6LU8 GE NOS 1979 (2.3/51ma)
$ 7.99
6LU8 GE NOS 1979 (FN) - triode section slightly low Gm
2.3ma Gm=2800
51ma Gm=8500
Tested on Amplitrex
section 1 triode) Good Ma=2ma, Good Gm=3000-3500
section 2 pentode) Good Ma=50-55 Good Gm=8000-9000
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