HERE IS A VERY STRONG PAIR OF WASTINGHOUSE 7591 VACUUM TUBES. THESE TUBES BOTH TEST AT 100% FOR EMISSION WITH NO SHORTS OR GRID LEAKAGE. TESTED ON A B&K 500 TESTER.DATE 1962 AND 1966 DATE CODES. LARGE GRAY PLATES AND TOP MOUNTED HALO GETTERS. GREAT FOR YOUR VINTAGE AMP. DON'T MISS THESE!