valve, or 'diode'. "Tubes Vs. Transistors: Is There an Audible Difference?"—1972 AES paper on audible differences in sound quality between vacuum tubes and transistors. The cathode-ray tube site O'Neill's Electronic museum—vacuum tube museum Vacuum tubes for beginners—Japanese Version NJ7P Tube Database—Data manual for tubes used in North America. Vacuum tube data sheet locator Characteristics and datasheets Tuning eye tubes 1904 in science 1904 in technology Electrical components English inventions Glass applications Telecommunications-related introductions in 1904 Vacuum