E80CF=7643 Valvo Germany branded Philips 1970 (11.4/9.0ma) Title: 7643

E80CF=7643 Valvo Germany branded Philips 1970 (Triode/Pentode)

triode) 11.4ma Gm=4500

pentode) 9.0ma Gm=5900

Good Triode section Ma and Gm = 10-13ma 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