guitar demon
Join date: Feb 2008
91 IQ
Marshall fx100. I know its shit but its all I got. Didn't give me any trouble before. I sit, turn it on, and immediately an incredibly loud squeal. Turned all the knobs down and still, he second I turn it on my ears bleed. What the **** happened?
"funny" but "unmemorable"
Join date: Apr 2006
153 IQ
Are you using a speaker cable? Also try vacuuming/blowing compressed air into the fan on the back.

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Registered User
Join date: Mar 2011
210 IQ
So even when you turn all the gain down, but have the volume up the amp starts feeding back?
2011 Gibson Honeyburst LP Trad. w/ SD Whole Lotta Humbuckers
2014 Gibson Ocean Water Standard Plus
Marshall Haze 15W Head/Cab
Hughes & Kettner Tubemeister 5
5150 III Enthusiast
Join date: May 2008
233 IQ
Did you check to see if your cables were loose? Or if they have some bad connections that was possible connecting the hot and ground connections together for whatever reason.