(1) Tested Sylvania 6HB6 Tube with Box Date Code NR YAX Power Pentode Tube

(1) Tested Strong Sylvania 6JC8 Tube with Box Date Code NR ECW Triode Pentode

(1) Tested Sylvania 12F8 Tube with Box Date Code NR YAU Twin Diode Pentode

(1) Tested Sylvania 6JC8 Tube with Box Date Code NR EDF Triode Pentode Tube

(1) Tested Sylvania 5AQ5 Tube and Box Red Letters Date Code dc JEE Power Pentode

(1) Tested Sylvania 12JN8 Tube with Box Date Code NR AAA Triode Pentode Tube (b)

(1) Tested Sylvania 12JN8 Tube with Box Date Code NR AAA Triode Pentode Tube (a)

(1) Tested Sylvania 6CU5 with Box Date Code DED hh Black Plate Power Pentode