NOS SYLVANIA USA 12AU7 6189 E82CC ECC802S MATCHED PAIR AMPLITREX TESTD TUBES
REAL NOS 12AU7-WA = E82CC. NOS AUTHENTIC Amplitrex AT1000 TESTED RCA 12AU7A MATCHED PAIR. ex·em·pla·ry RCA 6189 / 12AU7-WA PAIR. serving as a desirable 6189 = 12AU7-WA tube; representing the best of its kind.