(1) Tested RCA 35DZ8 Tube with Box Date Code MI High Mu Triode Power Pentode

(1) Tested RCA 60FX5 Tube with Box Date Code BB RCA Power Pentode Tube

(1) Tested RCA 3AU6 Tube with Box Date Code FB Sharp Cutoff Pentode (a)

(1) Tested RCA 5AN8 Tube with Box Date Code KQ Triode Pentode Tube

(1) Tested RCA 6AU8 Tube with Box Date Code KQ Triode Pentode Tube

(1) Tested RCA 5X8 Tube with Box Date Code KP Triode Pentode Tube

(1) Tested RCA 6JV8 Tube and Box Date Code BZ Triode Pentode Tube (b)

(1) Tested RCA 6AK6 Tube and Box Date Code NHK Power Amplifier Pentode Tube (c)