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

(1) Tested RCA 6AU8 Tube Medium Mu Triode Sharp Cut Off Pentode Tube

(1) Tested RCA 6BA8A Tube Date Code NR Medium Mu Triode Cutoff Pentode 6BA8 A

(1) Tested RCA 6BH11 Tube with Box Medium Mu Twin Triode Sharp Cutoff Pentode

(1) Tested RCA 5BR8 Tube with Box Date Code AQ Medium Mu Triode Cutoff Pentode

(1) Tested Very Strong RCA 6AG9 Tube RCA Medium Mu Triode Sharp Cutoff Pentode

5CG8 RCA Medium-Mu Triode Sharp-Cutoff Pentode Vacuum Tube - NOS - TESTED

(1) Tested Zenith 6KT8 Tube High Mu Triode Sharp Cutoff Pentode Tube