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

(1) Tested Tung-Sol 12AV6 Tube Tung Sol 12AV6 Twin Diode High Mu Triode Tube

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

(1) Tested GE 3AV6 Tube with Box Date Code 61-17 Twin Diode High Mu Triode

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

(1) Tested Meck 12AT6 Tube Date Code 8-22 GE EIA Code Twin Diode High Mu Triode

(1) Tested Silvertone 18FY6 Tube Twin Diode High Mu Triode Tube

(1) Tested RCA 6BF6 Tube Date Code KG Twin Diode Medium Mu Triode Tube