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

(1) Tested GE 6BA8A Tube Date Code 62-35 Medium Mu Triode Cutoff Pentode 6BA8 A

(1) Tested GE 6BA8A Tube Date Code 61-04 Medium Mu Triode Cutoff Pentode 6BA8 A

(1) Tested Philco 6JE8 Tube Date Code EBF High Mu Triode Sharp Cutoff Pentode

(1) Tested Sharp Japan 17JZ8 Tube Date Code 8-7 Medium Mu Triode Power Pentode

(1) Tested RCA 6BF6 Tube Date Code KG Twin Diode Medium Mu Triode Tube

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

(1) Tested RCA 6EB8 Tube Date Code AP High Mu Triode Pentode Tube