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

RCA 6BZ6 Vintage Vacuum Tube Pentode Electron Valve USA Made - Tested

RCA 6AU8A TRIODE/PENTODE VACUUM TUBE ~ NOS, TESTED

6DX8/ECL84 GE Triode-Pentode Vacuum Tube - NOS - TESTED

Zenith 6BZ6 Miniature Semi-Remote-Cutoff Pentode Vacuum Tube

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

(1) Tested Zenith 10JT8 Tube Noval Base 9 Pin Miniature Triode Pentode Tube

Vacuum Tube, 12BY7A, Zenith, NOS, Sharp-Cutoff Pentode, Tested Hickok 752A