The GE JG-5814WA / 12AU7 tube is equivalent to the common 12AU7 tube
and European ECC82 tube. It can be used in any 12AU7 or ECC82 circuit. This batch of 5814-WA military tubes are from 1958 and come in original packaging from General Electric. They have grey plates and triple mica construction.
12AU7 Tube Types