6SN7GTB CBS black base black plates side-getter, the same shape as Sylvania 6SN7GTB used/good 1961 (7.5/8.0ma)

1 Low Noise tube) 6SN7GTB CBS black plates side-getter used/good 1961, the same plate shape as Sylvania 6SN7GTB  (7.5/8.0ma)