(!!!!) (Best Value Pair) EC92=6AB4 Telefunken Germany <> bottom NOS 1964-1965 (7.3ma and 7.0ma) (same Gm) (mic)

1 Pair) EC92=6AB4 Telefunken Germany <> bottom NOS 1964-1965 good printing

1 tube) 7.3ma Gm=4600

1 tube) 7.0ma Gm=4600

Tested on Amplitrex AT1000

Vplate=250V

Good Iplate range 7-12ma

Gm=4500-5000+