(1) Tested Sylvania 6JZ8 Tube with Box Date Code hl AAO Medium Mu Triode Pentode

(1) Tested Sears 8JV8 Tube Japan Date Code 6K High Mu Triode Cutoff Pentode

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

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

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

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

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

(1) Tested Sylvania 10GN8 Tube Date Code 1F High Mu Triode Sharp Cutoff Pentode