It most likely needs one or more power supply caps replsced. Not expensive! If you are handy with a soldering iron you can do it yourself.
Should I fix it and sell it or sell it as is? Mark Levinson No. 331
I have a Mark Levinson No. 331 that has developed a slight hum in the right channel. I am going to sell it, and the question is should I send it out for repair, which will cost in the neighborhood of $1100, or should I just put it on the market for around $800?