Nitrobattery
Well-known member
I've been having some problems with my Mark IV. When I crank it up, it squeals uncontrollably. Even when I turn the gain way down it still feeds back like crazy. Does anyone know what the problem could be? I always change my tubes long before they really need to be changed so I don't have much experience with tube failure. I bought the Mark IV used so I don't know how long it has been since it was retubed. Other than the noise problem I’m in love with this amp. I’m actually even thinking about selling my Dual Recto because I never use it anymore. Any help would be really appreciated.