(1) Tested Admiral 8FQ7 Tube Date Code 270-17 Japan Medium Mu Twin Triode Tube

(1) Tested Philco 6JE8 Tube Date Code EBF High Mu Triode Sharp Cutoff Pentode

(1) Tested RCA 6AU8 Tube Medium Mu Triode Sharp Cut Off Pentode Tube

(1) Tested Relay 6CX8 Tube Date Code 6-66 Medium Mu Triode Pentode Tube

(1) Tested Philco Japan 6LU8 Tube Date Code 4H High Mu Triode Beam Power Tube

(1) Tested GE 6BA8A Tube Date Code 62-35 Medium Mu Triode Cutoff Pentode 6BA8 A

(1) Tested GE 6BA8A Tube Date Code 61-04 Medium Mu Triode Cutoff Pentode 6BA8 A

(1) Tested Zenith 6KA8 Tube Date Code 72-17 Great Britain Triode Pentode Tube