6CG7/6FQ7

Miniature 9-pin general-purpose medium-mu twin triode designed with an internal shield between the two triode sections to ensure low noise and minimize cross-talk in audio and television circuits. Equivalents: 6FQ7, 6CG7, 6SN7GT (exact electrical equivalent on an octal base). Real-Life Examples: Vintage McIntosh and Marantz stereo power amplifiers, television horizontal oscillator stages, custom high-end preamps.