6AQ5

Beam Power Pentode Audio Output Tube, capable of delivering up to 4.5 Watts of clean audio power output. Operating from a 6.3V heater, it handles the main acoustic driver stage in tabletop radios, guitar amplifiers, and television sound decks, acting as a compact 7-pin miniature equivalent to the larger 6V6 architecture, housed in a standard 7-pin miniature glass envelope (T-5.5 bulb).