One of the original Ten-Tec founders, Jack Burchfield, K4JU has become a Silent Key:

Jack began his career with Electro-Voice in Buchanan as an acoustical engineer. In the late 1960s, he, along with Albert Kahn and Tom Mitchell, founded Ten-Tec, a manufacturer of amateur radio equipment in Sevierville, Tenn. Jack designed the initial line of products and most of the radio equipment that followed. His radios were on display at the Smithsonian Museum of American History for many years. He was an amateur radio enthusiast and was inducted into the Amateur Radio Hall of Fame in 2004.