(1) Tested Raytheon 6BR8A 6FV8A Tube Japan Date Code H10 Triode Pentode Tube

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

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

(1) Tested Strong Sylvania 6JC8 Tube Date Code NR JAG Triode Pentode Tube

(1) Tested Westinghouse 6JW8 Tube Date Code 81-09 Triode Tube Pentode Tube (a)

(1) Tested Motorola 6DX8 Tube Date Code 7M-1584 Japan Triode Pentode Tube

(1) Tested RCA 6JV8 Tube and Box Date Code BZ Triode Pentode Tube (b)

(1) Tested GE 6X8 Tube with Box Date Code 61-22 Triode Pentode Converter Tube