(!!!) (Best Value Single) E80CF=7643 Valvo Germany branded International NOS 1961 (12.8/18mA) (PREMIUM 6BL8 SUB) (Tuners)

E80CF=7643 Valvo Germany branded International NOS 1961 (Triode/Pentode) 

1 tube) 12.8ma Gm=4800 and 18ma Gm=7700 

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