(1) Tested RCA 6DT6 Tube Sharp Cut Off Pentode Tube

(1) Tested RCA 6AU6 Tube RCA Sharp Cut Off Pentode Vintage Tube (c)

(1) Tested RCA 6JV8 Tube with Box High Mu Triode Sharp Cutoff Pentode Tube

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

(1) Tested RCA 6CB6 Tube RCA Sharp Cut Off Pentode Tube (b)

(1) Tested RCA 6AU6 Tube RCA Sharp Cut Off Pentode Vintage Tube (b)

5CG8 RCA Medium-Mu Triode Sharp-Cutoff Pentode Vacuum Tube - NOS - TESTED

(1) Tested RCA 6BH11 Tube with Box Medium Mu Twin Triode Sharp Cutoff Pentode