(1) Tested RCA 8CM7 Tube with Box Date Code NI RCA Double Triode Tube

(1) Tested Strong RCA 9AU7 Tube with Box Date Code NF RCA 9AU7 Double Triode (b)

(1) Tested RCA 6KA8 Tube with Box Date Code GJ Triode Pentode Tube

(1) Tested Sylvania 6KE8 Tube with Box Date Code bd DHB Triode Pentode Tube

(1) Tested RCA 9AU7 Tube with Box Date Code BG RCA 9AU7 Double Triode Tube

(1) Tested RCA 6BR8A Tube with Box Date Code CB RCA Triode Pentode Tube

(1) Tested Strong RCA 8GN8 Tube with Box Date Code AV Triode Pentode Tube

(1) Tested RCA 6GH8A Tube with Box Date Code HE Triode Sharp Cutoff Pentode Tube