(!!!!) (Best Overall Pair) EC92=6AB4 Telefunken Germany <> bottom NOS 1965 same date codes (9.2/9.5ma) (mic)

1 matched pair) EC92=6AB4 Telefunken Germany <> bottom NOS 1965 same date codes

1 tube) 9.2ma Gm=4900

1 tube) 9.5ma Gm=5100

Matched on Amplitrex AT1000

Vplate=250V

Good Iplate range 7-12ma

Gm=4500-5000+