Luxman Class A Integrated Slight Buzzing Noise

My Luxman 590ax amplifier has a very, very low hum but you cannot hear it unless you put your ear on top of the unit. My 590ax is connected to the Furutech e-TP80 that conditions the ac power only. See: http://www.furutech.com/2013/01/31/1537/

Based on the above posts, I believe there might be something in your environment that is causing your Luxman 550ax class A amplifier to hum.

I suggest you contact the Audiogon person you purchased the Luxman 550ax from. Did the unit hum for this person? If not, ask him to describe their environment to see what the differences are.

What power cord are you using? I suggest you try the stock power cord or another power cord. I suggest you connect the power cord directly to the wall. I owned another product (not Luxman) that would not power on correctly if I used a non-stock power cord. The unit worked perfectly using the stock power cord plugged directly into the wall.

You might also try a cheater plug. This link includes some useful info about amplifier hum and the use of a cheater plug. See:

http://forums.stevehoffman.tv/threads/cheater-plug-is-a-godsend-for-reducing-hum.11443/

It is possible one of your other audio units needs the cheater plug and not the Luxman? Does the Luxman hum if you move it to another room (away from your audio system)? It is possible something else (maybe a light) in your listening area needs the cheater plug?

I suggest you turn off all appliances and lights (within reason) and see what happens. You might consider calling a Luxman dealer and ask their opinion.

If you still hear a hum, can you live with it? If not, please contact Philip O’Hanlon at On Higher Note. He is the US Distributer and is very knowledgable with Luxman products.

http://onahighernote.com/support/

Unfortunately, it is going to take some time to determine the cause and find a solution. Please keep us posted.

Deedo: I understand and agree with your points above. My suggestions above were the only things I could think of that might help solve the hum problem. However, the fact that your Luxman 590AX can be heard up to "8 feet away" is, in my opinion, a very "serious problem".

If my Luxman 590ax hummed (like yours does) so that I could hear it 8 feet away, I would return the unit to my dealer and buy another amplifier (not Luxman). Based on your 590ax humming problems, maybe your Luxman 590ax needs to be returned for repairs. What is your dealer saying? Can you return the unit to your dealer and buy something else?

I have owned other high end equipment before that, unfortunately, had problems that I could not live with. In all cases, I returned the unit to my dealer and bought something else.

As a happy owner of a Luxman 590ax, that does not hum, it really bothers me that your 590ax hums. If my 590ax had a hum (like yours), I would return it and buy something else.

I would also call Philip O'Hanlon and discuss the humming issue with him. Based on this tread, it seems other 590ax units also have a hum. A solution is required (repair or return).

When my Ayre QB-9 DSD DAC stopped working, I immediately returned it to dealer who shipped it to Ayre for repairs (bad board to board connector).

Deedo: I just noticed you purchased the 590ax from another Audiogon member. Did the 590ax hum for this person?