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(!) (#1 12B4A RCA Pair) 12B4A RCA NOS 1960's - 1970 same build (56.5ma and 57.5ma)

(!) (#1 12B4A RCA Pair) 12B4A RCA NOS 1960's - 1970 same build (56.5ma and 57.5ma)

$ 15.99

1 matched pair) 12B4A RCA NOS 1960's - 1970 same build

1 tube) 56.5ma Gm=7900 pins cleaned

1 tube) 57.5ma Gm=7900

Matched on Amplitrex

Vplate=140

Vgrid=-15V

Good Ma range 25-40ma

Good Gm = 6000

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