(!!) (SINGLE) E80CF=7643 Telefunken Germany <> bottom NOS Gold Pins with warranty sheet 1965 (13.0/11.4ma) (6BL8 sub)

1 tube) E80CF=7643 Telefunken Germany <> bottom NOS Gold Pins with warranty sheet 1965

triode) 13.0ma Gm=5000

pentode) 11.4ma Gm=6700

Good Triode section Ma and Gm = 12-13ma Gm= 4500-5000

Good Pentode section Ma and Gm = 9-11ma Gm = 6000-6500

(The E80CF is a “”SPECIAL QUALITY”” medium-mu triode/pentode. Specs are similar to 6BL8=ECF80)

– McIntosh MR-67 tuner