(1) Tested Westinghouse 6KA8 Tube with Box Date Code 67-43 Triode Pentode Tube

(1) Tested Sylvania 6KA8 Tube with Box Date Code RAA Triode Pentode Tube

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

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

(1) Tested Ford Philco 6KA8 Tube with Box Japan Date Code 2L Triode Pentode (a)

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

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

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