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Fan noise - what is normal?

I bought a used Genzler mg800 from GC, and I have a schroeder PS212 cab (untested before this). I think what I'm hearing is the fan being amplified through the speakers. The volume is completely turned down on the Genzler. I've tried moving the head and a different outlet. Unfortunately, I don't have another head to test with, I'll probably have to bring it back to Guitar Center. Do you have any thoughts on what this could be?
 
If you bought it used, it might have been "modified" by somebody who read on the internet about upgraded quieter fans and created a new problem because a lot of these modifications create new (and sometimes very serious) problems.

Why don't you contact Jeff at Genzler and ask him about it?
 
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