(!!!) (Slightly microphonic Single) 12BH7A CBS Oval Black Plates "U" getter NOS 1960 era (8.4/9.0ma)

1 low noise slightly microphonic tube) 12BH7A CBS Oval Black Plates "U" getter NOS 1960 era

1 section) 9.0ma Gm=2500

1 section) 8.4ma Gm=2600 

- microphonic when tube is tapped on