(1) Tested Zenith 10GN8 Tube High Mu Triode Sharp Cutoff Pentode Tube

(1) Tested Strong Sylvania 6JC8 Tube Date Code NR JAG Triode Pentode Tube

(1) Tested Sylvania 6GH8A Tube with Box Date Code ae Triode Sharp Cutoff Pentode

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

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

(1) Tested RCA 6JE8 Tube with Box Code AV High Mu Triode Sharp Cutoff Pentode

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

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