Ayre / Aesthetix hum problems?

Charles, thanks a lot for your input, which I highly appreciate! I´ve checked polarity - o.k. All power cords (Electraglide Epiphany) are of the ground. My equippment is resting on Stillpoints and has got rose quarz and Shakti stones on it. The V-5xe is directly connected to a HMS wall socket.
I´ll try to audition a new K-5xe as I want to build a musical pleasing system around the V-5xe and my Ayon Seagull Ceramique speakers.
Does it degrade the sound quality if I would pair eg. the V-5xe with an unbalanced tube pre amp eg. CAT SL-1, ModWright SWL 9.0 SE or First Sound Presence DeLuxe? If so, in which degree?
Whith which tube amps have you/your customers achieved great results?

Just bought a new K-5xe and preferred it in some areas to the Aesthetix Calypso - which is of course a mighty fine product as well. By the way: NO hum problems with Ayre + Aesthetix.

I have a buddy I met here on A-gon who likes his Aesthetix Calypso so I thought I'd take a chance on one. If any of you who own the Ayre V-5xe and have had reservations (as I did) about hum issues with a Calypso, this problem has been solved. Thanks to Charles post above, I sent mine back for the 'M' upgrade. End result: no hum, no noise, no problems. The Calypso is just breaking in, but it seems to be a great match with the Ayre V-5xe and Ayre C-5xe. I'm happy as can be.