Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier
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Posted on Jan 02, 2017
One of the tubes COULD be microphonic.
Take back off and use a pencil to lightly tap each tube to see if one causes noise.
Posted on Sep 10, 2009
As an electronics tech for 40 years I have spent half of those years reparing the damage done to electronic equipment by WD40. It is a great product when used in the correct situation. When it comes to cleaning controls in amplifiers etc the correct procedure is to apply a contact cleaner to flush out any dirt then apply a contact lubricant. WD40 contains minute graphite particles as well as corrosive chemicals. Between the two they swiftly render the controls to the bin.
WD40 great for unlocking rusty screws etc but never use it in electronic gear.
Posted on Jun 01, 2010
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.
Posted on Mar 05, 2011
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