RCA 6FJ7 Electron Vacuum Tube Plug In 12 Pin Cylindrical Glass Body Twin Triode

The RCA 6FJ7 Electron Vacuum Tube is a plug-in, 12-pin compactron twin-triode vacuum tube housed in a cylindrical glass envelope. It contains two independent triode sections in one envelope, designed for dual-triode amplification in vintage equipment that uses a Compactron-based socket. The base is a 12-pin Compactron configuration, enabling plug-in compatibility with sockets used in mid-20th-century television and audio gear. Some references describe the 6FJ7 as the Compactron-base twin-triode equivalent of the 6DN7, clarifying its dual-triode topology within a single package. Certain dealer listings identify the tube as new old stock, reflecting its vintage origin. This RCA tube is of interest to restorers seeking authentic components for tube amplifiers or vintage televisions that require a 12-pin dual-triode in a cylindrical glass form factor.