(!) 12AT7 RCA black plates NOS D getter halo 1950's, slightly microphonic (13/16.4ma) (high Ma and Gm)

1 tube slightly microphonic) 12AT7 RCA black plates NOS D getter halo, red printing, LV date code, 1950's in white box

1 section) 13.0ma Gm=6100

1 section) 16.4ma Gm=6800

Good Ma range 8-10ma

Good Gm range 4500-5500

small amount of microphonics when glass is tapped

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