(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)
$ 21.99
1 pair) 12B4A GE NOS 1960's - 1970's same build
1 tube) 30ma Gm=6600 GE
1 tube) 30.5ma Gm=6700 GE rebranded Raytheon
Matched on Amplitrex
Vplate=140
Vgrid=-15V
Good Ma range 25-40ma
Good Gm = 6000
See more: vacuum tube
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 (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_8b6d3db3-874a-4558-8c70-703d3f42fcf2.jpg?v=1734154514){kind=link}
 (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma) "Pin It")