question for Luxman L-590AX owners

Here is another such product, about $150 :

https://avahifi.com/products/humdinger-dc-line-blocker


Of course, more expensive solutions are to use a balanced power transformer, which are themselves subject to mechanical hum without enhanced circuitry. :-)

I do want to point out that yes, any lights with little wall warts, especially those with built in dimmers, may introduce DC.  The best way to diagnose this is to turn off everything in the house except your amp and see if it goes away.  Then start flipping breakers back on until the hum reappears.

What happens is that these devices only take power from one side of the AC line, but not the other. This lack of symmetrical power draw causes DC to appear, and then the mechanical hum.

Best,

Erik

The hum issue seems to be fairly common with Luxman integrateds.  I have a 507ux and it also started humming a few years after I bought it.  The amp itself is dead quiet-no sound from the speakers-just from the unit itself.This issue has come up a few times online.  Some people say you need to tighten or put insulation under the transformers.  I have been meaning to write to Luxman about it but haven't gotten around to it since it is doesn't affect my actual listening experience.  Very disappointing though!The new Luxman distributor seems like a much more helpful guy than the previous one.  Hopefully they will offer some suggestions that don't involve Bulgarians.

Reports of Luxmans with hums go back at least five years, probably further.
https://forum.audiogon.com/discussions/luxman-class-a-integrated-slight-buzzing-noise/post?highlight=luxman%2Bhum&postid=78228#78228

Thanks, guys. Essentially, it's a near non-issue for me, other than the fact that I'm quite sure it never was there before. I'll do some more reading.

Now I can reasonably say my amp didn't originally have a hum. The original owner stated as much in the above link in twoleftears post.