The PHILIPS 5814A (12AU7A) before 1980 labelled Sylvania, is a US mil.spec version of the 12AU7 of highest quality and reliability standard.
The 5814A is an excellent mil.grade audio-tube to upgrade any ECC82./ 12AU7; originally designed for military requirements.
aka E82CC, 12AU7A, 6189 double triode
Note: Identical tube can be supplied printed Philips as well as Sylvania
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