(!!!) (Best Pair) 12B4A GE NOS 1960's (47ma and 48ma)
$ 21.99
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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 (Best Pair) 12B4A GE NOS 1960's (47ma and 48ma) "Pin It")