(!) (Pair) 12B4A RCA NOS 1966-1974 (31.5ma and 36.5ma)

1 matched pair) 12B4A RCA NOS 1966-1974

1 tube) 36.5ma Gm=6500

1 tube) 31.5ma Gm=6150

Matched on Amplitrex AT1000

(Vplate=140V, Vgrid=-15V, Good Iplate range 25-40ma)

Good Gm range 5500-7000