General Electric "Five Star" 5814WA twin triode vacuum tube-ruggedized version of the 12AU7. This tube has the highly sought after triple mica construction to limit microphonics. Solid cross section match at 2822 and 2788 uMhos with baseline 1700 uMhos acceptable. Tested on Hickok AN/USM-118B tube tester. In original box with torn upper flap.