HERE IS A VERY STRONG PAIR OF SYLVANIA 12AX7 VACUUM TUBES. THESE TUBES BOTH TEST EXCELLENT AT 100% FOR EMISSION ON BOTH TRIODES WITH NO SHORTS OR GRID LEAKAGE. TESTED ON A B&K TESTER. EARLY 60'S TUBES. RED AND YELLOW SYLVANIA LOGOS. LARGE GRAY PLATES AND TOP MOUNTED HALO GETTERS. GOOD STRONG TUBES. FREE U.S SHIPPING.