(2) Sylvania JAN-12AX7WA Military Spec Preamp Tubes | Gray Plates | O Getters. Tube 1 tests at 52/54 and tube 2 at 46/50 with 32 being the minimum score for a good tube (with 65% life remaining).
(2) Sylvania JAN-12AX7WA Military Spec Preamp Tubes | Gray Plates | O Getters. Tube 1 tests at 52/54 and tube 2 at 46/50 with 32 being the minimum score for a good tube (with 65% life remaining).