Humming on new Conrad Johnson MF2200


I just received a "new" CJ ML2200. I hooked it up to my Luxman R117 receiver (for now) and it hums like mad. Is this normal (I hope not), do I need to change something, or is the amp defective?
Thanks
eugkim

Showing 1 response by eugkim

Thanks for the responses - especially Craig. The amp does have a barely perceptible hum by itself, but the noise through the speakers stopped when I used the cheater plug. Incidently, I bought it used - hence the "new" in my post.