NOS SYLVANIA USA 12AU7 ECC82 MATCHED PAIR AMPLITREX TESTED TUBES
NOS AUTHENTIC SYLVANIA USA Amplitrex AT1000 TESTED 12AU7A MATCHED PAIR. serving as a desirable ECC82 = 12AU7A tube; representing the best of its kind. 12AU7-A = ECC82 / ECC802S Quiet. TOP EMISSIONS! - HICKOK & AMPLITREX DIGITAL TESTED!