground issue. can you expose the wiring at the input jack?
Basically, you want to put an ohm meter on each wire and independently check each wire for continuity. check for any breaks in the line, and or check to see if a wire is crossing over to ground via a break. so check each line to itself, then each line to each other.
if you fo not understand on the process of using an ohm meter? you can go to this You Tube link and it will give you a general understanding.
hopefully this gives you a little insight? If not?, ask the question again, and also include the make & model of the headphone set. that always helps;m Thanks,
Good luck.!!

Mar 22, 2016 | Music

2 Answers

Speaker humms only. what causes that?


Incorrect connections or volume settings.

• In powering up, mixer first then amp

• In turning off , amp first then mixer


If hum still persist, without the mixer connected

then speaker amp may need servicing.

Jul 31, 2012 | Samson Auro D415A Speaker PA Active

1 Answer

Noisy outputs on the korg tr


If this unit is running on a wall wart power adapter, it is possible that the adapter is NOT the correct one. Make sure it is the orginal adapter for the unit. A lot of Korg stuff requires adapters with more filtering or regulation. So called "Universal" adapters usually will NOT work. Please specify your model number as "TR" doesn't compute.

Jul 15, 2012 | Music

1 Answer

Hum when mixer is turned on


If it is a 60Hz or 120 hz hum, the fault may be a bad solder connection to a filter capacitor in the power supply.

If it is a hum like a bad mic connection, you may have dirty contacts on an input, dirty tracks on a mixer control, even on the EQ portion.

It may also be a bad cable is connected, or a 1/4 inch jacked input may not be grounding out when the plug is removed. You may have a bad ground on the power feed and you have a ground loop as a result, or a cable is faulty and creating it's pwn ground loop to something else.

Contact cleaner is not a bad idea, slide pots are notorious for spurious noise over time. LPS1 is not bad, but it does use silicone as the dry lubricant portion.

If all of that is ruled out, look internally for bad solder joints- anything that looks crumbly is suspect, and also check for loose wires and jacks with bad solder connections. Also look for loose connectors too.

Mar 29, 2012 | Mackie 3204VLZ3 32-Channel USB Mixer

2 Answers

When standby is turned on a loud humm then fuse blows


Replace diodes CR6 through CR9 and test C31 and C33 for short. If all OK and fuse still blows, remove the power tubes and test. Hopefully you do not have a transformer short.

To save fuses, put a 150 watt light bulb in series to act as a reseting fuse while testing.

Feb 01, 2011 | Fender Hot Rod Deluxe Guitar Combo...

2 Answers

Loud humm when the drive channel is on


I suspect the power supply has an issue. Most likely bad filter capacitors. This could cause "motorboating" where power is drawn and supply voltage collapses and then recovers repeatedly.

Time for the repair shop. The parts cost should be nominal... labor... well...

Mar 15, 2010 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

Marshall VS65R is powered up it hums


Blown speaker NO (would not get sound at all)

Bad Reverb UNLIKELY (controls would deselect reverb and it would be out of circuit)

Bad preamp tube NO (controls have no effect)

Bad rectifier and/or filter caps LIKELY

Bad power amp POSSIBLE

Nov 29, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

Washburn guitar mg-20 pick up switch position 5 neck pick up no sound or noise humm or anything. all other positions and configurations work?


if everything is standard on that guitar then the only reason that pick up wouldnt work is because its a defective pick up or a wire is disconnected. it may also be possible that the selector switch is bad. take a small screw driver and tap the pick-ups in all positions while plugged in to the guitar amp and the volumes up ( not all the way) just loud enough that you can hear the tapping. you find the bad pick up when you cant hear the tapping with that pick up selected.

Feb 22, 2009 | Washburn Music

2 Answers

PEAVEY ECOUSTIC 112 W/ NO SOUND ----muted?


then i'm afraid that your main board has a glitch that you can't repair. take it to a music shop they have the neccessary parts to repair this problem and they have the schematics that will show them which chip is faulty. i'm not sure how long you have had this amp but over time the heat causes the chips or tubes to fail. that is the best answer i can give you at this time anything else would just be a gues and a waste of time. good luck

Aug 31, 2008 | Music

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