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McCormack DNA 500 loud hum

So I just picked up a McCormack DNA 500 and the damn thing just hums loudly in one channel when coupled with my cyrus preamp.  I took it in and the tech said it's because the rcas aren't grounded as they enter the same Jensen transformers as the balanced connection, this can result in really bad humming.  He's going to ground them but I just can't believe that I can't run this amp stock with my cyrus preamp?  That preamp shouldn't have any problems with this amp.  Any one have detailed knowledge of these a,ps that can guide me or my technician?

malthuse

Showing 1 response by mofimadness

mofimadness's avatar
mofimadness
5,479 posts
 
I also recommend calling or emailing Steve, (he's actually on here sometimes).  

I've known Steve since way back in the Mod Squad days.  He's a great guy and wouldn't design a product that had problems.  I think it might be something else within the interactions of your system.  If this was a problem from the design, I would think it would have raised it's ugly head by now.

I've owned a few of his products and never had any problems.
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