Mullard 12AX7A Blackburn Vacuum Tube 97%/83% (tested)

P le ase view photographs of the actual item for sale. Mullard 12AX7A. Triode 1: Gm 1300 micromhos 97%. Triode 2: Gm 1100 micromhos 83%. Production Site and Date Code: B9C3; B - Blackburn (Great Britain), 9 - 1969, C - March, 3 - 3rd week of the month.

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