Chuck...I would call ARC and make sure it's ok to run the Ref 40 without turning on the power amp. I believe tube amps like to see a load (i.e. speakers) when they are on. Not sure whether this holds true for the preamplifier as well. If yes, then you should have your amp on and speakers connected when running the Ref 40. Better to confirm with ARC than be sorry. Just a thought.
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