Technical manual in used, good condition for electronic products manufactured by Sylvania, a renowned electronics brand from the United States. 11th edition from 1959. Some wear to the front cover. Pages have some age toning. See photo. This vintage manual is perfect for those interested in vintage electronics and audio/video equipment. It contains valuable information and technical specifications on electronic vacuum tubes. For use in repairing and restoring vintage electronic equipment. With a focus on providing detailed information and technical specifications, it offers a wealth of knowledge for those interested in vintage electronics. Please email me with questions,Cheers!