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1 pair) 12B4A GE NOS 1962-1970
1 tube) 36ma Gm=6950 (GE) 1962
1 tube) 36ma Gm=6850 (GE) 1970
Matched on Amplitrex
Vplate=140V
Vgrid=-15V
Good mA range 25-40ma
Good Gm = 6000