JG-6189=12AU7WA GE triple mica NOS 1963 (8.6/10.4ma)

1 low noise tube) JG-6189=12AU7WA GE triple mica "O" getter halo NOS 1963 mil-grade in white box - pins cleaned and polished

8.6ma Gm=1800

10.4ma Gm=2100 

JG=mil-grade

12AU7 subsititute

5814A=12AU7 GE is also recommended