I have a new GK MB210 II and just recently played it long enough and loud enough for the fan in the amp to go on. I was surprised how noisy it was. Of course no one can hear it over the band playing but it is noticeable.
My GK MBF does the same thing. I read where this get's under some folks skin, but since it cant be heard while playing, or even between songs at a gig, what's the issue? Never bothered me, YMMV.
