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

(1) Tested RCA 6AG5 Tube Date Code LS RCA Sharp Cutoff Pentode Tube

(1) Tested RCA 3DT6A Tube with Box Date Code BM Sharp Cutoff Pentode Tube

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

(1) Tested Sylvania 6EW6 Tube Date Code 548 Sharp Cutoff Pentode Tube

(1) Tested Silvertone 6BC5 Tube Date Code 312 Sharp Cutoff Pentode Tube