 6AQ5

The 6AQ5 (Mullard–Philips tube designation EL90) is a miniature 7-pin (B7G) audio power output beam tetrode vacuum tube with ratings virtually identical to the 6V6 at 250 V. It was commonly used as an output audio amplifier in tube TVs and radios.There are versions of this tube with extended ratings for industrial application which are designated as 6AQ5A (with controlled heater warm-up characteristic), and 6AQ5W/6005 or 6005W (shock and vibration resistant).