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

(1) Tested Sylvania 6BJ8 Tube with Box Date Code NR KAB Canada Twin Diode Triode

(1) Tested Strong Ken-Rad 12AT6 Tube Date Code 6-30 Twin Diode High Mu Triode

(1) Tested RCA 5T8 Tube with Box Code KP Triple Diode High Mu Triode Tube

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

(1) Tested GE 6BV8 Tube with Box Date Code SW General Electric 6BV8 Twin Diode

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

(1) Tested GE 6J6 Tube Date Code 56-22 General Electric Medium Mu Twin Triode