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

(1) Tested RCA 6AT6 Tube Date Code LQ Twin Diode High Mu Triode Tube

(1) Tested Sylvania 12AV6 Tube Date Code bh AUN 12AV6 Twin Diode High Mu Triode

(1) Tested Sylvania 6T8A Tube Date Code ab ESO Triple Diode High Mu Triode Tube

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

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

(1) Tested Philco 6AF4 Tube Date Code 57-52 Medium Mu Triode Tube Sylvania EIA

(1) Tested GE 12AT6 Tube with Box Code DE General Electric Twin Diode Triode