I would not doubt Steve and Patrick's knowledge about amp construction-no disrespect to your tech, but they are the most 'stand-up' guys in the business. Call SMc and get the answer from the horse's (designer's) mouth.
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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?