(1) Tested GE 5X8 Tube with Box Date Code FV General Electric Triode Pentode

(1) Tested RCA 5AN8 Tube with Box Date Code KQ Triode Pentode Tube

(1) Tested GE 5AN8 Tube with Box Date Code 59-04 General Electric Triode Pentode

(1) Tested RCA 6AU8 Tube with Box Date Code KQ Triode Pentode Tube

(1) Tested RCA 5CG8 Tube with Box Date Code KR Triode Pentode Tube

(1) Tested RCA 6BH8 Tube with Box Date Code BZ 6BH8 Triode Pentode Tube

(1) Tested GE 6KA8 Tube with Box Great Britain Date Code HI Triode Pentode

(1) Tested RCA 6AZ8 Tube with Box Date Code KG Medium Mu Triode Cutoff Pentode