1950's RCA USA 12AX7 ECC83 LONG-BLACK-PLATE D-GETTER MUSEUM CERTIFIED HOLY-GRAIL
12AX7 = ECC83. AUTHENTIC 1950's Amplitrex AT1000 TESTED RCA 12AX7 SINGLE TUBE. REAL N.O.S. RCA USA 12AX7. serving as a desirable ECC83 = 12AX7 tube; representing the best of its kind. [ 12AX7 ] REMAINS.