(1) Tested RCA 5X8 Tube with Box Date Code KP Triode Pentode Tube

(1) Tested Sylvania 5X8 Tube Date Code GL ELM Triode Pentode Converter Tube

(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 Sylvania 6JZ8 Tube with Box Date Code hl AAO Medium Mu Triode Pentode

(1) Tested Sylvania 6JT8 Tube with Box Date Code LQ 6JT8 Triode Pentode Tube

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

(1) Tested Sylvania 6JC8 Tube with Box Date Code NR EDF Triode Pentode Tube