12AU7 ECC82 BLACK-PLATE "D-GETTER" MUSEUM CERTIFIED HOLY-GRAIL PAIR 1955 RCA USA
12AU7 = ECC82. serving as a desirable ECC82 = 12AU7 tube; representing the best of its kind. AUTHENTIC 1955 Amplitrex AT1000 TESTED RCA 12AU7 MATCHED PAIR TUBES. REAL 1955 N.O.S. RCA USA 12AU7. REAL NOS 1955 RCA BLACK-PLATE 12AU7 PAIR.