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

(1) Tested Westinghouse 3DT6 Tube with Box Date Code 63-43 Sharp Cutoff Pentode

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

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

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

(1) Tested RCA 6AG5 Tube with Box Date Code KH RCA Sharp Cutoff Pentode Tube