question for Luxman L-590AX owners


I own the subject amp, have had it for 3-4 years. I recently noticed a low hum or buzz coming from the amp itself (not the speakers), and would swear that it has been dead quiet up until now. You have to have your head right down beside it to hear it. I'd like to hear what other owners have to say. Are your amps completely quiet? Seems like I may have developed an issue. Thanks in advance, and Merry Christmas.
builder3
Interesting thread. Have never heard of this issue with reference to the current version L590axii, but since that amp is on my radar I’d like to know in advance if that model is also susceptible. 

Anyone know if Luxman corrected the issue with release of the L590axii, or does the hum issue arise there as well?
I used to own the 590AX2 and it was dead quiet. But my unit was new and I sold it after a few months to go to tubes, but still one of my favorite Integrated.
kren, I went and dug up the original receipt for my amp. I'm the 3rd owner, but I have the paperwork. My amp is 5½ years old, and I'm pretty sure this just started. You'd have to hear it for yourself, but I can only hear it with my ear down next to the unit when I turn it on. Still irks me a bit, since it used to not be there. On the newer MkII, who knows? Maybe in 5 years, it may show up in some pieces, I don't know. Personally, if I auditioned the piece and liked it, I wouldn't let it be a deal breaker. Hope this helps.
Wow, I'm an idiot, lol. Hadn't read that entire thread that twoleftears linked, just did look at everything, the last post on it was mine from two years ago, good grief.
But OP the thread title is for L590AX, not the Mk II version that I’m asking about.

Or are you saying you have the L590AXii. ???

Edit: sorry didn’t read closely enough your last post. I guess you are saying you have the original version (not mk ii ). Got it thx