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Preamp tubes

 
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(!!!) (Best Pair) 12B4A GE NOS 1960's (47ma and 48ma)

(!!!) (Best Pair) 12B4A GE NOS 1960's (47ma and 48ma)

$ 21.99
(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)

(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)

$ 21.99
(!) (Pair) 12B4A GE NOS 1960's (37ma and 38.5ma)

(!) (Pair) 12B4A GE NOS 1960's (37ma and 38.5ma)

$ 21.99
(!) (Recommended Pair) 12B4A Sylvania NOS 1960's (26ma and 27ma)

(!) (Recommended Pair) 12B4A Sylvania NOS 1960's (26ma and 27ma)

$ 19.99
(!!!) (Best Pair) 12B4A GE NOS 1962-1977 same build (52ma and 53ma)

(!!!) (Best Pair) 12B4A GE NOS 1962-1977 same build (52ma and 53ma)

$ 21.99
(!!!!) (Pair) 12B4A GE NOS rebranded Raytheon and RCA 1960's (35ma and 37.5ma) (same Gm)

(!!!!) (Pair) 12B4A GE NOS rebranded Raytheon and RCA 1960's (35ma and 37.5ma) (same Gm)

$ 20.99
12B4A Sylvania NOS 1960's (33ma)

12B4A Sylvania NOS 1960's (33ma)

$ 8.99
12B4A RCA NOS 1960's (31.5ma)

12B4A RCA NOS 1960's (31.5ma)

$ 7.99
(!!) (Recommended Pair) 12B4A GE NOS 1962-1970 (36ma and 36ma)

(!!) (Recommended Pair) 12B4A GE NOS 1962-1970 (36ma and 36ma)

$ 21.99
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