RCA’s origins begin with the federal monopoly of radio signals after WW1. The Navy went to the General Electric Corporation and asked them to discontinue selling the company’s Alexanderson alternators, which were used in AM radio transmitters, to the British-owned Marconi Wireless Telegraph Company of America. This way General Electric could create an American-owned radio company that the Army and Navy would use. This marked the beginning of a series of negotiations where General Electric would buy the American Marconi Company, incorporate it, and rebrand it the Radio Corporation of America, or RCA. RCA was a major manufacturer of vacuum tubes like the RCA 6350 vintage tube and tube socket that can substitute for the 12au7. The RCA 6350 matched pair plate vintage audio tube and tube socket provide the gritty, distorted sounds of the sixties that were made to increase the loudness of musical notes for an amplifier and can substitute for the 12au7 matched pair plate vintage audio tube is a perfect throwback. Your search is over for a part that is able to fix your broken, worn out amps, allowing you to be content with your old equipment again. While some tube companies still produce glass amplifier tubes that substitute for the 12au7, audio tube quality may not be as good. Since it started in 1918, RCA has stood for high-quality, reliable products on which consumers rely on, that are able to substitute for the 12au7. Even though this is a new old-stock tube, the audio tube is just as durable and strong as when it was made circa 1960 and is a suitable replacement for the 12au7. You may be able to substitute across brands as well, such as adding a Sylvania tube, but you should check for computability before tinkering with your gear. The 6350 was produced in the United States and is ideal for more than just televisions and amateur radios. The 6350/12au7 vintage tube is also excellent for amplifiers and voltage readers. This 6350/12au7 vintage tube proves that newer is not always better, because it keeps electronics going for years. The black vacuum tube, or valve, is a device that controls electric current between electrodes in an evacuated container. Vacuum tubes rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. A phototube achieves electron emission through the photoelectric effect. The simplest dual vacuum tube, the diode, contains only a heater, a heated electron-emitting cathode, and plates. The triode current only flows in one direction through the device between the two electrodes as electrodes emitted by the cathode travel through the tube and are collected by the anode. One or more control grids within the tube allows the current between the cathode and anode to be controlled by the voltage on the grid. Other tubes are beam-powered tubes, gas-filled tubes, miniature tubes, and multi-section tubes. Batteries and AC power drive the electricity to the tubes.