Audio Research Refernce 75se

System was really high end all around . @ghasley 

you can hear the noise clearly coming out of the amp

its small buzz/hum , even can say sound a bit metallic .

Probably why the party in question wants to sell it. ARC is subject to as many problems as any other brand but cost x times more to repair.  No practical experience, just my impression to what is written here.  

Next someone who has had no problems will chime in and say otherwise, and that's ok.

@mike30 what I was getting at is that you dont have enough data. Ive owned this amp on multiple occasions, it shouldnt have noise. What power treatment were they using? Was the amp plugged into the wall? What about the circuit? What kind of power cable? Is it a dedicated or shared circuit? Shared power strip with switched mode devices?

you really should utilize the dealer channel. You think it will cost you more but it will save you money in the long run.

http://ibb.co/gVwpVMK

Transformer buzz! If it's not too obtrusive you can live with it! ARC might charge a lot for a new transformer.