(!) (Recommended Pair) 12B4A RCA NOS 1969-1971 (42ma and 47ma)
$ 21.99
1 matched pair) 12B4A RCA NOS 1969-1971
1 tube) 42ma Gm=7100
1 tube) 47ma Gm=7500
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 RCA NOS 1969-1971 (42ma and 47ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/6_df4ab8ab-a0a1-4917-afb6-d9850eb3448f.jpg?v=1791353433){kind=link}
 (Recommended Pair) 12B4A RCA NOS 1969-1971 (42ma and 47ma) "Pin It")