The 1950s GE Electronic Tubes Essential Characteristics General Electric Tube Manual is a vintage spiral-bound booklet published by General Electric in 1954. The manual, authored by the General Electric Electronics Department, is a historical nonfiction piece that serves as a technical reference for technicians, engineers, and collectors interested in electronic tubes from the 1950s era. Filled with technical specifications and diagrams, this manual provides valuable insights into the essential characteristics of receiving types of electronic tubes, making it a valuable addition to any collection focused on vintage electronics.