Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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I play Gibson USA Sgs, one with 490/498 humbuckers and one with 57classics....The Amp has a loud buzz like feedback all the time on the overdrive channel.

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If the amp is quiet with cables unplugged at the same settings as observing the buzz, the amp is OK.

In this case, cables and/or shielding and wiring in the guotar is suspect.

Guitar pickups are sensitive to magnetic fields and you can search out these fields by moving and orienting your guitar to find maximum buzz.

If the amp has objectional buzz with teh cables UNPLUGGED then the amp needs servicing. Filter capacitors among other things are suspect.

Posted on Sep 12, 2010

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Enter the serial number into this website and the information above will show! Happy guitar playing! http://www.guitardaterproject.org/gibson.aspx

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Hello! I've bought a Fender Rumble 75 about 3 months ago and it sounded great really but after some loud playing (About 75% of max volume) it started to buzz at midrange notes, and its gets worse as time...


Try plugging another sound source into the unit. The buzz MAY be pickup of magnetic fields in your guitar pickup that clobber your notes from the strings. Bad guitar cables are another possibility. By putting clean music from say a CD player into the unit you can find where the source is. If the CD player generates the same noises, then likely you have a failure of filter caps in the amp or other component failures. Also make sure your guitar can't "hear" the amp as feedback can do strange things.

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I have a Schecter C1+, older model. When played through a clean channel on my amp, Peavey 6505+, there is a constant buzz. Tried different guitars with the same amp/cab, an the buzz is gone. Culprit is...


This may be strictly magnetic pickup from nearby sources of transformers, ballasts or other motors that generate these magnetic fields. Humbucker pickups have hum cancelling windings that PARTIALLY remove the hum. Wires from pickups to other components should be twisted to help cancel the problem.

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Hi, my rare earth humbucker pickup has always worked fine but all of a sudden i get very quiet volume on both my maudio fast track ultra and my amp (orange cr35)...my amp has to be on overdrive to hear it...


Most likely problem is failing battery. Note that batteries have a habit of recovering when idle for a bit. Leaving guitar cable plugged in drains the battery as the presence of the cable is what turns on the preamp.

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Just got my fender 63 reverb reissue unit...and when i switch it on all i get is a loud buzzing hum type sound .


If you unplug the guitar cable and STILL get the hum, the unit has a defect... return under warranty.

If the hum goes away when you unplug the cable, replace the cable and see if new cable fixes the problem. If it does, the cable has a bad shield.

If the cable didn't cure it, then the guitar has a defect. Remember that some guitar pickups are sensitive to the magnetic fields from the amps... only cure is to either use humbucker types or be a distance away from the amp.

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Feedback noise when overdrive is on


it could be your guitar pickups. try using another guitar or getting your pickups waxed at your local music store. also if your playing in a small room kind of loud, or if your using single coil pickups (like fender statocaster pickups) you will definitely get a feedback noise. if that does not work let me know.

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1 Answer

Nothing but loud buzzing coming over the amp when trying to play. Any suggestions?


If the buzz disappears when you unplug the cable from the amp. check your cable.
If the buzz disappears when you unplug the cable from the instrument, there's something thay may have come loose inside the instrument.
If you unplug the cable from the amp., and the buzz persists, you'll have to have a competent tech. check your amp.

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Old yamaha electric guitar


Santana's had quite a few guitars, take your pick:
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1975 - Gibson SG Special with P90 pickup (Woodstock Festival)
1976 - Yamaha SG 175B / Gibson SG Special with 3 Open Coils
1982 - Paul Reed Smith (PRS) Custom
1988 - PRS Santana II with PRS Santana III nickel-plated pickups and .009-.042 D'Addario strings

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