12SN7GT

Octal 8-pin medium-mu twin triode utilizing a 12.6-volt heater filament, structurally identical to the 6SN7GT and optimized for audio amplification, phase inverters, and computer switching. Equivalents: 12SN7, 12SN7GTA, B36, 12N8S. Real-Life Examples: Vintage jukebox audio preamplifiers, 12-volt mobile and marine radio gear, early experimental digital switching arrays.