(1) Tested Strong RCA 6GY6 Tube with Box Date Code DD Sharp Cutoff Pentode Tube

(1) Tested RCA 3CE5 Tube with Box Date Code MI Sharp Cutoff Pentode Tube (b)

(1) Tested Lindal 6GH8A Tube with Box Japan Code 448 Triode Sharp Pentode (a)

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

(1) Tested Zenith 6GH8A Tube Date Code 18-09 Halo Getter Triode Cutoff Pentode

(1) Tested Lindal 6GH8A Tube with Original Box Triode Sharp Cutoff Pentode

(1) Tested Lindal 6GH8A Tube Japan Code 448 Triode Sharp Cutoff Pentode (b)

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