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

(1) Tested Zenith 6GH8A Tube Date Code 18-09 Halo Getter Triode Cutoff Pentode

(1) Tested Sylvania 6BH6 Tube with Box Date Code jm ARH Sharp Cutoff Pentode

(1) Tested RCA 6HS8 Tube with Box Date Code BV Sharp Cutoff Twin Pentode Tube

(1) Tested Sylvania 12JN8 Tube with Box Date Code ZAB Triode Pentode Tube

(1) Tested Zenith 6KT8 Tube with Box Code 439 Sylvania EIA Triode Pentode Tube

(1) Tested Sylvania 6CU8 Tube and Box Code am YAD Triode Pentode Vacuum Tube (b)

(1) Tested RCA 6AZ8 Tube with Box Date Code KG Medium Mu Triode Cutoff Pentode