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

(1) Tested Strong Philco 6BC5 Tube Date Code 61-47 Sharp Cutoff Pentode Tube

(1) Tested Sylvania 3CF6 Tube Date Code RAA Sharp Cutoff Pentode Tube

(1) Tested Philco 6AU6 Tube Date Code 247 Philco 6AU6 Sharp Cut Off Pentode

(1) Tested Very Strong RCA 6GY6 Tube Date Code CT 6GY6 Sharp Cutoff Pentode Tube

(1) Tested RCA 12AU6 Tube with Box Date Code 443 Sharp Cutoff Pentode Tube

(1) Tested Philco 7AD7 Tube with Box Date Code U3 Power Pentode Loktal Tube

(1) Tested Zytron 6BC5 Tube with Box Date Code 56-20 Sharp Cutoff Pentode Tube