(!) (Single) 12AZ7A Tungsol gray plates “”O”” getter halo NOS 1960 era (8.4ma/9.0ma)

12AZ7A Tungsol gray plates “”O”” getter halo NOS 1960 era

8.4ma Gm=5000

9.0ma Gm=5200

McIntosh MC275

guitar amps – sub for 12AT7 or 12AY7