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

(1) Tested Silvertone 12BY7A Tube Date Code 69-39 Sharp Cutoff Pentode 12BY7 A

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

(1) Tested Truetone 6AC7 Tube with Box Code 517 Sharp Cut Off Pentode Tube

(1) Tested RCA 6HS6 Tube and Box Date Code NR Sharp Cutoff Twin Pentode Tube

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

(1) Tested RCA 6AU6 Tube Date Code 352 RCA 6AU6 Sharp Cut Off Pentode Tube

(1) Tested RCA 6CB6 Tube Date Code 504 Sharp Cut Off Pentode RCA 6CB6 Tube