It certainly seems to be an anachronism that KYW Newsradio still uses that teletype sound in this computer age. But hey, doubtless KYW has some research suggesting people subliminally associate the station with that sound! Interesting, the other "K" news station in Pennsylvania, KQV 1410, also uses teletype (not to mention the original newsradio sounders... the last time I heard!)
Whether Action News on Channel 6 or KYW Newsradio in Philadelphia, it seems Philly programmers tend to stay with the adage, "If it ain't broke, don't fix it!"
...which makes sense, unless you compare KYW to Washington's WTOP, which has become a dominant station with many, many innovations. (The move to a great FM signal didn't hurt either!) Then again, the Mormons - LDS church - behind Bonneville International, which owns WTOP, lacked the usual corporate stockholder pressure, and had a vision.
One other point, Chicago's WBBM Newsradio - for many years - actually aired teletype noise live. A microphone was once installed in WBBM's wire closet, for the incoming AP, UPI, Reuters, and City News wires! A note on the glass door advised people NOT to talk loudly, let alone swear, near that wire room!
WBBM, like a number of the once CBS O & O news stations, gave up teletype ambience some time ago.
Merry Christmas to everyone who reads this board!