(!) (Pair) 12B4A RCA NOS 1971-1974 (42ma and 36.5ma)
$ 19.99
1 matched pair) 12B4A RCA NOS 1971-1974
1 tube) 36.5ma Gm=6500
1 tube) 42.0ma Gm=7100
Matched on Amplitrex AT1000
(Vplate=140V, Vgrid=-15V, Good Iplate range 25-40ma)
Good Gm range 5500-7000
See more: vacuum tube
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 (Pair) 12B4A RCA NOS 1971-1974 (42ma and 36.5ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/3_11e4766c-cf81-43c3-8c0a-5599ff6b1f6a.jpg?v=1776113391){kind=link}
 (Pair) 12B4A RCA NOS 1971-1974 (42ma and 36.5ma) "Pin It")