(1) Tested 1956 GE 6BC5 Tube with Box Date Code 56-52 Sharp Cutoff Pentode Tube

(1) Tested Truetone 6BC5 Tube with Box Date Code 6517 Sharp Cutoff Pentode Tube

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

(1) Tested RCA 6EW6 Tube and Box Date Code DE RCA Sharp Cutoff Pentode Tube

(1) Tested Silvertone 6BC5 Tube Date Code 312 Sharp Cutoff Pentode Tube

(1) Tested National Union 6BC5 Tube Date Code 533 Sharp Cutoff Pentode Tube

(1) Tested Philco 6BC5 Tube Date Code 5311 Sharp Cutoff Pentode Tube

(1) Tested RCA 6GH8A Tube with Box Date Code HE Triode Sharp Cutoff Pentode Tube