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

(1) Tested Raytheon 6HS8 Tube with Box Japan Code J-16 Sharp Cutoff Twin Pentode

(1) Tested GE 6HS8 Tube with Box Date Code FE Sharp Cutoff Twin Pentode Tube

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

(1) Tested Zenith 12BY7A Tube Date Code 026 Sharp Cutoff Pentode 12BY7 A Tube

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

(1) Tested Admiral 6AU6 Tube Date Code 8-13 RCA EIA 6AU6 Sharp Cut Off Pentode

(1) Tested Magnavox 6EW6 Tube Date Code 3-26 Sharp Cutoff Pentode Tube