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

(1) Tested Garod 6AC7 Tube Date Code 0-09 Garod 6AC7 Sharp Cut Off Pentode (b)

(1) Tested Truetone 6AC7 Tube Date Code 248 Sharp Cut Off Pentode Tube

(1) Tested Westinghouse 6AC7 Tube Date Code 1-22 6AC7 Sharp Cut Off Pentode Tube

(1) Tested RCA 6AC7 Tube Date Code 352 RCA 6AC7 Sharp Cutoff Pentode Tube

(1) Tested Sylvania 12AU6 Tube with Box Date Code ha ACG Sharp Cutoff Pentode

(1) Tested Garod 6AC7 Tube Date Code 0-09 Garod 6AC7 Sharp Cut Off Pentode (a)

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