(1) Tested RCA 6AW8 Tube with Box Date Code BKP 6AW8 High Mu Triode Pentode

(1) Tested 1950 RCA 6SQ7 Tube with Box Metal Twin Diode High-Mu Triode Tube

(1) Tested RCA 6AT6 Tube with Box Date Code BF Twin Diode High Mu Triode Tube

(1) Tested Sylvania 6MD8 Tube with Box Date Code fd AJD Medium Mu Triple Triode

(1) Tested RCA 6CW4 Tube Nuvistor Tube with Box Date Code 039 High Mu Triode

(1) Tested Sylvania 3AV6 Tube with Box Date Code ACG Twin Diode High Mu Triode

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

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