From The NY Times, Published: February 14, 1986: Sidney Stone, a vaudevillian and stage actor who was perhaps best known as the commercial announcer on Milton Berle's television series from 1948 to 1951, died of heart failure Wednesday in New York. He was 83 years old. Mr. Stone, who was born in New York, spent years in vaudeville, on the burlesque stage and in featured roles in such Broadway plays as ''Three Men on a Horse'' and ''Damn Yankees.'' Most recently, he performed for three years i