(1) Tested Philco 6ES5 Tube Date Code BBC High Mu Triode Tube

(1) Tested Sylvania 5CL8A Tube Date Code da AGD Medium Mu Triode Sharp Tetrode

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

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

(1) Tested Sylvania Type 27 Tube Date Code 13R Medium Mu Triode Tube

(1) Tested Philco 6AT6 Tube Date Code 50-13 Dual Diode High Mu Triode Tube

(1) Tested Sylvania 2AF4B Tube Date Code XY Medium Mu Triode Tube

(1) Tested RCA 6AN4 Tube Date Code KJ RCA High Mu Triode Tube