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

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

(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

(1) Tested RCA 6AU6 Tube Date Code 504 RCA 6AU6 Sharp Cut Off Pentode Tube

(1) Tested Magnavox 6EW6 Tube Date Code 235 Japan Sharp Cutoff Pentode Tube