Season 1 NBC , 1947 - 1948 Season 2 NBC , 1948 - 1949 Season 3 NBC , 1949 - 1950 Season 4 NBC , 1950 - 1951 Season 5 NBC , 1951 - 1952 Season 6 NBC , 1952 - 1953 Season 7 NBC , 1953 - 1954 Season 8 NBC , 1954 - 1955 Season 9 NBC , 1955 - 1956 Season 10 NBC , 1956 - 1957 Season 11 NBC , 1957 - 1958