Hi Esther. The 3150 is a nice unit from everything I've read and judging from other NAD's I've heard. It's worth about $150 -- though it can show up for less. You may want to check to see how old it is, but it could be 20 years old -- that means that, to sound as it once did, some capacitors might have to be changed out. But even if it doesn't sound as good as it once did, if the NAD sounds good to you now, keep and enjoy it. For that kind of money, it would be hard to find something a lot better.
Here's a link to a thread on some used equipment that you might find helpful:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1090290740&read&keyw&zznad=3150
Here's a link to a thread on some used equipment that you might find helpful:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1090290740&read&keyw&zznad=3150