HERE IS A NICE OF AMPEREX ECC83.12AX7 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 600 TESTER. ETCHED CODES ARE I65/^6C4 AND I65/^7B2. THESE ARE THE FAMOUS BUGLE BOY TUBES. BOTH HAVE HAMMOND LOGO. BOTH ARE HOLLAND MANUFACTURE. AUDIOPHILE GRADE 12AX7 TUBES. FREE U.S. SHIPPING.