PrimaLuna Prologue Premium vs Luxman SQ-N10 ?

I'm currently selling a PL Prologue Premium. The unit I have has low level hum. When I received from former dealer in New York (who swears he tried it "with every speaker in my shop and it didn't hum") I noticed the hum but thought it normal for mid-level tube equipment. So be sure to listen for hum in your unit.

@dweller Thanks for the word of caution. I've heard a number of folks saying the unit is dead quiet, so I'm wondering if your unit is defective. Is this hum present on all source selections? And does it sound like a ground hum or tube noise?

@dweller also, what speakers are you using? 

I have owned the PL Dialogue and now the Premium model and never heard a hum so I guess the unit was defective. I'm quite pleased with PL products since they are well built and sound great.

Let's us know your results with the comparison.

I used the PL Prologue Premium with KEF dynamic speakers and high efficiency Klipsch La Scallas. The hum is there in both cases although more pronounced with the Klipsch. The hum (60 hz I’m guessing) is constant, in both channels, and does not vary with volume or electrical circuit (yes, I've tried a cheater plug). It occurs on all inputs. If I had to guess, I’d say that some shielding was omitted during assembly. I’m planning to send to Upscale Audio for evaluation (unit is under warranty). I’ve heard from multiple PL owners who claim their units are dead quiet. I hope this is a fixable fluke.