6SR7

Octal 8-pin duplex-diode triode combining two independent signal diodes with a medium-mu (mu=16) triode designed for detection and clean amplification of high-level audio signals. Equivalents: 6SR7GT, VT-233, CV1980, 6G1. Real-Life Examples: Hammond Solovox model J keyboard attachment, US Navy radio receivers (such as the RAL/RBM series), vintage jukebox preamplifiers.