(!!!) (Best Pair) 12B4A GE NOS 1960's (47ma and 48ma)

1 pair) 12B4A GE NOS 1960's same build
1 tube) 47ma Gm=7900 GE
1 tube) 48ma Gm=8100 GE Admiral

Matched on Amplitrex

Vplate=140

Vgrid=-15V

Good Ma range 25-40ma

Good Gm = 6000

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