M mxr2000 Well-known member Joined Mar 17, 2007 Messages 265 Reaction score 1 Dec 22, 2007 #1 I was playing with my mark iv combo and then first heard this howling sound and then later started to sound like a mosquito even if the amp volume is turn all the way up. what you think is going on?
I was playing with my mark iv combo and then first heard this howling sound and then later started to sound like a mosquito even if the amp volume is turn all the way up. what you think is going on?
B Boogiebabies Well-known member Joined Jan 30, 2005 Messages 4,578 Reaction score 21 Location Korn's Bakery Brooklyn NY Dec 22, 2007 #2 Bad preamp tube.
