Televisions for sale, 1974
American Bandstand / 1950’s, 1960’s, 1970’s.
Videosphere TV set, 1970/71. Yokohama Plant Victor Company of Japan / JVC. Museum für Angewandte Kunst Köln, via RBA
If this had been an actual emergency, the attention signal you just heard would have been followed by official information, news or instructions.