Well isn't this the 30 Anniversary of when WABC770 flipped from top 40 to Talk. I know in some of the NYC radio blogs they said that WABC770 went to talk in 1982. However there were other ABC O&O's that were already talk by the time that 770AM went to this operation. I know that KABC 790 was talk as far back as the 1960's or 1970's. I heard of Michael Jackson (LA Host) Moved from KNX-AM to KABC around the time KNX went all-news. I heard of KGO was news talk as far back as the 1960's or 1970's while WABC 770 was doing Top40. WABC back in the 1960's and 1970's were as comparable as the Drake RKO stations were in other parts of the country were.
http://www.youtube.com/watch?v=zvaxfYQl6dY
http://www.youtube.com/watch?v=72Y-Gj6ryXQ&feature=related
http://www.youtube.com/watch?v=zvaxfYQl6dY
http://www.youtube.com/watch?v=72Y-Gj6ryXQ&feature=related