Why does New York radio station sond so good?

Klystron tubes are used primarily in television broadcasting, microwave transmission and radar. The modulation level from a Klystron would be too high for radio broadcasting.

I'd guess the station in question has a good, clean processing chain coupled with a modern stereo generator which minimizes multipath - particularly important in an urban environment. So much radio and TV broadcasting was done from the WTC that when stations rebuilt their transmission facilities, they were able to upgrade their technology to modern levels. Remember, there are many (many) transmitters that are still running smoothly after 40+ years of service, but their technology is somewhat antiquated.

You also need to check out 88.3, WBGO (jazz) and 90.7, WFUV (eclectic mix).

I agree with camadeco. Do not miss-out on WBGO 88.3. The best jazz.

While I do enjoy 96.3, I think that 93.9 (NPR station, music starts after 7 PM - Check out "New Sounds" program after 11 for tremandous variety of great music) sounds even better. More "Row F" than the "Row N" sound of 96.3, to me. Can't begin to guess why but check it out if you can.

And 88.3 is great for jazz but personally I cannot listen if certain (male) DJs are on.

There is so much wonderful music on this handful of NYC area stations.

I'm back home now, at least for a while, so can't check out the other suggestions, but thanks. I'll check them out next time I go back.

Interesting thoughts by Palasr. Their web site mentions that their antennas are on the Empire State Building. I don't know if they were on the WTC before. I sent them an email; I'll let you know if I hear anything back.