(!!!) (Best Value Single) E80CF=7643 Valvo Germany branded International NOS 1963 (10.8/13.4mA) (PREMIUM 6BL8 SUB) (Tuners)

E80CF=7643 Valvo Germany branded International NOS 1963 (Triode/Pentode)

1 tube) 10.8ma Gm=4600 and 13.4ma Gm=6300

Good Triode section Ma and Gm = 11-13ma Gm= 4500-5000

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

7643=E80CF is a “”SPECIAL QUALITY”” low noise medium-mu triode/pentode

Specs are similar to 6BL8=ECF80

– McIntosh MR-67 tuner