(!!) (BEST SINGLE) 6DN7 GE branded RCA NOS 1960's (64ma and 7.2ma)

1 tube) 6DN7 GE branded RCA NOS 1960 era (1 plate) black (1 plate) gray

64ma Gm=9000

7.2ma Gm=2200

Tested on Amplitrex

1 section) Good NOS Ma=35-40ma and Gm=7000-7700

1 section) Good NOS Ma=7-8ma and Gm=2200-2500

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