(1) Tested RCA 6BH6 Tube Date Code BP RCA Sharp Cutoff Pentode Tube

(1) Tested Sylvania 6BH6 Tube with Box Date Code jm ARH Sharp Cutoff Pentode

(1) Tested Philco 6BH6 Tube with Box Sharp Cutoff Pentode Tube

(1) Tested RCA 3BC5 Tube with Box Date Code KQ Sharp Cutoff Pentode Tube

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

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

(1) Tested RCA 3CE5 Tube with Box Date Code MG Sharp Cutoff Pentode Tube (a)

(1) Tested Strong Sylvania 6BH6 Tube Date Code 013 AMC Sharp Cutoff Pentode Tube