question for Luxman L-590AX owners

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

So the OP has the mk1 version of the L-509X. Just to clarify that my L-590AXII does not show any hum. Very silent and no issues whatsoever except that it automatically shuts down by itself, occasionally, after prolonged listening sessions at moderate to high volume levels. Guess the protection circuit feature of the amp is working fine which is a good thing!

Nothing here is about the L-509X, which is an entirely different piece.
I own the L-590AX. There's no version that was ever called a MkI, throwing weird names in the mix won't help clarify anything.
On a side note, I'm inclined to think that your amp shutting down is indicative of a problem that needs addressed. Do you have plenty of room around the amp? They need to have good ventilation.