Bad noise from the amp

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Joined: 2008-12-28
Bad noise from the amp


I'm from Sweden so I hope you can understand my english. I got a Earth Sound Research 212 amp but I got some problems when it get hot, after about ten minutes I got a "squeeze sound" (I don't know how to describe the sound good) coming from the amp it's not constant sounding so the noise come and go. Has anyone some idea of what the problem could be, could it be the tubes in the poweramp that makes the noise or are the risk bigger that theres is something wrong with some components in the preamp?